Re: [Tutor] Visual Studio Community 2017

[Jos Kerc]

Hi,

you might want to look at things like Anaconda, Enthought, ... They come
with lots of packages/libraries pre-installed and a complete programming
environment. For small project, you could even look at Jupyter. I t allows
you to have your program, data & results (IIRC even pics & vids) in
something like a webpage.
Have fun.
On Apr 18, 2017 7:08 PM, "Rafael Knuth"  wrote:

> I wanted to start my first project using matplotlib (I have never
> worked with libraries before). I am trying to get started with VS
> Community 2017, and I am having trouble performing the most basic
> tasks such as installing matplotlib. Anyone here using VS 2017? Or,
> can anyone recommend an alternative to VS for Windows? Thanks!
> ___
> Tutor maillist  -  Tutor@python.org
> To unsubscribe or change subscription options:
> https://mail.python.org/mailman/listinfo/tutor
>
___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
https://mail.python.org/mailman/listinfo/tutor

Re: [Tutor] trouble with beautiful soup

[Jos Kerc]

Hi, see below.

On Thu, Dec 24, 2015 at 6:21 PM, marcus lütolf
 wrote:
> dear pythonistas,
> for hours I'am traying to use Beautiful Soup for scraping some websites as an 
> exercise.
> But each time I run the code below:
>
 import urllib
 from BeautifulSpoup import *
>
 url =  raw_input( 'Enter -')
>
 html = urllib.urlopen(url).read()
>
 soup = BeautifulSoup(html)
 print soup
>
> I am getting the following trace back without beeing prompted for an input:
>
> Traceback (most recent call last):
>   File "C:/Python27/Beautiful Soup_ex1.py", line 2, in 
> from beautifulspoup import *
> ImportError: No module named beautifulspoup


Change beautifulspoup to beautifulsoup It's just a typo...

>
> I have installed and unzipped etc. the latest file from www.crummy.com many 
> times.
> If I click setup.py the command window appears only a fraction of a second.
> ??
>
> Happy holidays and thanks for help, Marcus.
>

HTH & nice holidays too!
>
>
>
>
> ---
> Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft.
> https://www.avast.com/antivirus
>
> ___
> Tutor maillist  -  Tutor@python.org
> To unsubscribe or change subscription options:
> https://mail.python.org/mailman/listinfo/tutor
___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
https://mail.python.org/mailman/listinfo/tutor

Re: [Tutor] create a copying tool

[Jos Kerc]

Hi,

see comments below:

On Tue, May 19, 2015 at 2:20 PM, Remco learningpyt...@hofs-bibo.nl wrote:
 Hello,

snip

 import os
 import shutil

 target_dir = r'D:\target\'
 source_dir = r'D:\source\'
 source_file = r'D:\source\list.txt'

you are not using this...

 missing_files = open(missings.txt,w)

 for line in open('list.txt'):
 source_file = os.path.normpath(source_dir +line)
 target_file = os.path.normpath(target_dir +line)
 if os.path.exists(target_file):

don't you want to check if the source file is existing?

 shutil.copyfile(source_file,target_file)
 else:
 missing_files.write(line)
 missing_files.close()
 Can someone help my fixing my problem.

 ___
 Tutor maillist  -  Tutor@python.org
 To unsubscribe or change subscription options:
 https://mail.python.org/mailman/listinfo/tutor

HTH,
___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
https://mail.python.org/mailman/listinfo/tutor

Re: [Tutor] Dictionaries and multiple keys/values

[Jos Kerc]

Hi,


On Tue, Mar 26, 2013 at 5:36 AM, Robert Sjoblom robert.sjob...@gmail.comwrote:

 Hi again, Tutor List.

 I am trying to figure out a problem I've run into. Let me first say
 that this is an assignment, so please don't give me any answers, but
 just nudge me in the general direction. So the task is this: from a
 text file, populate three different dictionaries with various
 information. The text file is structured like so:
 Georgie Porgie
 87%
 $$$
 Canadian, Pub Food

 So name, rating, price range, and food offered. After food offered
 follows a blank line before the next restaurant is listed.

 The three dictionaries are:
 name_to_rating = {}
 price_to_names = {'$': [], '$$': [], '$$$': [], '': []}
 cuisine_to_names = {}

 Now I've poked at this for a while now, and one idea I had, which I
 worked on for quite a while, was that since the restaurants all start
 at index 0, 5, 10 and so on, I could structure a while loop like this:
 with open('textfile.txt') as mdf:
   file_length = len(mdf.readlines())-1
   mdf.seek(0)
   data = mdf.readlines()


No need to calculate the file length.
Read yoiur data  ask python for the length of data.
You don't need nor want to read the file twice.


   i = 0
   while file_length  0:
 name_to_rating[data[i]] = int(data[i+1][:2])
 price_to_names[data[i+2].strip()].append(data[i].strip())
 # here's the cuisine_to_names part
 i += 5
 file_length -= 5


Another approach could be to process the file while reading it.
Since the format is fixed, you knoow exactly what information the  line
contains.



 And while this works, for the two first dictionaries,  it seems really
 cumbersome -- especially that second expression -- and very, very
 brittle. However, even if I was happy with that, I can't figure out
 what to do in the situation where:
 data[i+3] = 'Canadian, Pub Food' #should be two items, is currently a
 string.
 My problem is that I'm... stupid. I can split the entry into a list
 with two items, but even so I don't know how to add the key: value
 pair to the dictionary so that the value is a list, which I then later
 can append things to.


You might want to read up on the dict.get() method.



 I'm sorry, this sounds terribly confused, I know. I had another idea
 to feed each line to a function, because no restaurant name has a
 comma in it, and food offered always has a comma in it if the
 restaurant offers more than one kind. But again, this seems really
 brittle.

snip


 Much thanks in advance.
 --
 best regards,
 Robert S.
 ___
 Tutor maillist  -  Tutor@python.org
 To unsubscribe or change subscription options:
 http://mail.python.org/mailman/listinfo/tutor

___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor

Re: [Tutor] BMI calc

[Jos Kerc]

Hi,


On Wed, Mar 13, 2013 at 4:07 AM, Soliman, Yasmin ysoli...@uncc.edu wrote:

 I'm using python 2.7, where exactly does the return statment with the
 (return (weight/(height*height))*703 calculation get posted in the function?

 def calc_BMI(weight,height):
 if bmi =18.5:
 return 'underweight'
 elif bmi = 18.5 and bmi =24.9:
 return 'normal weight'
 elif bmi =25 and bmi =29.9:


Following return is out of alignment. Should be at the same place in the
line as the oters.


 return 'overweight'
 elif bmi =30:
 return 'obese'

 The user will need to input height ex) 5'3 and which will need to be split
 and stripped in order to convert to inches.


Exactly. Do you have a problem with this? If so what?

Dreetz
___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor

Re: [Tutor] implementing rot 13 problems

[Jos Kerc]

On Tue, Mar 12, 2013 at 6:57 AM, RJ Ewing ewing...@gmail.com wrote:

 I am trying to implement rot 13 and am having troubles. My code is as
 follows:

 class Rot_13(webapp2.RequestHandler):
 def write_form(self, user=):
  self.response.out.write(rot_form % user)
  def get(self):
 self.write_form()
  def post(self):
  user = self.request.get(text)
 s = self.rot_text(user)
  print s
 s = .join(s)
  self.escape_html(s)
 self.write_form(s)


You might want to read up on the translate() method.

  def rot_text(self, s):
  ls = [i for i in s]
 for i in ls:
  if i.isalpha():
 if i.isupper():
  if i = 'M':
 x = ls.index(i)
  ls[ls.index(i)] = chr(ord(i) + 13)
 else:
  x = ls.index(i)
 ls[ls.index(i)] = chr(ord(i) - 13)
  elif i.islower():
  if i = 'm':
 x = ls.index(i)
  ls[x] = chr(ord(i) + 13)
 elif i  'm':
  x = ls.index(i)
 ls[x] = chr(ord(i) - 13)
  return ls

  def escape_html(self, s):
 return cgi.escape(s, quote = True)

 Now if I enter abc, I get nop. But if I enter abcdefghijklmnop, I
 get abcqrstuvwxyznop. I have included print statements to check if ls[x] is
 changing and it is, but something is going wrong when I return the ls, and
 I am not quite sure what it is.

 Me neither, how are you calling /returning it?

 Thanks

 ___
 Tutor maillist  -  Tutor@python.org
 To unsubscribe or change subscription options:
 http://mail.python.org/mailman/listinfo/tutor


___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor

Re: [Tutor] How to change the char in string for Python

[Jos Kerc]

On Sun, Feb 24, 2013 at 2:26 PM, Sudo Nohup sudo.no...@gmail.com wrote:

 Thanks very much!!

 I learnt a lot from you kind reply. Not only is it about the question
 itself, but also about how to ask a question in a mailing list.(Sorry that
 it is the first time for me to ask questions in a mailing list).

 The question comes from a riddle of the PythonChallenge website(
 http://www.pythonchallenge.com/pc/def/map.html).

 Now I write the code as the following,

 mystring = g fmnc wms bgblr rpylqjyrc gr zw fylb. rfyrq ufyr amknsrcpq
 ypc dmp. bmgle gr gl zw fylb gq glcddgagclr ylb rfyr'q ufw rfgq rcvr gq qm
 jmle. sqgle qrpgle.kyicrpylq() gq pcamkkclbcb. lmu ynnjw ml rfc spj.
 temp = [ chr ( (ord(char)-ord('a')+2)%26 +ord('a'))  if
 (ord(char)=ord('a') and ord(char)=ord('z')) else char  for char in
 mystring ]
 result = .join(temp)
 print result

 OR

 mystring = g fmnc wms bgblr rpylqjyrc gr zw fylb. rfyrq ufyr amknsrcpq
 ypc dmp. bmgle gr gl zw fylb gq glcddgagclr ylb rfyr'q ufw rfgq rcvr gq qm
 jmle. sqgle qrpgle.kyicrpylq() gq pcamkkclbcb. lmu ynnjw ml rfc spj.
 result = []
 for char in mystring:
 if(ord(char)=ord('a') and ord(char)=ord('z')):
 char = chr ( (ord(char)-ord('a')+2)%26 +ord('a'))
 result.append(char)
 result = .join(result)
 print result

 Thanks,
 James




Hi James,

for this riddle, look for the translate() method.


Have fun nwith the challenges.

Jos
___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor

Re: [Tutor] New User-Need-Help

[Jos Kerc]

Sorry, sent before finishing...

If you changed raw_input, as asked.
Now, it complains about print 'Game Over'
Should become print('Game Over')


On Sat, Feb 16, 2013 at 12:10 AM, Jos Kerc josk...@gmail.com wrote:

 No, not same. At lea


 On Fri, Feb 15, 2013 at 11:44 PM, Joel Goldstick joel.goldst...@gmail.com
  wrote:

 so copy the code and the error message here


 On Fri, Feb 15, 2013 at 5:42 PM, Deborah Piotrowski 
 spiceninj...@gmail.com wrote:

 I did what you said, nothing changed.
 same errors, same syntax message.
 I suggest you run it on your IDLE to see if it works.


 On Fri, Feb 15, 2013 at 3:31 PM, Joel Goldstick 
 joel.goldst...@gmail.com wrote:




 On Fri, Feb 15, 2013 at 5:29 PM, Joel Goldstick 
 joel.goldst...@gmail.com wrote:

 Are you using python 2 or python 3?


 On Fri, Feb 15, 2013 at 5:28 PM, Deborah Piotrowski 
 spiceninj...@gmail.com wrote:

 Ok, so I made a shortcut to IDLE(GUI) and I open it up. click New
 Window and type in the code:
 print Game Over
 raw_input(\n\nPress Enter Key to exit)
 and save the file on my desktop.
 I double-click it and it opens a black window with gray text for a
 split second and if you look quickly enough then you can see Invalid
 Sytnax.
 If I do the same code in the Interactive Window then it highlights
 raw_input and says Invalid Syntax

 Are you using python 2 or python 3?


 Sorry, you said above python 3.  In python 3 raw_input was changed to
 input.  so change that and it will work for you.
 There are some differences between 2 and 3 that you will need to look
 out for.  Go to the python.org site to learn about them.  Your book
 was written for python 2 it seems



 On Fri, Feb 15, 2013 at 3:12 PM, Joel Goldstick 
 joel.goldst...@gmail.com wrote:




 On Fri, Feb 15, 2013 at 5:09 PM, Deborah Piotrowski 
 spiceninj...@gmail.com wrote:

 It Didn't work.


 First of all, reply to all.  You are sending messages to me only,
 not to the group.  Other's may be able to help you better than I can.

 Second.  It didn't work is not a useful answer.

 So you have a file with two lines in it.  The first has a print
 statement.  The second has a raw_input statement.  When you run it, what
 happens exactly? Do you get a traceback message telling you what the 
 error
 is, and on what line?





 On Fri, Feb 15, 2013 at 3:05 PM, Joel Goldstick 
 joel.goldst...@gmail.com wrote:




 On Fri, Feb 15, 2013 at 5:03 PM, Deborah Piotrowski 
 spiceninj...@gmail.com wrote:



 On Fri, Feb 15, 2013 at 2:58 PM, Joel Goldstick 
 joel.goldst...@gmail.com wrote:




 On Fri, Feb 15, 2013 at 4:45 PM, Deborah Piotrowski 
 spiceninj...@gmail.com wrote:

 Hi,


 I am very new to Python, I am using the e-book Python
 Programming for the Absolute Beginner and am starting with a 
 simple Game
 Over Program.  This is the code:which is extremely simple!
 printGame Over raw_input(\n\nPress Enter Key to exit)


 welcome Nicholas


 One important thing about python is indentation is important.
 You have presented your code in a way that can't be.  Can you 
 actually copy
 your program and paste it into an email message.  Also, Windows, 
 Linux, Mac?



 That's it. It is supposed to bring up a window that says Game
 Over and at the bottom say Press enter Key to exit and when you 
 press
 the enter key it is supposed to exit(big suprise).
 But all it does is highlight raw_input and says invalid
 syntax Now, if I just put print Game Over then it says Game 
 Over
 UNDERNEATH the code I just printed!
 now I am following the book to the *pixel* and that is not
 what is supposed to happen!
 Please email me back as soon as you get this...(if you are not
 to busy).

 Thanks,Nicholas

 --
 http://mail.python.org/mailman/listinfo/python-list




 --
 Joel Goldstick
 http://joelgoldstick.com



 Sorry, I am using Windows 7 Ultimate 32-bit with Python 3.3
 Here is the code in exact form
 print Game Over
  raw_input(\n\nPress Enter Key to Exit)
 Thanks,
 Nicholas


 You need to unindent the raw_input like so:


 print Game Over
 raw_input(\n\nPress Enter Key to Exit)

 In python you indent code blocks (like for loops, if statements,
 function blocks, etc.).  You can't just indent from one line to the 
 next in
 sequential code or you will be told its a syntax error



 --
 Joel Goldstick
 http://joelgoldstick.com




 --
 Nicholas J. Piotrowski




 --
 Joel Goldstick
 http://joelgoldstick.com




 --
 Nicholas J. Piotrowski




 --
 Joel Goldstick
 http://joelgoldstick.com




 --
 Joel Goldstick
 http://joelgoldstick.com




 --
 Nicholas J. Piotrowski




 --
 Joel Goldstick
 http://joelgoldstick.com

 ___
 Tutor maillist  -  Tutor@python.org
 To unsubscribe or change subscription options:
 http://mail.python.org/mailman/listinfo/tutor



___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor

Re: [Tutor] New User-Need-Help

[Jos Kerc]

No, not same. At lea


On Fri, Feb 15, 2013 at 11:44 PM, Joel Goldstick
joel.goldst...@gmail.comwrote:

 so copy the code and the error message here


 On Fri, Feb 15, 2013 at 5:42 PM, Deborah Piotrowski 
 spiceninj...@gmail.com wrote:

 I did what you said, nothing changed.
 same errors, same syntax message.
 I suggest you run it on your IDLE to see if it works.


 On Fri, Feb 15, 2013 at 3:31 PM, Joel Goldstick joel.goldst...@gmail.com
  wrote:




 On Fri, Feb 15, 2013 at 5:29 PM, Joel Goldstick 
 joel.goldst...@gmail.com wrote:

 Are you using python 2 or python 3?


 On Fri, Feb 15, 2013 at 5:28 PM, Deborah Piotrowski 
 spiceninj...@gmail.com wrote:

 Ok, so I made a shortcut to IDLE(GUI) and I open it up. click New
 Window and type in the code:
 print Game Over
 raw_input(\n\nPress Enter Key to exit)
 and save the file on my desktop.
 I double-click it and it opens a black window with gray text for a
 split second and if you look quickly enough then you can see Invalid
 Sytnax.
 If I do the same code in the Interactive Window then it highlights
 raw_input and says Invalid Syntax

 Are you using python 2 or python 3?


 Sorry, you said above python 3.  In python 3 raw_input was changed to
 input.  so change that and it will work for you.
 There are some differences between 2 and 3 that you will need to look
 out for.  Go to the python.org site to learn about them.  Your book was
 written for python 2 it seems



 On Fri, Feb 15, 2013 at 3:12 PM, Joel Goldstick 
 joel.goldst...@gmail.com wrote:




 On Fri, Feb 15, 2013 at 5:09 PM, Deborah Piotrowski 
 spiceninj...@gmail.com wrote:

 It Didn't work.


 First of all, reply to all.  You are sending messages to me only, not
 to the group.  Other's may be able to help you better than I can.

 Second.  It didn't work is not a useful answer.

 So you have a file with two lines in it.  The first has a print
 statement.  The second has a raw_input statement.  When you run it, what
 happens exactly? Do you get a traceback message telling you what the 
 error
 is, and on what line?





 On Fri, Feb 15, 2013 at 3:05 PM, Joel Goldstick 
 joel.goldst...@gmail.com wrote:




 On Fri, Feb 15, 2013 at 5:03 PM, Deborah Piotrowski 
 spiceninj...@gmail.com wrote:



 On Fri, Feb 15, 2013 at 2:58 PM, Joel Goldstick 
 joel.goldst...@gmail.com wrote:




 On Fri, Feb 15, 2013 at 4:45 PM, Deborah Piotrowski 
 spiceninj...@gmail.com wrote:

 Hi,


 I am very new to Python, I am using the e-book Python
 Programming for the Absolute Beginner and am starting with a 
 simple Game
 Over Program.  This is the code:which is extremely simple!
 printGame Over raw_input(\n\nPress Enter Key to exit)


 welcome Nicholas


 One important thing about python is indentation is important.
 You have presented your code in a way that can't be.  Can you 
 actually copy
 your program and paste it into an email message.  Also, Windows, 
 Linux, Mac?



 That's it. It is supposed to bring up a window that says Game
 Over and at the bottom say Press enter Key to exit and when you 
 press
 the enter key it is supposed to exit(big suprise).
 But all it does is highlight raw_input and says invalid
 syntax Now, if I just put print Game Over then it says Game 
 Over
 UNDERNEATH the code I just printed!
 now I am following the book to the *pixel* and that is not what
 is supposed to happen!
 Please email me back as soon as you get this...(if you are not
 to busy).

 Thanks,Nicholas

 --
 http://mail.python.org/mailman/listinfo/python-list




 --
 Joel Goldstick
 http://joelgoldstick.com



 Sorry, I am using Windows 7 Ultimate 32-bit with Python 3.3
 Here is the code in exact form
 print Game Over
  raw_input(\n\nPress Enter Key to Exit)
 Thanks,
 Nicholas


 You need to unindent the raw_input like so:


 print Game Over
 raw_input(\n\nPress Enter Key to Exit)

 In python you indent code blocks (like for loops, if statements,
 function blocks, etc.).  You can't just indent from one line to the 
 next in
 sequential code or you will be told its a syntax error



 --
 Joel Goldstick
 http://joelgoldstick.com




 --
 Nicholas J. Piotrowski




 --
 Joel Goldstick
 http://joelgoldstick.com




 --
 Nicholas J. Piotrowski




 --
 Joel Goldstick
 http://joelgoldstick.com




 --
 Joel Goldstick
 http://joelgoldstick.com




 --
 Nicholas J. Piotrowski




 --
 Joel Goldstick
 http://joelgoldstick.com

 ___
 Tutor maillist  -  Tutor@python.org
 To unsubscribe or change subscription options:
 http://mail.python.org/mailman/listinfo/tutor


___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor

Re: [Tutor] New User-Need-Help

[Jos Kerc]

On Sat, Feb 16, 2013 at 12:20 AM, Deborah Piotrowski spiceninj...@gmail.com
 wrote:

 It works, but it doesn't open a window. It just says that stuff under the
 code. How do you open a window?





Depends...
How do you run the script? From Idle, command prompt?



 On Fri, Feb 15, 2013 at 4:14 PM, Jos Kerc josk...@gmail.com wrote:

 Sorry, sent before finishing...

 If you changed raw_input, as asked.
 Now, it complains about print 'Game Over'
 Should become print('Game Over')


 On Sat, Feb 16, 2013 at 12:10 AM, Jos Kerc josk...@gmail.com wrote:

 No, not same. At lea


 On Fri, Feb 15, 2013 at 11:44 PM, Joel Goldstick 
 joel.goldst...@gmail.com wrote:

 so copy the code and the error message here


 On Fri, Feb 15, 2013 at 5:42 PM, Deborah Piotrowski 
 spiceninj...@gmail.com wrote:

 I did what you said, nothing changed.
 same errors, same syntax message.
 I suggest you run it on your IDLE to see if it works.


 On Fri, Feb 15, 2013 at 3:31 PM, Joel Goldstick 
 joel.goldst...@gmail.com wrote:




 On Fri, Feb 15, 2013 at 5:29 PM, Joel Goldstick 
 joel.goldst...@gmail.com wrote:

 Are you using python 2 or python 3?


 On Fri, Feb 15, 2013 at 5:28 PM, Deborah Piotrowski 
 spiceninj...@gmail.com wrote:

 Ok, so I made a shortcut to IDLE(GUI) and I open it up. click New
 Window and type in the code:
 print Game Over
 raw_input(\n\nPress Enter Key to exit)
 and save the file on my desktop.
 I double-click it and it opens a black window with gray text for a
 split second and if you look quickly enough then you can see Invalid
 Sytnax.
 If I do the same code in the Interactive Window then it highlights
 raw_input and says Invalid Syntax

 Are you using python 2 or python 3?


 Sorry, you said above python 3.  In python 3 raw_input was changed to
 input.  so change that and it will work for you.
 There are some differences between 2 and 3 that you will need to look
 out for.  Go to the python.org site to learn about them.  Your book
 was written for python 2 it seems



 On Fri, Feb 15, 2013 at 3:12 PM, Joel Goldstick 
 joel.goldst...@gmail.com wrote:




 On Fri, Feb 15, 2013 at 5:09 PM, Deborah Piotrowski 
 spiceninj...@gmail.com wrote:

 It Didn't work.


 First of all, reply to all.  You are sending messages to me only,
 not to the group.  Other's may be able to help you better than I can.

 Second.  It didn't work is not a useful answer.

 So you have a file with two lines in it.  The first has a print
 statement.  The second has a raw_input statement.  When you run it, 
 what
 happens exactly? Do you get a traceback message telling you what the 
 error
 is, and on what line?





 On Fri, Feb 15, 2013 at 3:05 PM, Joel Goldstick 
 joel.goldst...@gmail.com wrote:




 On Fri, Feb 15, 2013 at 5:03 PM, Deborah Piotrowski 
 spiceninj...@gmail.com wrote:



 On Fri, Feb 15, 2013 at 2:58 PM, Joel Goldstick 
 joel.goldst...@gmail.com wrote:




 On Fri, Feb 15, 2013 at 4:45 PM, Deborah Piotrowski 
 spiceninj...@gmail.com wrote:

 Hi,


 I am very new to Python, I am using the e-book Python
 Programming for the Absolute Beginner and am starting with a 
 simple Game
 Over Program.  This is the code:which is extremely simple!
 printGame Over raw_input(\n\nPress Enter Key to exit)


 welcome Nicholas


 One important thing about python is indentation is important.
 You have presented your code in a way that can't be.  Can you 
 actually copy
 your program and paste it into an email message.  Also, Windows, 
 Linux, Mac?



 That's it. It is supposed to bring up a window that says
 Game Over and at the bottom say Press enter Key to exit and 
 when you
 press the enter key it is supposed to exit(big suprise).
 But all it does is highlight raw_input and says invalid
 syntax Now, if I just put print Game Over then it says Game 
 Over
 UNDERNEATH the code I just printed!
 now I am following the book to the *pixel* and that is not
 what is supposed to happen!
 Please email me back as soon as you get this...(if you are
 not to busy).

 Thanks,Nicholas

 --
 http://mail.python.org/mailman/listinfo/python-list




 --
 Joel Goldstick
 http://joelgoldstick.com



 Sorry, I am using Windows 7 Ultimate 32-bit with Python 3.3
 Here is the code in exact form
 print Game Over
  raw_input(\n\nPress Enter Key to Exit)
 Thanks,
 Nicholas


 You need to unindent the raw_input like so:


 print Game Over
 raw_input(\n\nPress Enter Key to Exit)

 In python you indent code blocks (like for loops, if statements,
 function blocks, etc.).  You can't just indent from one line to the 
 next in
 sequential code or you will be told its a syntax error



 --
 Joel Goldstick
 http://joelgoldstick.com




 --
 Nicholas J. Piotrowski




 --
 Joel Goldstick
 http://joelgoldstick.com




 --
 Nicholas J. Piotrowski




 --
 Joel Goldstick
 http://joelgoldstick.com




 --
 Joel Goldstick
 http://joelgoldstick.com




 --
 Nicholas J. Piotrowski




 --
 Joel Goldstick
 http://joelgoldstick.com

Re: [Tutor] Help!

[Jos Kerc]

You are missing a multiplication sign.

Near the end of your formula.


On Fri, Jan 18, 2013 at 1:56 PM, Carpenter, Steven 
steven.carpen...@oakland.k12.mi.us wrote:

 To Whom it May Concern,

 I’m trying to get this code working. *Here’s my question:*

 Consider a triangle with sides of length 3, 7, and 9. The law of cosines
 states that given three sides of a triangle (a, b, and c) and angle C
 between sides a and b: Write Python code to calculate the three angles in
 the triangle.

 *Here’s my code: *

 # Calculate the angles in a triangle

 # Imports the Math data

 import math

 # Sets up the different angles with corresponding letters

 # The first angle is a

 a = 3

 # The second angle is b

 b = 7

 # The third angle is c

 c = 9

 # Calculates angle C

 print(math.acos(((a**2)+(b**2)-(c**2))/(2(a*b

 *Here’s my output:*

 Traceback (most recent call last):

   File E:\Programming\Problem4.py, line 12, in module

 print(math.acos(((a**2)+(b**2)-(c**2))/(2(a*b

 TypeError: 'int' object is not callable

 ** **

 *Steven Carpenter*

 ___
 Tutor maillist  -  Tutor@python.org
 To unsubscribe or change subscription options:
 http://mail.python.org/mailman/listinfo/tutor


___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor

Re: [Tutor] Recursion doubt

[Jos Kerc]

Hi,

you are tackling 3 heavy subjects in just 1 go!

graphs :a triving math society would approve your choice. But you might
start with the *slightly* less difficult challenge: trees.
I do not know your math/programming background, so the following link can
perhaps enlighten you: http://www.brpreiss.com/books/opus7/

Trees, graphs, queues and what more implemented in several languages. Python
included.
Also, most CS starters have chapters devoted to (some of) them.
(E.g. http://www.greenteapress.com/thinkpython/)

Backtracking  recursion will surely be topics too.
 Reading them will help getting a handle on it

The 3 chosen topics are advanced or even rather advanced even for most of CS
people.


To return to your question...
Basically, find_path takes a node connected to 'start', if not at the 'end',
make the current node 'start' and see if find_path does return a path. As
soon as a path is foud find_path quits searching.

You can look at find_all as a master routine that keeps calling find_path
until find_path gives up. If the search space has not been exhausted (here
there are still other nodes connected to 'start') take a suitable candidate
call find_path from there until no more paths from there can be found.
Repeat until no more suitable candidates.

As you have gone through the whole search space, all paths from 'start' to
'end' were found.

Recursion makes backtracking easier: the program/routine will by itself keep
track of the steps taken  where to go back if a search fails.

Backtracking is the powerful technique of remembering the steps already
taken  to retrace them till the first non-explored sidetrack when needed.

Choosing the next non-explored sidetrack though can be complex involving
other searches, ...
It all depends on what you look for, how the data is represented.

A related topic that will help you understand things is breadth-first 
depth-first searches on trees.

(in this case find_path executes a depth-first search on the graph -
represented as a dictionary  find_all combines the 2 searches, first the
depth search  when it quits, the breadth search takes over.)

Greetz

On 4/15/08, Anshu Raval [EMAIL PROTECTED] wrote:

  Hi,
 At the url 
 *http://www.python.org/doc/essays/graphs.html*http://www.python.org/doc/essays/graphs.htmlthere
  is some
 code by Guido Van Rossum for computing paths through a graph - I have
 pasted it below for reference -

 Let's write a simple function to determine a path between two nodes.
 It takes a graph and the start and end nodes as arguments. It will
 return a list of nodes (including the start and end nodes) comprising
 the path. When no path can be found, it returns None. The same node
 will not occur more than once on the path returned (i.e. it won't
 contain cycles). The algorithm uses an important technique called
 backtracking: it tries each possibility in turn until it finds a
 solution.

 def find_path(graph, start, end, path=[]):
 path = path + [start]
 if start == end:
 return path
 if not graph.has_key(start):
 return None
 for node in graph[start]:
 if node not in path:
 newpath = find_path(graph, node, end, path)
 if newpath: return newpath
 return None

 *** He then says

 It is simple to change this function to return a list of all paths
 (without cycles) instead of the first path it finds:

 def find_all_paths(graph, start, end, path=[]):
 path = path + [start]
 if start == end:
 return [path]
 if not graph.has_key(start):
 return []
 paths = []
 for node in graph[start]:
 if node not in path:
 newpaths = find_all_paths(graph, node, end, path)
 for newpath in newpaths:
 paths.append(newpath)
 return paths

 *** I couldn't understand how it was simple to change the function
 find paths to find all paths. How would you think about writing this
 second function recursively. Especially the part about if start==end:
 return [path]. I feel you would give square brackets around path here
 after first writing the inductive part ... for node in
 graph[start] 
 and then by trial and error put square brackets around path in the
 Basis part. Can someone please explain how to write this code. Thanks!




 --
 Planning marriage in 2008! Join Shaadi.com matrimony FREE! Try it 
 now!http://ss1.richmedia.in/recurl.asp?pid=429

 ___
 Tutor maillist  -  Tutor@python.org
 http://mail.python.org/mailman/listinfo/tutor


___
Tutor maillist  -  Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor