Re: [Tutor] '__name__' == '__main__'
On 02/20/2012 11:55 PM, Michael Lewis wrote: I am back to being confused. I just tried running the module without first importing it, and it worked just fine. How do I do this properly to where the module only runs if I import it? I'd still like a definition of "just fine." But anyway, your first problem is you somehow added extra quotes to a line that you had right in an earlier version. Comparing two unequal literal strings will never prove true. So the dependent clause never runs. if "__name__" == '__main__': GetUserInput() that should be if __name__ == "__main__": do something else: do something else You'll have to decide which one you want to call GetUserInput() from. You'll then have to decide if you really want to throw away the result. Just because IDLE dumps something out doesn't mean it'll get printed out when a person runs the program from a commandline. At the very least, you want print GetUserInput() although most of my earlier arguments might apply someday, once you're past this stuff. Try inserting temporary prints into the code, so you can tell what has executed and what has not. -- DaveA ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] '__name__' == '__main__'
On 2012/02/21 06:55 AM, Michael Lewis wrote:
I am back to being confused. I just tried running the module without
first importing it, and it worked just fine. How do I do this properly
to where the module only runs if I import it?
Code:
def MultiplyText(text, multiplier):
'''Recieve a S & int. For digits in S, multiply by multiplier and
return updated S.'''
return ' '.join(str(int(num) * multiplier) if num.isdigit() else
num for num in text)
def GetUserInput():
'''Get S & multiplier. Test multiplier.isdigit(). Call
MultiplyText(text, multiplier)'''
text = raw_input('Enter some text: ')
while True:
multiplier = raw_input('Enter a multiplier: ')
try:
multiplier = int(multiplier)
break
except ValueError:
continue
return MultiplyText(text.split(), multiplier)
if "__name__" == '__main__':
GetUserInput()
What I did in IDLE:
>>>
>>> GetUserInput()
Enter some text: 4 times
Enter a multiplier: 2
'8 times'
>>>
--
Michael J. Lewis
mjole...@gmail.com
415.815.7257
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If you change '__main__' to the name of the file, without the extension,
it will match __name__.
Alternatively, you can have an else after your `__name__ == '__main__'`
$ cat t1.py
if __name__ == '__main__':
print 'Executed from __main__'
if __name__ == 't1':
print 'Executed by import from t2'
$ cat t2.py
import t1
$ python t1.py
Executed from __main__
$ python t2.py
Executed by import from t2
$ cat t3.py
if __name__ == '__main__':
print 'Executed from __main__'
else:
print 'Executed by import'
$ cat t4.py
import t3
$ python t3.py
Executed from __main__
$ python t4.py
Executed by import
--
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Python Developer
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[Tutor] '__name__' == '__main__'
I am back to being confused. I just tried running the module without first
importing it, and it worked just fine. How do I do this properly to where
the module only runs if I import it?
Code:
def MultiplyText(text, multiplier):
'''Recieve a S & int. For digits in S, multiply by multiplier and
return updated S.'''
return ' '.join(str(int(num) * multiplier) if num.isdigit() else num
for num in text)
def GetUserInput():
'''Get S & multiplier. Test multiplier.isdigit(). Call
MultiplyText(text, multiplier)'''
text = raw_input('Enter some text: ')
while True:
multiplier = raw_input('Enter a multiplier: ')
try:
multiplier = int(multiplier)
break
except ValueError:
continue
return MultiplyText(text.split(), multiplier)
if "__name__" == '__main__':
GetUserInput()
What I did in IDLE:
>>>
>>> GetUserInput()
Enter some text: 4 times
Enter a multiplier: 2
'8 times'
>>>
--
Michael J. Lewis
mjole...@gmail.com
415.815.7257
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Re: [Tutor] __name__=='__main__'
On 02/20/2012 10:07 PM, Michael Lewis wrote:
Now that I am better understanding '__name__'=='__main__', I need to get
advice on one last part. Since you put this in the file as an if statement,
some instruction must come after. What do you suggest putting after this
statement/is that piece of code ever put into action?
In my example below, I've done a few tests like putting a print statement
under '__name__'=='__main__' and it isn't printed. I am not sure what to
put in this code block.
def MultiplyText(text, multiplier):
'''Recieve a S& int. For digits in S, multiply by multiplier and
return updated S.'''
return ' '.join(str(int(num) * multiplier) if num.isdigit() else num
for num in text)
def GetUserInput():
'''Get S& multiplier. Test multiplier.isdigit(). Call
MultiplyText(text, multiplier)'''
text = raw_input('Enter some text: ')
while True:
multiplier = raw_input('Enter a multiplier: ')
try:
multiplier = int(multiplier)
break
except ValueError:
continue
return MultiplyText(text.split(), multiplier)
if '__name__' == '__main__':
GetUserInput()
I don't see any print statement in the if-clause. In fact I don't see
any prints in the entire program. Just how do you expect to know if it
even ran?
What IS there is a call to GetUserInput(). But for some reason that
function doesn't return user-input. Why not? A function should nearly
always take some arguments, and return a result. And its name should
reflect what it's going to do
Besides that, you do return a value from GetUserInput()., but never use
that value. So what's the point?
Probably what belongs in the if clause is a call to main(). Then you
need to write main() function, to call GetUserInput() and save the value
returned (a tuple of string and int, my choice). Then it'd call
MultiplyText with those two, and with this mysterious num value that you
conjured up in MultiplyText.
Once you've factored the two functions into separately called entities,
you have a chance of debugging your multiple mistakes still remaining.
In between the two function calls in main(), you can actually print
out your intermediate results, and see if they look reasonable to you.
In fact, while testing, you just might want to try calling
MultiplyText() with whatever literal arguments make sense. And print
the result you get. A few of those tests, and you might get comfortable
with the function.
--
DaveA
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Re: [Tutor] __name__=='__main__'
Now that I am better understanding '__name__'=='__main__', I need to get
advice on one last part. Since you put this in the file as an if statement,
some instruction must come after. What do you suggest putting after this
statement/is that piece of code ever put into action?
In my example below, I've done a few tests like putting a print statement
under '__name__'=='__main__' and it isn't printed. I am not sure what to
put in this code block.
def MultiplyText(text, multiplier):
'''Recieve a S & int. For digits in S, multiply by multiplier and
return updated S.'''
return ' '.join(str(int(num) * multiplier) if num.isdigit() else num
for num in text)
def GetUserInput():
'''Get S & multiplier. Test multiplier.isdigit(). Call
MultiplyText(text, multiplier)'''
text = raw_input('Enter some text: ')
while True:
multiplier = raw_input('Enter a multiplier: ')
try:
multiplier = int(multiplier)
break
except ValueError:
continue
return MultiplyText(text.split(), multiplier)
if '__name__' == '__main__':
GetUserInput()
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Re: [Tutor] __name__=='__main__'
On 02/20/2012 06:46 PM, Michael Lewis wrote: Hi everyone, I am having some trouble understanding how to use __name__== '__main__'. Can you please give me some insight? Also, to use this, it needs to be within a function? Do you typically just throw it in your very last function or create a separate function just for this? I at first put it outside and after all my functions but got the error below and then put it inside my last function and the program ran. (side note, I have an error in my return for MultiplyText that I am still trying to work out, so you can ignore that part). Code: Nothing magic about that line (if __name__ == "__main__"). You need to understand the components, and why you're using them. As others have pointed out, your original error was simply due to a typo. Every module has a __name__ attribute. If a module is imported, that attribute is set to the module's name. But if it is run directly (eg. if you runpython myfile.py) then it has the name "__main__" rather than "myfile". So if you fix the typo, and still have an error, then explain what you run, and how, rather than saying something like "code now runs WITHOUT me explicitly importing it." For example: my source file is called X.py which looks like: When I run the Linux commandline: python X I get the following results. (and yes, I know the above won't work. I'm trying to force you to tell us what you really did) -- DaveA ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] __name__=='__main__'
> I am having some trouble understanding how to use __name__== '__main__'. Can
> you please give me some insight?
if __name__ == '__main__': allows you to specify code that will only
be run if you run the actual script it's in; anything in the if block
won't be run if you import the module.
>Also, to use this, it needs to be within a
> function? Do you typically just throw it in your very last function or
> create a separate function just for this? I at first put it outside and
> after all my functions but got the error below and then put it inside my
> last function and the program ran. (side note, I have an error in my return
> for MultiplyText that I am still trying to work out, so you can ignore that
> part).
No, it doesn't have to be in a function, but if you wish you can have
it in a function main() or similar. The reason why you're getting an
error isn't because it's outside a function, it's because you're not
using the correct name:
> Traceback (most recent call last):
> File "C:/Python27/Homework/Homework5_1.py", line 24, in
> if __name == '__main__':
> NameError: name '__name' is not defined
As it says in the traceback, '__name' is not defined. It should be '__name__'.
> def GetUserInput():
> '''Get S & multiplier. Test multiplier.isdigit(). Call
> MultiplyText(text, multiplier)'''
> while True:
> text = raw_input('Enter some text: ')
> multiplier = raw_input('Enter a multiplier: ')
> try:
> multiplier.isdigit()
> break
> except ValueError:
> continue
> new_text = MultiplyText(text, multiplier)
> return new_text
>
> if __name == '__main__':
> print GetUserInput()
You shouldn't have the "if '__name__' " block in any of your functions
(except possibly main()), it looks bad. I'm unsure if it'll affect
things when you import functions, but on the off-chance that it does,
you shouldn't do it.
A short example:
critter.py:
class Critter(object):
"""A virtual pet."""
def __init__(self):
print("A new critter has been born!")
def talk(self):
print("Hi, I'm an instance of class Critter.")
if __name__ == '__main__':
crit1 = Critter()
crit2 = Critter()
crit1.talk()
crit2.talk()
If I run this from critter.py, I will get the following output:
A new critter has been born!
A new critter has been born!
Hi, I'm an instance of class Critter.
Hi, I'm an instance of class Critter.
However, if I create a critter_import.py and inside it import my Critter class:
from critter import Critter
if __name__ == '__main__':
print("This is critter_import.py")
The output will only be:
This is critter_import.py
If I subsequently create critters in critter_import.py, I will indeed
get the output that we see in critter.py, but that's because of class
behaviour and not because the if '__name__' block in critter.py
executes.
I might have made a mess of explaining things. In short: if '__name__'
== '__main__': only happens if you run the actual file, whereas it
won't happen if you import things from the file.
--
best regards,
Robert S.
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Re: [Tutor] __name__=='__main__'
Thanks. I did end up catching those, but to be fair to all the others, I
did ask that they ignore that issue as I was still working through it on my
own.
On Mon, Feb 20, 2012 at 4:55 PM, bob gailer wrote:
> No one else has caught another problem. I comment on it below:
>
>
> On 2/20/2012 6:46 PM, Michael Lewis wrote:
>
>> Hi everyone,
>>
>> I am having some trouble understanding how to use __name__== '__main__'.
>> Can you please give me some insight? Also, to use this, it needs to be
>> within a function? Do you typically just throw it in your very last
>> function or create a separate function just for this? I at first put it
>> outside and after all my functions but got the error below and then put it
>> inside my last function and the program ran. (side note, I have an error in
>> my return for MultiplyText that I am still trying to work out, so you can
>> ignore that part).
>>
>> Code:
>>
>> '''homework 5_1'''
>>
>> def MultiplyText(text, multiplier):
>>'''Recieve a S. For digits in S, multiply by multiplier and return
>> updated S.'''
>>for num in text:
>>return ''.join(str(int(num) * multiplier) if num.isdigit() else
>> num for num in text)
>>
> This will fail, as multiplier is a string.
>
>
>>
>> def GetUserInput():
>>'''Get S & multiplier. Test multiplier.isdigit(). Call
>> MultiplyText(text, multiplier)'''
>>while True:
>>text = raw_input('Enter some text: ')
>>multiplier = raw_input('Enter a multiplier: ')
>>try:
>>multiplier.isdigit()
>>
> multiplier.isdigit() returns True or False. It will not raise an exception!
>
> break
>>except ValueError:
>>continue
>>new_text = MultiplyText(text, multiplier)
>>return new_text
>>
>>if __name == '__main__':
>>print GetUserInput()
>>
>> To fix both problems replace
> multiplier.isdigit()
> with
> multiplier = int(multiplier)
>
> --
> Bob Gailer
> 919-636-4239
> Chapel Hill NC
>
>
--
Michael J. Lewis
mjole...@gmail.com
415.815.7257
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[Tutor] Scribes with python debugger
Does anyone know of a plugin or some other way to run python code in the scribes text editor in a similar way to Idle which has a debugger? Thanks, Tahir ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] __name__=='__main__'
No one else has caught another problem. I comment on it below:
On 2/20/2012 6:46 PM, Michael Lewis wrote:
Hi everyone,
I am having some trouble understanding how to use __name__==
'__main__'. Can you please give me some insight? Also, to use this, it
needs to be within a function? Do you typically just throw it in your
very last function or create a separate function just for this? I at
first put it outside and after all my functions but got the error
below and then put it inside my last function and the program ran.
(side note, I have an error in my return for MultiplyText that I am
still trying to work out, so you can ignore that part).
Code:
'''homework 5_1'''
def MultiplyText(text, multiplier):
'''Recieve a S. For digits in S, multiply by multiplier and return
updated S.'''
for num in text:
return ''.join(str(int(num) * multiplier) if num.isdigit()
else num for num in text)
This will fail, as multiplier is a string.
def GetUserInput():
'''Get S & multiplier. Test multiplier.isdigit(). Call
MultiplyText(text, multiplier)'''
while True:
text = raw_input('Enter some text: ')
multiplier = raw_input('Enter a multiplier: ')
try:
multiplier.isdigit()
multiplier.isdigit() returns True or False. It will not raise an exception!
break
except ValueError:
continue
new_text = MultiplyText(text, multiplier)
return new_text
if __name == '__main__':
print GetUserInput()
To fix both problems replace
multiplier.isdigit()
with
multiplier = int(multiplier)
--
Bob Gailer
919-636-4239
Chapel Hill NC
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Re: [Tutor] Tutor Digest, Vol 96, Issue 83
> On Mon, Feb 20, 2012 at 6:46 PM, Michael Lewis wrote:
> > I at first put it outside and after all my functions but got the error
> below
>
> That's the right place for it, you just spelled it wrong.
>
> > and then put it inside my last function and the program ran.
>
> That's not the right place for it. Your program ran, but only because
> nothing ever called your GetUserInput() function any more.
Now I am confused. I fixed the spelling and put it outside all my
functions; however, the code now runs WITHOUT me explicitly importing it.
def MultiplyText(text, multiplier):
'''Recieve a S & int. For digits in S, multiply by multiplier and
return updated S.'''
return ' '.join(str(int(num) * multiplier) if num.isdigit() else num
for num in text)
def GetUserInput():
'''Get S & multiplier. Test multiplier.isdigit(). Call
MultiplyText(text, multiplier)'''
text = raw_input('Enter some text: ')
while True:
multiplier = raw_input('Enter a multiplier: ')
try:
multiplier = int(multiplier)
break
except ValueError:
continue
return MultiplyText(text.split(), multiplier)
if __name__ == '__main__':
GetUserInput()
>
> > Traceback (most recent call last):
> > ? File "C:/Python27/Homework/Homework5_1.py", line 24, in
> > ? ? if __name == '__main__':
> > NameError: name '__name' is not defined
>
> It needs to be spelled "__name__" -- that's two underscores on each side.
>
> --
> Jerry
>
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Re: [Tutor] ssh from Windows to a Solaris server
Alan Gauld wrote:
On 20/02/12 21:17, Do Nguyen (donguye) wrote:
command1 = "plink -ssh -pw myPassword myUserName@myServerIP"
p1 = subprocess.Popen(command1)
p2 = subprocess.Popen('ls')
I could verify that command1 was executed successfully, ie. the ssh to
myServer worked, but command2 was treated locally in the Windows
Yes, because you created a new subprocess.Popen object.
If you want to communicate with ssh in the first subprocess you need to
send commands to stdin on p1. There are lots of examples how to
read/write to stdin/out in the subprocess documentation. (I'm assuming
that plink stays open, I've never used it so don't know)
I don't know about plink, but the right way to run commands on a remote
machine using ssh is to give those commands to ssh as an argument. E.g.
http://linuxers.org/howto/how-run-commands-remote-machine-using-ssh
http://systemsboy.com/2006/07/send-remote-commands-via-ssh.html
--
Steven
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Re: [Tutor] __name__=='__main__'
On 20/02/12 23:46, Michael Lewis wrote: I am having some trouble understanding how to use __name__== '__main__'. Can you please give me some insight? Others have told you how to fix it. The insight is that when you import a python file its __name__ attribute is set to the module name. When you run it as the top level script its __name__ is set to __main__. So you want to create an 'if' test, and it can be anywhere in your code there is nothing special about it, but usually it's at the bottom of the file and looks like: def moduleFunc() # this is the code that gets used as a module def anotherFunc(): #and so is this def main(): # put your main program code here # it doesn't get run if the file # is imported # - unless the user chooses to explicitly of course! if __name__ == "__main__": main() # or call it test() if the file is only expected to be used as a module HTH, -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] __name__=='__main__'
On 20/02/12 23:46, Michael Lewis wrote: it inside my last function and the program ran. (side note, I have an error in my return for MultiplyText that I am still trying to work out, You can remove the outer for loop, you are already looping over text inside the generator expression. HTH, -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] ssh from Windows to a Solaris server
On 20/02/12 21:17, Do Nguyen (donguye) wrote:
command1 = "plink -ssh -pw myPassword myUserName@myServerIP"
p1 = subprocess.Popen(command1)
p2 = subprocess.Popen('ls')
I could verify that command1 was executed successfully, ie. the ssh to
myServer worked, but command2 was treated locally in the Windows
Yes, because you created a new subprocess.Popen object.
If you want to communicate with ssh in the first subprocess you need to
send commands to stdin on p1. There are lots of examples how to
read/write to stdin/out in the subprocess documentation. (I'm assuming
that plink stays open, I've never used it so don't know)
HTH
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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Re: [Tutor] __name__=='__main__'
Michael Lewis wrote: Error I got when __name == ' __main__' was outside of any function: Traceback (most recent call last): File "C:/Python27/Homework/Homework5_1.py", line 24, in if __name == '__main__': NameError: name '__name' is not defined You have misspelled __name__ as __name. -- Steven ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] __name__=='__main__'
On Mon, Feb 20, 2012 at 6:46 PM, Michael Lewis wrote: > I at first put it outside and after all my functions but got the error below That's the right place for it, you just spelled it wrong. > and then put it inside my last function and the program ran. That's not the right place for it. Your program ran, but only because nothing ever called your GetUserInput() function any more. > Traceback (most recent call last): > File "C:/Python27/Homework/Homework5_1.py", line 24, in > if __name == '__main__': > NameError: name '__name' is not defined It needs to be spelled "__name__" -- that's two underscores on each side. -- Jerry ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] __name__=='__main__'
Hi everyone,
I am having some trouble understanding how to use __name__== '__main__'.
Can you please give me some insight? Also, to use this, it needs to be
within a function? Do you typically just throw it in your very last
function or create a separate function just for this? I at first put it
outside and after all my functions but got the error below and then put it
inside my last function and the program ran. (side note, I have an error in
my return for MultiplyText that I am still trying to work out, so you can
ignore that part).
Code:
'''homework 5_1'''
def MultiplyText(text, multiplier):
'''Recieve a S. For digits in S, multiply by multiplier and return
updated S.'''
for num in text:
return ''.join(str(int(num) * multiplier) if num.isdigit() else num
for num in text)
def GetUserInput():
'''Get S & multiplier. Test multiplier.isdigit(). Call
MultiplyText(text, multiplier)'''
while True:
text = raw_input('Enter some text: ')
multiplier = raw_input('Enter a multiplier: ')
try:
multiplier.isdigit()
break
except ValueError:
continue
new_text = MultiplyText(text, multiplier)
return new_text
if __name == '__main__':
print GetUserInput()
Error I got when __name == ' __main__' was outside of any function:
Traceback (most recent call last):
File "C:/Python27/Homework/Homework5_1.py", line 24, in
if __name == '__main__':
NameError: name '__name' is not defined
--
Michael J. Lewis
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Re: [Tutor] arrays, while loops
El 20/02/12 13:42, Dave Angel escribió:
> I'm not sure who you are, but you forgot to include the list.
> Therefore I'll forward this to the list, and add my comments about
> your suggestions.
>
> On 02/20/2012 11:31 AM, Ricardo Araoz wrote:
>> Untested :
>> while True:
>> try:
>> amounts[index] = int (input ("Enter an amount: "))
>> amtinput = int (amounts)
>
> int() won't operate on a list. Probably you meant it to operate on a
> string, but there are no strings in it, it's a list of ints.
>
>
sorry I meant :
amtinput = int (input ("Enter an amount: "))
amounts[index] = amtinput
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Re: [Tutor] ssh from Windows to a Solaris server
> I’m a newbie in python programming …
>
> I wrote the followings to ssh from Windows to a Solaris server:
>
> command1 = "plink -ssh -pw myPassword myUserName@myServerIP"
> p1 = subprocess.Popen(command1)
> p2 = subprocess.Popen('ls')
>
> I could verify that command1 was executed successfully, ie. the ssh to
> myServer worked, but command2 was treated locally in the Windows and was not
> executed on the server.
As far as I know subprocess, you create a completely new shell environment
underneath for every process.
So essentially, you are now opening a shell, typing your ssh command, closing
the shell (and thus the ssh session), and then create a new shell to type 'ls'.
You can put the commands in a single shell script and run that through
subprocess.
With ssh, it could be somewhat easier:
>>> command1 = "plink -ssh -pw myPassword myUserName@myServerIP ls"
>>> p1 = subprocess.Popen(command1)
So, you can just put the command you want to run at the end of the ssh command.
But, I don't know if plink allows that: I simply don't know plink. If it
doesn't work this way, there may be an option for it though.
(Can't say I like the idea it lets you specify the password on the command
line, but hey.)
Cheers,
Evert
> The error was as follows:
>
> Traceback (most recent call last):
> File "C:\Python32\ProgramFiles\test-paramiko.py", line 42, in
> p2 = subprocess.Popen('ls')
> File "C:\Python32\lib\subprocess.py", line 741, in __init__
> restore_signals, start_new_session)
> File "C:\Python32\lib\subprocess.py", line 960, in _execute_child
> startupinfo)
> WindowsError: [Error 2] The system cannot find the file specified
>
> Any hint ? I am using python 3.2 and did try to install paramiko but could
> not make it works.
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[Tutor] ssh from Windows to a Solaris server
I'm a newbie in python programming ...
I wrote the followings to ssh from Windows to a Solaris server:
command1 = "plink -ssh -pw myPassword myUserName@myServerIP"
p1 = subprocess.Popen(command1)
p2 = subprocess.Popen('ls')
I could verify that command1 was executed successfully, ie. the ssh to
myServer worked, but command2 was treated locally in the Windows and was
not executed on the server. The error was as follows:
Traceback (most recent call last):
File "C:\Python32\ProgramFiles\test-paramiko.py", line 42, in
p2 = subprocess.Popen('ls')
File "C:\Python32\lib\subprocess.py", line 741, in __init__
restore_signals, start_new_session)
File "C:\Python32\lib\subprocess.py", line 960, in _execute_child
startupinfo)
WindowsError: [Error 2] The system cannot find the file specified
Any hint ? I am using python 3.2 and did try to install paramiko but
could not make it works.
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Re: [Tutor] What made Python differ from other Languages?
On 20/02/2012 16:43, Sunil Tech wrote: *I am Beginner (very little i know), i want to know what are new things i can find in Python.* ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor This sums up the Python philosophy. C:\Users\Mark\cpython\PCbuild>py -3.2 -c "import this" The Zen of Python, by Tim Peters Beautiful is better than ugly. Explicit is better than implicit. Simple is better than complex. Complex is better than complicated. Flat is better than nested. Sparse is better than dense. Readability counts. Special cases aren't special enough to break the rules. Although practicality beats purity. Errors should never pass silently. Unless explicitly silenced. In the face of ambiguity, refuse the temptation to guess. There should be one-- and preferably only one --obvious way to do it. Although that way may not be obvious at first unless you're Dutch. Now is better than never. Although never is often better than *right* now. If the implementation is hard to explain, it's a bad idea. If the implementation is easy to explain, it may be a good idea. Namespaces are one honking great idea -- let's do more of those! -- Cheers. Mark Lawrence. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] arrays, while loops
Thanks for your response. Please always reply-all so a copy goes to the
tutor list. I'm cc'ing this to that list.
On 2/19/2012 10:13 AM, Deborah Knoll wrote:
This is for a class - I wasn't trying to hide that fact. I didn't
want someone to write this for me,
I understand and appreciate that. I was commenting more to the other
list responders.
just give some help so I could learn, which I did get. As for this
being too advanced, it's a beginner Program Logic course and I think
the code is suppose to be written fairly simply
Something got derailed - the question you posed requires prior learning;
your attempts don't show that you had that learning.
- it's an online course which makes it harder but I am learning.
Would you provide a link to the course so we could see it?
I didn't know of your policy but from now on I will keep it to more
simple quesions instead of the whole program.
That's always a good idea. Your program wasn't that big. But there was
so much "wrong" with it - that made me question the relevance of the
assignment.
I do want to say thanks to everyone for the help - I'm excited to be
learning more.
I like hearing that. Please also note that we like to see our answers
interspersed with your comments. Please do the same when replying to us.
Also delete any part of the email to which you reply that is not
relevant to your reply. And please reply. We actually enjoy helping.
Some "generic" comments:
1) when working with a fixed-lengthobject (e.g.a list of length 7) start
by defining a constant and then refer to that constant. e.g.:
SIZE = 7
amounts = [0]*SIZE
2) when obtaining user input that should be a numberbut might not it is
essential that you (in one of several ways) anticipate and handle "bad"
input. One way is to use isdigit() to ensure that all the characters
entered are digits. This assumes that inputs with a decimal point are
not allowed, but your problem does not rule them out - it's just harder
to detect "bad" input if decimal points are allowed. So let's assume
integers only for now. Let's create a function whose job is to get an
integer and keep trying till the user enters one. We might as well throw
in the range check as this is the best place to do that.
def getInteger():
while True: # this keeps asking for in put until user get it right
x = raw_input ("Enter an integer amount between 1 and 1000: ") #
spell out all the requirements
if x.isdigit():
y = int(x)
if y >= 1 and y <= 1000:
return y
else:
print(x + " is not between 1 and 1000")
else:
print(x + " is not an integer")
print getInteger()
I wrote this as a stand-alone program so I could test it by itself, and
added the last line to actually run the test.
Once the getInteger function is working then you can add the other logic.
Another approach is using try and except as others have mentioned.
However I doubt whether your course has introduced exception handling.
--
Bob Gailer
919-636-4239
Chapel Hill NC
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Re: [Tutor] What made Python differ from other Languages?
I think python is great because: 1. it is very easy to read other peoples code and understand it 2. without being cryptic, you can do a lot of logic with very little typing because the language was well conceived -- it didn't get added on to in an ad hoc way that (IMO) php has been. 3. there is an active great community so you can learn about what you don't understand here or stack overflow, or meetups, etc. -- Joel Goldstick ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] What made Python differ from other Languages?
On 20/02/12 16:43, Sunil Tech wrote: /I am Beginner (very little i know), i want to know what are new things i can find in Python./ There is a wealth of detail on this on the Python web site. Try the FAQ for a starter: http://docs.python.org/faq/general.html And the success stories for more concrete evidence: http://www.python.org/about/success/ And for simple advocacy try: http://www.python.org/about/quotes/ HTH, -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] What made Python differ from other Languages?
On 02/20/2012 12:16 PM, Darin Lawson Hosking wrote: Sunil Here is great way to get started on Python, even though the first few videos are setting up a Linux virtual machine to develop within, he quickly moves onto Python. http://www.youtube.com/user/RaspberryPiTutorials/videos Darin The above was sent as a private email to me. And I wasn't even the one he apparently was addressing it to. -- DaveA ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] What made Python differ from other Languages?
Just to express my opinion on the matter which is cannot stress enough, Python does not only come with the kitchen sink, it comes with a very useful kitchen sink, most of the standard library modules are very useful and not just random additions, I take for example a comparision against C#, I had to process some XML files from email attachments, you cannot do this in C# out of the box (there is no pop3 or imap library, only XML handling), in python there is buildin pop3 module and xml processing, thus the time I invest on looking for a C# pop3 library (or creating my own) I already got it done with python and core modules, plus there is a standard way of searching, getting and installing modules which makes developing with python a bliss. To sum up, python is also different because there is a large amount of libraries and code to harness, making it easy to work with, fast to develop and flexible enough to cover different application types. Regards, Carlos Daniel Ruvalcaba Valenzuela ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] What made Python differ from other Languages?
On 02/20/2012 11:43 AM, Sunil Tech wrote: *I am Beginner (very little i know), i want to know what are new things i can find in Python.* There are thousands of computer languages out there. Nearly every feature has an analog out there somewhere. So "what's new" really depends on what language you're comparing it with. You said you're a beginner. Is that a beginner at Python, a beginner at programming, a beginner with computers, what? If I assume you're knowledgeable in C++, I'd point to this set of features: 1) No braces. You build program structure simply by proper indentation. 2) No declarations. A "variable" can contain an integer at one moment, and a dictionary of name/value pairs a moment later. The objects have the type, not the name. 3) Built in types for the most useful collections, tuple, list, dictionary, and set. And a large set of operations that can readily be done on them. 4) Duck typing. You can pass anything you like to a function, and the things you pass may not be subclasses of the expected types, but if the right operations (methods) are supported, it'll work. So you can define a "file like" object to a function that's expecting a file, and it doesn't have to be derived from file, it just has to have the right methods, and the equivalent semantics. 5) The kitchen sink. The standard library has an enormous collection of useful stuff, most of it written in python. Most of the time, you don't need to look to third party libraries to accomplish your goal. 6) Easy debugging. There are a number of IDE's available, but it's not hard to debug code without one. And you can run code fragments from a standard interpreter, and examine data and define new functions on the fly. The system also supports introspection, so even the simplest error message tells you a lot about what was happening. And when you need to, you can examine any object in the system, stack frames, types of objects, and so on. 7) Easy testing. You can define some sanity tests in your own source code, in a special string called a docstring. That string can thus have two uses: documentation for the reader of the code, and first line of tests to make sure the code meets those tests. -- DaveA ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] What made Python differ from other Languages?
*I am Beginner (very little i know), i want to know what are new things i can find in Python.* ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] arrays, while loops
I'm not sure who you are, but you forgot to include the list. Therefore
I'll forward this to the list, and add my comments about your suggestions.
On 02/20/2012 11:31 AM, Ricardo Araoz wrote:
El 20/02/12 00:00, Dave Angel escribió:
On 02/19/2012 07:01 PM, Deborah Knoll wrote:
A couple of side notes...
Here is my new code:
amounts = [0 for index in range (7)]
myamt = len(amounts)
myamt = 7
amounts = [0 for index in range(myamt)][0 for index in range(myamt)]
or even
amounts = [0] * myamt
def getnumbers():
for index in range(myamt):
amounts[index] = int (input ("Enter an amount: "))
amtinput = int (amounts)
while amtinput< 1 or amtinput> 1001:
print ("Try again")
amounts[index] = int (input ("Enter an amount: "))
amtinput = int (amounts)
amtinput.sort()
amtinput.reverse()
Untested :
while True:
try:
amounts[index] = int (input ("Enter an amount: "))
amtinput = int (amounts)
int() won't operate on a list. Probably you meant it to operate on a
string, but there are no strings in it, it's a list of ints.
except ValueError:
print ('Not an integer')
if 1<= amtinput<= 1001:
break
else:
print('Value must be between 1 and 1001')
--
DaveA
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