Re: [Tutor] look back comprehensively

[Asokan Pichai]

On Mon, Dec 24, 2018 at 5:16 AM Mats Wichmann  wrote:

> On 11/14/18 3:01 PM, Steven D'Aprano wrote:
> > On Tue, Nov 13, 2018 at 11:59:24PM -0500, Avi Gross wrote:
> >> I have been thinking about the thread we have had where the job seemed
> to be
> >> to read in a log file and if some string was found, process the line
> before
> >> it and generate some report. Is that generally correct?
> >
> > If that description is correct, then the solution is trivial: iterate
> > over the file, line by line, keeping the previous line:
> >
> > previous_line = None
> > for current_line in file:
> > process(current_line, previous_line)
> > previous_line = current_line
> >
>

The classic COBOL programmers idiom :-)

That said, sometimes text processing at the shell can precede or even
replace some of these. Of course that assumes Unix/Linux OS.

In this speciic case grep with its -B option can be used to generate a file
that contains only the lines of interest.

HTH

Asokan Pichai
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Re: [Tutor] A required question

[Asokan Pichai]

On Sat, Nov 24, 2018, 14:33 Avi Gross  David,
>
> As I suspected. Yes, I am aware how to do those things. Just wondered if
> anyone automated the process so a fairly simple interface worked.
>
Does the requirements.txt file (associated with pip IIRC) does most of what
you want?

>
> I am dropping the request.
>
> Avi
>
> -Original Message-
> From: Tutor  On Behalf Of
> David Rock
> Sent: Friday, November 23, 2018 9:28 PM
> To: Tutor Python 
> Subject: Re: [Tutor] A required question
>
>
> > On Nov 23, 2018, at 09:35, Alan Gauld via Tutor 
> wrote:
> >
> > On 23/11/2018 05:34, Avi Gross wrote:
> >> What I was thinking was the ability to do something like this:
> >>
> >> import ReChoir as require
> >>
> >> require.version(condition, before=True, after=False)
> >> require.modules(module list, recursive=True) require.os([“Eunuchs”,
> >> “Windblows”])
> >> require.functionality(“print3”)
> >
> > I can see the logic but suspect discussion of new features is probably
> > the preserve of the main Python list. If you can get traction there
> > somebody might actually go ahead and write one!
>
> discussion of a “require” library probably isn’t necessary.  It’s pretty
> straightforward to include the logic using existing methods.
>
> For the version of python, test against sys.version_info For the modules,
> put your import calls in a try block and handle exceptions For the OS
> version, test against os.name or sys.platform The last one,
> “functionality,” is a bit vague.  Probably another candidate for a try
> block.
>
>
> —
> David Rock
> da...@graniteweb.com
>
>
>
>
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Re: [Tutor] Recommended Python Compiler

[Asokan Pichai]

For a simple beginners editor -- geany is a great choice.

It can be used with minimal or no configuration/set up; and once
you know your way around  you can tweak it as much as you want.

It is easily installable on Debian/Ubuntu


-- 
Asokan Pichai
*---*
We will find a way. Or, make one. (Hannibal)
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Re: [Tutor] noob python question

[Asokan Pichai]

Can you retype the question and your code?

On 26 October 2015 at 04:46, bob5487 <evolution5...@gmail.com> wrote:

> Howdy!
>
> Reading *Learn Python the Hard Way* Zed Shaw
>
> All good so far but got to Ex 42 dealing with classes...
>
> I get a TypeError: getattr(): attribute name must be a string when I run
> the
> program...
>
> I looked online, python reference manual 3rd edition, etc...
>
> I was wondering if anyone has experience with this book because I hit a
> road
> block
>
>
>
>
>
> --
> View this message in context:
> http://python.6.x6.nabble.com/noob-python-question-tp5174789.html
> Sent from the Python - tutor mailing list archive at Nabble.com.
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-- 
Asokan Pichai
*---*
We will find a way. Or, make one. (Hannibal)

*To find everything profound — that is an inconvenient trait.* It makes one
strain one's eyes all the time, and in the end one finds more than one
might have wished. -- Nietzsche
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Re: [Tutor] list comprehension with else

[Asokan Pichai]

On Sun, Jan 18, 2015 at 6:50 PM, Sydney Shall s.sh...@virginmedia.com
wrote:

 I am a beginner and I have a question of syntax.

Welcome!



 I am just learning to use list comprehension, which oc course, I find very
 helpful indeed.

 However, I am stuck with a specific problem of how to incorporate an else
 in a list comp-rehension. I cannot do it.

 The following snippet of code does what I need. But, perhaps I am solving
 this math error problem incorrectly.
 The problem is I am occasionally getting exactly zeros when I need to
 obtain the logarithm of the number.

 for i in range(len(cap)):

Using a for loop like this is generally a poor idea.

for aCap in cap:

is the more pythonic way. And also will help you translate to a list
comprehension easily



 if cap[i] == 0.0:
 tmp = math.log(1.0)
 lncap.append(tmp)

Possibly lncap.append(math.log(1.0)) or even lncap.append(0) is simpler


 else:
 lncap.append(math.log(cap[i]))


Having said that above your present code, let me try to explain the thought
process behind constructing the list comprehension for your purpose. It is
possible that what you need is not an else in the list comprehension

lncap = [ f(aCap) for aCap in cap]

will be the starting point;  where f() will need to provide either
math.log(aCap) or 0 as we saw earlier.

You can actually write an auxiliary function f that does just that; like say
def f(p):
  if p == 0.0:
  return 0.0
  return math.log(p)

Or write the list comprehension as:

lncap = [ (math.log(aCap) if aCap  0 else 0.0) for aCap in cap]

Hope this helps
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Re: [Tutor] most useful ide

[Asokan Pichai]

On Sun, Feb 2, 2014 at 1:55 PM, Ian D dux...@hotmail.com wrote:

 Hi

 Are there any recommendations for python ide's


 currently I am using idle, which seems pretty decent but am open to any
 suggestions
 cheers


While not an IDE in the usual sense I have found IPython a great addition
to my toolkit.
YMMV

  Asokan Pichai
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Re: [Tutor] Fwd: What's in a name?

[Asokan Pichai]

On Fri, Jan 03, 2014 at 02:45:04AM -0500, Keith Winston wrote:
 And to beat that poor horse in the same example, my current way of doing
 that would be:
 
 for alist in lista, listb:
 print(alist, eval(alist))

Since you know both pieces, namely the name of the entity alist and its 
actual symbol aka alist, why not do something like:

Lists = {lista: lista, listb: lisb}

and use
Lists[x] ...

HTH

Asokan Pichai

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Re: [Tutor] Converting integers into digit sum (Python 3.3.0)

[Asokan Pichai]

On Tue, Dec 10, 2013 at 3:09 PM, Rafael Knuth rafael.kn...@gmail.comwrote:

 Hej there,

  I don't know if everyone would consider this more elegant but it's
  certainly shorter:

 Thanks!

  def DigitSum(YourNumber):
  ... return sum(map(int, YourNumber))
  ...
  DigitSum('55')
  10

 I don't understand yet what the map function does - can you explain?
 I read the Python 3.3.0 documentation on that topic but I frankly
 didn't really understand it
 http://docs.python.org/3/library/functions.html#map. My search for
 simple code examples using map wasn't really fruitful either.

 Other than that, I went through each of the 7 alternatives to my
 Integer to Digit Sum program you guys sent me, I understand what
 each of those programs does. My favorite one is:

 def DigSum (integer):
 s = 0
 while integer != 0:
 integer, remainder = divmod(integer, 10)
 s += remainder
 print(s)

 DigSum(537)

 It's really a beautiful, elegant solution IMHO and way better than my
 original code (convert int to string, store each digit in an empty
 list, then convert them back to int and sum them).

 If you liked it, I will give you one that uses one less variable :-)

def digitSum(n):
  dsum = 0
  while n  0:
dsum += n % 10
n /= 10
  return dsum


 Again, thank you all!

You are welcome.


Asokan Pichai

So, if I look into my foggy crystal ball at the future of computing
science education, I overwhelmingly see the depressing picture of Business
as usual. The universities will continue to lack the courage to teach hard
science, they will continue to misguide the students, and each next stage
of infantilization of the curriculum will be hailed as educational
progress.

Edsger W Dijkstra in Dec 1988, in an article titled on the cruelty of
really teaching Computer Science Link:
http://www.cs.utexas.edu/~EWD/transcriptions/EWD10xx/EWD1036.html
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Re: [Tutor] Converting integers into digit sum (Python 3.3.0)

[Asokan Pichai]

On Tue, Dec 10, 2013 at 4:06 PM, Asokan Pichai paso...@talentsprint.comwrote:




 On Tue, Dec 10, 2013 at 3:09 PM, Rafael Knuth rafael.kn...@gmail.comwrote:

 Hej there,

  I don't know if everyone would consider this more elegant but it's
  certainly shorter:

 Thanks!

  def DigitSum(YourNumber):
  ... return sum(map(int, YourNumber))
  ...
  DigitSum('55')
  10

 I don't understand yet what the map function does - can you explain?
 I read the Python 3.3.0 documentation on that topic but I frankly
 didn't really understand it
 http://docs.python.org/3/library/functions.html#map. My search for
 simple code examples using map wasn't really fruitful either.

 Other than that, I went through each of the 7 alternatives to my
 Integer to Digit Sum program you guys sent me, I understand what
 each of those programs does. My favorite one is:

 def DigSum (integer):
 s = 0
 while integer != 0:
 integer, remainder = divmod(integer, 10)
 s += remainder
 print(s)

 DigSum(537)

 It's really a beautiful, elegant solution IMHO and way better than my
 original code (convert int to string, store each digit in an empty
 list, then convert them back to int and sum them).

 If you liked it, I will give you one that uses one less variable :-)

 def digitSum(n):
   dsum = 0
   while n  0:
 dsum += n % 10
 n /= 10
   return dsum


 Again, thank you all!

 You are welcome.


 Asokan Pichai

 So, if I look into my foggy crystal ball at the future of computing
 science education, I overwhelmingly see the depressing picture of Business
 as usual. The universities will continue to lack the courage to teach hard
 science, they will continue to misguide the students, and each next stage
 of infantilization of the curriculum will be hailed as educational
 progress.

 Edsger W Dijkstra in Dec 1988, in an article titled on the cruelty of
 really teaching Computer Science Link:
 http://www.cs.utexas.edu/~EWD/transcriptions/EWD10xx/EWD1036.html


Stupid of me not to have mentioned that this Python 2.x only. Sorry
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Re: [Tutor] Converting integers into digit sum (Python 3.3.0)

[Asokan Pichai]

On Mon, Dec 9, 2013 at 1:38 PM, Rafael Knuth rafael.kn...@gmail.com wrote:

 Hej there,

 I wrote a program that converts an integer into a digit sum:

 def DigitSum(YourNumber):
 DigitList = []
 YourNumber = str(YourNumber)
 for i in YourNumber:
 DigitList.append(int(i))
 print(sum(DigitList))

 DigitSum(55)

 
 10

 It actually works but I was wondering if that's the only way to solve
 the task of converting an integer into a digit sum?  I learned from
 past conversations on this mailing list that often times there is a
 better, more elegant and shorter way to write a program, and I was
 wondering if that's the case here.


Why extract the digit and then store it and then sum it?

def digitSum(n):
 return sum([int(digit) for digit in str(n)])

Or
def num2Digits(n):
  return [int(ch) for ch in str(n)]
def digitSum(n):
 return sum(num2Digits(n))


Asokan Pichai

So, if I look into my foggy crystal ball at the future of computing
science education, I overwhelmingly see the depressing picture of Business
as usual. The universities will continue to lack the courage to teach hard
science, they will continue to misguide the students, and each next stage
of infantilization of the curriculum will be hailed as educational
progress.

Edsger W Dijkstra in Dec 1988, in an article titled on the cruelty of
really teaching Computer Science Link:
http://www.cs.utexas.edu/~EWD/transcriptions/EWD10xx/EWD1036.html
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Re: [Tutor] how to iterate through a dictionary and assign list values?

[Asokan Pichai]

On Thu, Dec 5, 2013 at 9:43 AM, Jared Nielsen nielsen.ja...@gmail.comwrote:

 I want to create a dictionary, assign it keys, then iterate through a for
 loop and assign the dictionary values from a list. I'm trying this, but
 it's not working:

 dictionary = {one, two, three}

This creates a set. and NOT a dictionary. Please remember that a dictionary
is (unordered) iterable collection of key-value pairs.

To initialise a dictionary and give it values you have to do
dictionary = { key1:value1, key2:value2} .


 list = [1,2,3]

 for key in dictionary:
 for value in list:
 dictionary[key] = value

 I get this error:
 TypeError: 'set' object does not support item assignment

Now I hope the error message makes sense.

What am I doing wrong? Any help is greatly appreciated.

I am not trying to tell you what to do as that would greatly depend on what
you are trying to do. But

d = {key:value for key, value in zip(keys, values)}

and

d = dict(zip(keys, values))

are worth studying.

Asokan Pichai

So, if I look into my foggy crystal ball at the future of computing
science education, I overwhelmingly see the depressing picture of Business
as usual. The universities will continue to lack the courage to teach hard
science, they will continue to misguide the students, and each next stage
of infantilization of the curriculum will be hailed as educational
progress.

Edsger W Dijkstra in Dec 1988, in an article titled on the cruelty of
really teaching Computer Science Link:
http://www.cs.utexas.edu/~EWD/transcriptions/EWD10xx/EWD1036.html
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Re: [Tutor] Off Topic re: unichr not working as expected

[Asokan Pichai]

On Wed, Jul 24, 2013 at 1:50 AM, Steven D'Aprano st...@pearwood.infowrote:

 On 24/07/13 04:53, Jim Mooney wrote:

 On 23 July 2013 07:28, Steven D'Aprano st...@pearwood.info wrote:


 (I trust that everyone remembers enough high school chemistry to
 understand why Mercurial is called hg? Hg is the chemical symbol for
 Mercury.)


 And I recall my high school chemistry teacher claiming the noble gases
 could never combine, until someone just decided to cook  up some Xenon
 Tetraflouride. Always fun when you get to contradict your teacher in
 class,
 and you're right - wel it was then. I'm a tad more mature, now - sometimes
 ;')


Way offtopic: It is Xenon Hexa Flouride IIRC. LOve that book 107 stories
about CHemistry

Asokan Pichai

Expecting the world to treat you fairly because you are a good person is a
little like expecting the bull to not attack you because you are a
vegetarian
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Re: [Tutor] Regarding python function arguments

[Asokan Pichai]

On Tue, Jun 11, 2013 at 2:24 PM, Arijit Ukil arijit.u...@tcs.com wrote:

 i am writing following python function:

 def my_func (arg1, arg2, arg3):


 however, I am not always going to pass all the arguments. sometimes only
 arg1 is passed, sometimes arg1 and arg2 are passed; sometimes arg1, arg2,
 arg3 are passed.
 How can i manage this?


Look at keyword arguments:
http://docs.python.org/release/1.5.1p1/tut/keywordArgs.html


BTW, don't you think that the signature attached by your organization is
rather
unsuitable for this list. For example, do I need an explicit disclaimer
from you
that you are not sharing company confidential information, if you post
a solution?

Asokan Pichai

Expecting the world to treat you fairly because you are a good person is a
little like expecting the bull to not attack you because you are a
vegetarian
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Re: [Tutor] producing PDF files

[Asokan Pichai]

On Tue, Jun 11, 2013 at 3:23 PM, Khalid Al-Ghamdi emailkg...@gmail.comwrote:

 Hi,

 Do you know of a python module for converting text files to PDF format?

 thanks

Reportlab
http://www.reportlab.com/software/opensource/

sphinx
http://sphinx-doc.org/ is  a great choice too.

Asokan Pichai

Expecting the world to treat you fairly because you are a good person is a
little like expecting the bull to not attack you because you are a
vegetarian



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Re: [Tutor] Issue w/ program: Flip a coin and count heads and tails

[Asokan Pichai]

On Fri, May 24, 2013 at 4:31 PM, Rafael Knuth rafael.kn...@gmail.comwrote:

 Hello,

 I am writing a program in Python 3.3.0 which flips a coin 10 x times and
 then counts the number of heads and tails. It obviously does something else
 than I intended, and I am wondering what I did wrong:


What is that you intended?
Please explain that.


 import random

 print (

 This program flips a coin 10 times.

Actually this is wrong. The program does something else.



 It then counts the number of heads and tails.

 )

 flips = 0

 heads = 0

 tails = 0

 while flips  10:

 flips = flips + 1

 if random.randint(1,2) == 1:

 heads = heads + 1

 print(We've got  + str(heads) +  heads here.

 if random.randint(1,2) == 2:

 tails = tails + 1

 print(We've got  + str(tails) +  tails here.)


 This is what I get as output:

 This program flips a coin 10 times.

 It then counts the number of heads and tails.

 We've got 1 tails here.

 We've got 1 heads here.

 We've got 2 tails here.

 We've got 2 heads here.

 We've got 3 tails here.

 We've got 3 heads here.

 We've got 4 tails here.

 We've got 5 tails here.

 We've got 4 heads here.

 We've got 6 tails here.

 We've got 7 tails here.

 We've got 5 heads here.

Is this an actual output??? Did the program stop here at 5 heads and 7
tails?



 Can anyone help?

 Thank you so much!

 All the best,

 Rafael


Asokan Pichai

Expecting the world to treat you fairly because you are a good person is a
little like expecting the bull to not attack you because you are a
vegetarian
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Re: [Tutor] Issue w/ program: Flip a coin and count heads and tails

[Asokan Pichai]

On Fri, May 24, 2013 at 4:54 PM, Rafael Knuth rafael.kn...@gmail.comwrote:

  I am writing a program in Python 3.3.0 which flips a coin 10 x times and
 then counts the number of heads and tails. It obviously does something else
 than I intended, and I am wondering what I did wrong:


 What is that you intended?
 Please explain that.

 I want that program to flip a coin 10 x times and then count the number of
 heads and tails.
 That's very much it.


Then you have set up the while loop right. It loops 10 times.
But if it is a head you are counting heads. Now if it is a tail
you are discarding and tossing again!

That is the effect of
while flips  10:
flips = flips + 1
if random.randint(1,2) == 1:
 - if it is not head?
heads = heads + 1
print(We've got  + str(heads) +  heads here.
if random.randint(1,2) == 2:
 - this is the second toss I am talking about
tails = tails + 1

Now if you replace the second toss by an else and count it as a tail
you should go towards the code you are looking for. Try it and tell us
how it goes. All the best

Asokan Pichai
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Re: [Tutor] Running python from windows command prompt

[Asokan Pichai]

On Thu, Apr 11, 2013 at 11:38 AM, Arijit Ukil arijit.u...@tcs.com wrote:

 Thanks for the help. Now I have modifed the code as:

 import sys

 def main(argv):

 data = int(sys.argv[1])

 avg = average (data)

 print Average:, avg

 def average(num_list):
 return sum(num_list)/len(num_list)

 if __name__ == __main__:
main(sys.argv[1:])



Two major problems:
One:
The __main__ methods processes (correctly) the args and drops argv[0]

But your main() function is calling sys.argv again

Two:
sum() and len() expect a list -- more accurately an iterable.
when you say
 data = argv[1]
data is a scalar.

If you know of list comprehensions, it can be easier or else,
think of a function to convert a list of strings (argv[1:] to a list
of floats; more general than int)


def arg2list(arg):
  args = []
  for a in arg:
   args.append(float(a))
  return args

Now replace the data = line with

data = arg2list(argv) # NOT sys.argv

HTH

Asokan Pichai

Expecting the world to treat you fairly because you are a good person is a
little like expecting the bull to not attack you because you are a
vegetarian
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Re: [Tutor] Please Help

[Asokan Pichai]

On Fri, Mar 22, 2013 at 6:07 PM, Arijit Ukil arijit.u...@tcs.com wrote:

 I have the following data points.
 data = [1,2,0,9,0,1,4]
 I like to store in an array and print the odd-indexed points, i.e. 2, 9,1
 (considering index starts at 0)

 *I have written the following code which is** not **running:*

 import math

 number_list = [1,2,0,9,0,1,4]

 number_list_1 = []
 for k in range(math.floor(float(len(number_list)/2))):
 if (k math.floor(float(len(number_list)/2))):
 number_list_1[k] = number_list[k*2 + 1]

 print *'data: '*, number_list_1

 Please help

 Regards,



I would suggest that your roblems have more to do with insufficient
understanding of basic constructs, and
that you should work on them, Learn Python the hard way a book by Zed
Shaw is a good one.

Why do I say that? Among other things,

k math.floor(float(len(number_list)/2))

is very poor in any language.

Asokan Pichai

The root of all superstition is that men observe when a thing hits, but not
when it misses. -- Francis Bacon
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Re: [Tutor] How to change the char in string for Python

[Asokan Pichai]

On Feb 24, 2013 4:27 PM, Sudo Nohup sudo.no...@gmail.com wrote:

 Dear all,

 I want to change the value of a char in a string for Python. However, It
seems that = does not work.

 Could you help me? Thanks!

 str = abcd
 result = [char = 'a' for char in str if char == 'c']


 OR:

 str = 'abcd'
 for char in str:
 if char == 'a':
char = 'c'


 OR:

 str = 'abcd'
 for i in range(len(str)):
 if str[i] == 'a':
str[i] = 'c'

 (
 Traceback (most recent call last):
   File stdin, line 3, in module
 TypeError: 'str' object does not support item assignment
 )

Look up string replace function.
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Re: [Tutor] Please help

[Asokan Pichai]

I saw the code;

I see too many formatting errors:
Line No 24 starts a function definition and the
next few lines are indented by two spaces, but
Line 29 is a print statement that is in line with
the def; IOW it completes the function. It is
very likely wrong.

You are defining functions within functions;
again it is very likely to be wrong.

My advice, look at PEP 8 and also some
sample python code in the tutorial to
understand how to format code. Remember:
Leading whitespace is syntactically significant

HTH


Asokan Pichai

Religion offers hope against all the strife and misery of
the world caused by religions.
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Re: [Tutor] Beginner's question

[Asokan Pichai]

How about this?
# Assumption x, y, z are all  0
x, y, z =
a = x * (x % 2)
b = y * (y % 2)
c = z * (z % 2)
big = a
if big  b:
   big = b
if big  c
   big = c

if big == 0:
   print No odd number
else:
   print big, is biggest odd number


Asokan Pichai

If a language is designed for non-programmers, soon only
non-programs get written in it. --- Anonymouse
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Re: [Tutor] help with homework

[Asokan Pichai]

[SNIPPED]

 Always use a while loop in this situation,

This is excellent advice. Use a for loop in two
situations:
 1. Iterating a fixed(known) number of times
 2. Iterating through the contents of any container

Use a while loop to iterate as long as a condition applies.


 regardless of whether or not
 teachers put stupid artificial constraints on your code,

 such as banning the use of len().

There may be legitimate learning outcomes for a teacher
to specify such conditions.
In this case, learning to use a counter that is incremented
under certain conditions. I would hesitate to condemn in
such strong terms without knowing more background.

Asokan Pichai
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Re: [Tutor] help with homework

[Asokan Pichai]

On Mon, Oct 29, 2012 at 2:28 PM, Alan Gauld alan.ga...@btinternet.com wrote:
 On 29/10/12 08:37, Asokan Pichai wrote:

 teachers put stupid artificial constraints on your code,

 

 such as banning the use of len().


 There may be legitimate learning outcomes for a teacher
 to specify such conditions.


 In that case they should think up a scenario that requires the use of the
 construct that is most appropriate. Teachers should never encourage bad
 practice(*) and that's what this example does.

 It's valid to put constraints such as do not use any external
 modules or to use a specific construct if that's what's being taught.
 But it's never right to leave the student the freedom to use any solution
 *except* the one that is most logical and readily available.


 In this case, learning to use a counter that is incremented
 under certain conditions.


 But there are many better cases where that solution is needed rather than
 using len(). This one just sounds like lazy teaching.

 (*) Actually enforcing bad practice one to demonstrate the problems
 can be valid provided its followed immediately by the best practice
 alternative.

As a trainer, I believe using a bad example is WRONG; even to teach
how not to write. Better to critique the suggested bad answers and
explain why that is bad, rather than enforce a constraint that leads
to a bad way and then call it out as bad explain why.

That said, it *is* preferable IMO, not use such strong condemnation
without knowing full background.

Probably by now this is OT, so I should stop now.

Asokan Pichai

If a language is designed for non-programmers, soon only
non-programs get written in it. --- Anonymouse
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Re: [Tutor] For - if - else loop; print selective output

[Asokan Pichai]

On Wed, Oct 24, 2012 at 09:27:30PM +0500, Saad Javed wrote:
 Hi,
 
 a = [['jimmy', '25', 'pancakes'], ['tom', '23', 'brownies'], ['harry',
 '21', 'cookies']]
 for i in a:
 if (i[1] == '25' or i[1] == '26'):
 print 'yes'
 else:
 print 'Not found'
 
 This prints:
 yes
 not found
 
 I want it to print yes for each positive match but nothing for a negative
 match. However if all matches are negative, I want it to print Not found
 once (That bit the code already does). I do I get it to print yes only in
 a mix result situation?
 
 Saad

I am sure you have some answer(s) already. I wanted to add a different solution

a = [['jimmy', '25', 'pancakes'], ['tom', '23', 'brownies'], ['harry', '21', 
'cookies']]
matches = [ i[1] in ('25', '26') for i in a ] ]
if not any(matches):
  print Not found
else:
for match in matches:
if match:
   print Yes


Asokan Pichai

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Re: [Tutor] rounding up to the nearest multiple of 8

[Asokan Pichai]

If you are doing so many times, it may be worth precomputing the padding for a
given length and adding it by a look up on the length.

For example:

SPACE = ' '
MAX = 1000
TAB = 8
paddding = [ SPACE * (n % TAB) for n in range(MAX) ]

.
s = padding[len(s)] + s
.
--
where s is string to be padded

Asokan Pichai

If a language is designed for non-programmers, soon only
non-programs get written in it.--- Anonymouse
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Re: [Tutor] list comprehension, testing for multiple conditions

[Asokan Pichai]

On Thu, Aug 23, 2012 at 2:57 AM, Pete O'Connell pedrooconn...@gmail.com wrote:
 On Thu, Aug 23, 2012 at 4:16 AM, Alan Gauld alan.ga...@btinternet.com wrote:

 theTextAsListNoVnOrVtOrEmptyLine = [x for x in theTextAsListStripped
 if vn not in x
 if vt not in x
 if x!= ]

 It's slightly more verbose but it makes the rules more explicit, IMHO.

 I agree, it seems easier to read when written on multiple lines. I'll
 do it that way,
 Thanks
 Pete

You can look at the option of writing a function to do the selection part.
If the function is named well and also corresponds to some domain
operation or concept it can be very useful.

def select(p):
  if p == :
 return False
  return vt In p or vn in p
..

selectedLines = [ x for x in TextAsListStripped if select(x) ]
..

Asokan Pichai

If a language is designed for non-programmers, soon only
non-programs get written in it. --- Anonymouse
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Re: [Tutor] Recursive assignment in nested lists

[Asokan Pichai]

On Sat, Aug 4, 2012 at 12:28 PM, Alonzo Quijote
alonzo.quij...@gmail.com wrote:
 Is there a way to define a function which takes
a list (of lists),
a position specified by a list of integers [i0,i1,...,in], and
a value
 and returns the result of setting
 list[i0][i1]...[in]=value

 The following function works for positions up to length 3 only.
 Is it possible to write a general function that does this?

 def setValueAtPosition(list,pos,value):
 if len(pos)==1:
 list[pos[0]]=value
 elif len(pos)==2:
 list[pos[0]][pos[1]]=value
 elif len(pos)==3:
 list[pos[0]][pos[1]][pos[2]]=value
 return list

 For example
 aa=[1,2,[3,4]]

 setValueAtPosition(aa,[2,0],5)
 [1, 2, [5, 4]]

 aa
 [1, 2, [5, 4]]

 ___

Seems very odd requirement. Anyway here is one way:
---

def setValue(NestedList, pos, value):
  nl = NestedList
  for p in pos[:-1]:
   nl = nl[p]
  nl[pos[-1]] = value
  return NestedList
-
Asokan Pichai

If a language is designed for non-programmers, soon only
non-programs get written in it. --- Anonymouse
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Re: [Tutor] group txt files by month

[Asokan Pichai]

On Tue, Apr 3, 2012 at 9:29 AM, questions anon questions.a...@gmail.com wrote:
 I think what I am trying to do is relatively easy but can't get my head
 around how to do it.
 I have a list of txt files that contain daily rainfall for many years. I
 would like to produce a list that contains the year-month and the max, min
 and mean of rainfall for each month.
 My main question at this stage is how to group the files by each month for
 each year?
 They are set out like:
 r20110101.txt
 r20110102.txt
 r20110103.txt
 r20110104.txt
 r20110105.txt
 r20110106.txt
 r20110107.txt
 r20110108.txt
 r20110109.txt
 r20110110.txt
 r20110111.txt
 r20110112.txt
 r20110113.txt
 r20110114.txt
 r20110115.txt
 r20110116.txt
 r20110117.txt
 r20110118.txt

 and so on for each day for many years.

 so far I am able to open each file and calculate the max, min and mean for
 each file (see below) but not sure about grouping to monthly for each year.

# -
Monthwise = {}
# --

 MainFolder=rE:/Rainfalldata/
 outputFolder=rE:/test/
 for (path, dirs, files) in os.walk(MainFolder):
     path=path+'/'
     for fname in files:
     if fname.endswith('.txt'):
     filename=path+fname
     f=np.genfromtxt(filename, skip_header=6)
     print f.max(), f.min(), f.mean()

Replace the last two lines with
# --
   Monthwise[fname[1:7]] = .np.genfromtxt(filename, skip_header=6)
# -

Now at the end you have a dictionary whose keys are the strings of type '201012'
and the values are the f.

You can now iterate over the sorted keys of Monthwise
and print appropriately

[Ideal output etc SNIPPED]

HTH

Asokan Pichai

I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth.
 -- Umberto Eco
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Re: [Tutor] New to this list ....

[Asokan Pichai]

On Fri, Mar 30, 2012 at 9:12 PM, Barry Drake bdr...@crosswire.org wrote:
 On 30/03/12 16:19, Evert Rol wrote:

 Not sure. In the sense that you can optimise (refactor) it in the same
 way you could do with C. Eg:
 results = [0, 0, 0]
 flags = [0, 1, 2, 3]
 for flag in flags:
     results = getflag(flag, results)


 That's exactly what I hoped for.  I hadn't realised I can initialise a list
 in one go - it seems that lists work a lot like the arrays I was used to in
 c.  Thanks to the others who took the time to answer.  Just now, Asokan's
 solution is a bit obscure to me - I'll work on that one, but the above is
 lovely and elegant; and easy to understand.  Someone asked about the getflag
 function - it is:


 def getflag(thisflag, results):
    if (thisflag == 2):
        results[0] += 1
    elif (thisflag == 1): In c, I would have used switch and case, but I 
 gather there is no direct
 equivalent in Python ...   But it works as is.

 --
 From Barry Drake - a member of the Ubuntu advertising team.


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and directly index on thisflag
        results[1] += 1
    elif (thisflag == 0):
        results[2] += 1
    return(results)

For the specific values it may be simpler to write:

def getflag(thisflag, results):
 results[2- thisflag] += 1
 return results

Or you may rearrange the meaning of results
and write

 results[thisflag] += 1

HTH
Asokan Pichai
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Re: [Tutor] Reading/dealing/matching with truly huge (ascii) files

[Asokan Pichai]

Did you try loadtxt() from numpy?

http://mail.scipy.org/pipermail/scipy-user/2010-August/026431.html

the poster above notes  that 2.5 million lines and 10 columns takes 3
minutes to load.

Asokan Pichai
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Re: [Tutor] How to convert seconds to hh:mm:ss format

[Asokan Pichai]

On Fri, Feb 17, 2012 at 3:16 AM, alain Delon racg...@yahoo.com wrote:
 userName = raw_input(Enter your name )
      print hi  + userName + . \n 
      seconds = input(Enter the number of seconds since midnight:)
      hours = seconds/3600

      hoursRemain = hours%60

Here is your error

      minutes = hoursReamain/60
      secondsRemain = minutes%60
      print hours:  + minutes:  + seconds


 I'm going to be crazy. Please give me a hand. Thank you very much.

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Re: [Tutor] Character Buffer Object Error

[Asokan Pichai]

Dear Michael

Overall I see  a few problems.

0. Functions should return values. Not print them

1. Why use enumerate? The code is not using the index anyway

2. The following line appears wrong.
 new_output = ' '.join(user_input)

3. This line has a very buggy possibility.
 new_output.replace(char, new_char)
Let us say you have 234. First time you will replace 2 with 3, getting 334.
And then you will replace the first 3 with 4 getting 434 and finally
end up with 534. Of course due to other coding errors this does not
come to pass. But your basic idea of using str.replace() is prone
to this problem.

4. How are you supposed to treat 9?

Anyway back to your problem:

 I want to find all digits in a string and then increment those digits by 1
 and then return the same string with the incremented digits.

Pseudocode
--
Initialise and outstring (empty)
Read the instring character by character
if the current character is not a digit
append it to outstring
else
append the transform(current char) to outstring

If you can organize your code like this it may be easier

HTH
Regards

Asokan Pichai
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Re: [Tutor] ploting of a square well

[Asokan Pichai]

Try changing
plot(x, v)
to
plot(x, v(x))

Asokan Pichai

We are all atheists about most of the gods that societies have ever
believed in. Some of us just go one god further. – Richard Dawkins
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Re: [Tutor] ploting of a square well

[Asokan Pichai]

On Sun, Feb 5, 2012 at 11:16 PM, Asokan Pichai paso...@talentsprint.com wrote:
 Try changing
 plot(x, v)
 to
 plot(x, v(x))

 Asokan Pichai

But your v(x) is probably in need of changing. I am answering from a
machine with a small screen and no python
Hence no definite statements.

Asokan Pichai
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Re: [Tutor] something relevant to array

[Asokan Pichai]

On Fri, Dec 23, 2011 at 3:31 PM, lina lina.lastn...@gmail.com wrote:

 Hi,

[SNIPPED]

 2] I want to combine a series of files like

 a.txt

 1 a
 2 a
 3 a

 b.txt

 1 b
 2 b
 3 b

 into one as:
 a b
 a b
 a b


Is this ok?


a = [line.split()[1] for line in open('a.txt') if len(line.strip()) == 26]
b = [line.split()[1] for line in open('b.txt') if len(line.strip()) == 26]
both = zip(a, b)


Asokan Pichai
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Re: [Tutor] Need Explanation...

[Asokan Pichai]

On Sat, Dec 10, 2011 at 1:11 PM, sunil tech sunil.tech...@gmail.com wrote:
 hi,

 Consider a list: a = [1,2,3]

  a simple function, which when called it will append 100 to the list.

 def app(x):
      return x.append(100)

 p = app(a)

 now list holds appended value [1,2,3,100]
 but p is empty... why it is?

 please teach.

append() Method is a mutator; it modifies the list.

DOES NOT return the modified list; returns None
to be exact

HTH

Asokan Pichai
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Re: [Tutor] plotting in python

[Asokan Pichai]

On Thu, Dec 1, 2011 at 2:38 AM, stm atoc stm.at...@googlemail.com wrote:
 Hi there,

 I have a question regarding plotting with Python.

 I have the following python script:

[SNIPPED]
 plot(Conc[0],z)

[SNIPPED]
 ---So, What would you suggest?

What is the output of
print len(Conc[0]), len(z)

You may insert that line above the plot and see

Asokan Pichai
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Re: [Tutor] Python code trouble!

[Asokan Pichai]

Okay!

I wrote some code. It is below so that you can avoid scrolling down and
seeing it if you do not want to see any code!

HTH
Asokan
































people = list( ABCDEFGHIJKLMN)
COUNT = len(people)
remove = 3
SPACE = ' '

def survivorCount(a):
   return len(a) - a.count(SPACE)

pos = 0
men = 0
while survivorCount(people) != 1:
   if people[pos] != SPACE:
men += 1
if men % remove == 0:
  print removed, people[pos], at, pos
  people[pos] = SPACE
   pos = (pos + 1) % COUNT

print ''.join(people).strip()
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Re: [Tutor] Shortening the code

[Asokan Pichai]

On Wed, Nov 23, 2011 at 2:47 AM, Mic o0m...@hotmail.se wrote:

[LOTS OF STUFF SNIPPED]
 self.chair1.configure(bg=green)
 os.remove (Hamburg_Dortmund20_00)

 And now you delete that file you created without having
 done anything with it?

 The meaning is that when the button is pressed once,  it changes color and
 creates the file. That means you have
 booked the chair. If you click the button once more, the button removes the
 file, and changes color to green
 which indicates that you have un booked your chair. I hope you understand
 now why I delete the file :)

Often if you  [name things]/[write code] in terms of WHAT you want to do, rather
than HOW you want to do, you will find the going easier

For example, a function that is named *bookChair(chairId)*, inside which
you change color to green or whatever is worth considering.

HTH

Asokan Pichai
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Re: [Tutor] IndexError: list index out of range

[Asokan Pichai]

On Tue, Nov 22, 2011 at 4:32 AM, Steven D'Aprano st...@pearwood.infowrote:

 John wrote:


 Hi all,

 I have wriiten the following code:
 [Segment]

   def survivor(names, step):

index = step - 1
next = names
while len(next)  1:
next.remove (next[index])



 What is the intention of this function? The name given doesn't mean
 anything to me. The parameters names and step don't seem meaningful.

I guess he is trying the Josephus problem. I am guessing from the name!

If so,  you have to remember that when you delete an item you change the
positions of subsequent items.
For example, in a 11-element list, say A,  if you want to delete every
third, the index numbers you *should* delete are 2, 5, 8. But if you delete
A[2], then you will delete the original A[6] and then the original A[10].

So you have to think in terms of 'marking' for deletion and later deleting
or deleting from the other end.

A more interesting possibility is to replicate the original list and append
it to itself and delete all occurrences.

About 25 years back thats what I did in BASIC and won an honorable mention
in a coding contest in a magazine :-)
I replaced the cell contents with a space and in subsequent rounds counted
non-space items.

The first prize was won by a circular(linked-)list in Pascal, with the same
repace by Space idea

HTH

Asokan
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Re: [Tutor] A recursion question

[Asokan Pichai]

Another way to do that is to avoid any intermediate variables altogether
That may be easier to understand YMMV

def counter(mylist, val):
 if len(mylist == 0):
return 0
 if mylist[0] == val:
   return  1 + counter(mylist[1:], val)
 else:
   return counter(mylist[1:])


Asokan Pichai
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Re: [Tutor] Clock in tkinter?

[Asokan Pichai]

 On Wed, Nov 16, 2011 at 1:30 AM, Mic o0m...@hotmail.se wrote:
 Hi!
 I am new to programming
WELCOME!

and I hop this question isn’t stupid.
A teacher of mine said, The only stupid question
is the one you thought of asking but did not ask!


Happy learning

Asokan Pichai
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Re: [Tutor] how to remove the coming duplication

[Asokan Pichai]

I was so miffed at not reading the OP's
mail carefully that I wrote a one liner.

Ok. Here it goes:

def no_adjacent_dup(lst):
   return [ x for x, y in zip(lst, lst[1:]) if x != y] + [lst[-1]]

:-) Enjoyed working that one out; but whether it is a good solution 

Asokan Pichai
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Re: [Tutor] how to remove the coming duplication

[Asokan Pichai]

Bad to reply to my own post.

Failed to understand the

 just remove the coming duplication, not unique the list.

Sorry; ignore my ideas

Asokan Pichai
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Re: [Tutor] regexp

[Asokan Pichai]

IMO the regex is not too bad; I will not use it for this job -- typing
a 50+ character string
is more painful (and more error prone) than writing 5--10 lines of code.

That said, if it made you look at regexes deeply and beyond the simple
explanation
of what each character (*, ., +) does I think the teacher ended up
making you learn
something.

FInally, the simplest NON-REGEX method is probably

isAlphaOrder(s):
  return sorted(s) == list(s)

It is useful learning to add default parameters to this
to improve the functionality to case-dependent or
case independent modes.

Happy learning

Asokan Pichai
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Re: [Tutor] Tutor Digest, Vol 92, Issue 127

[Asokan Pichai]

 From: Joel Montes de Oca joelmonte...@gmail.com
 To: Tutor Python tutor@python.org
 Subject: [Tutor] Paper Rock Scissors game - User's choice not returned
properly
 Message-ID: 4eaec191.3060...@gmail.com
 Content-Type: text/plain; charset=iso-8859-1; Format=flowed

 Hello everyone,


 The function: ( http://dpaste.com/644857/)

 def  UserChoice  ():# The function that returns the choice from the
 user
print  'Please select (P) for paper, (R) for Rock, or (S) for
 Scissors.'
choice  =  raw_input('What is your selection?:')

if  choice.lower()  not  in  ('p',  'r','s'):   # Converts the
 user's choice to lowercase and confirms the choice is valid
print  'I am sorry, you entered\''  +  choice.upper()  +
  '\'  which is an invalid response. Please try again.'
raw_input('Press Enter to try again.')

   UserChoice  ()  # If the choice is not valid, run
 the function over


You should use
return UserChoice()


else:
return  choice


Asokan Pichai
SVP - Learning and Development

“Faith consists in believing when it is beyond the power of reason to
believe. 
 Voltaire http://www.brainyquote.com/quotes/quotes/v/voltaire163832.html
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Re: [Tutor] Tutor Digest, Vol 92, Issue 128

[Asokan Pichai]

Hugo's explanation is nice and clear.

You may also want to look at this way
Consider the most simplified form of the issue

def alpha():
  if  X:
   beta()
  else:
   return q

Here in the* if branch* nothing is returned
while in the *else branch *something is being returned.

That is  whenever X is True nothing is returned from alpha().
Even if beta() returns something that is not being used.

But when X is False something (q in this simplistic example)
is being returned

So this is a bug.

HTH

Asokan Pichai
SVP - Learning and Development

“Faith consists in believing when it is beyond the power of reason to
believe. 
 Voltaire http://www.brainyquote.com/quotes/quotes/v/voltaire163832.html
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