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Re: Is there any difference between print 3 and print '3' in Python ?

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  Re: Is there any difference between print 3 and print '3' in Python ? iMath <redstone-cold@163.com> - 2012-09-09 06:23 -0700
    Re: Is there any difference between print 3 and print '3' in Python ? Ian Foote <ian@feete.org> - 2012-09-09 15:41 +0100
    Re: Is there any difference between print 3 and print '3' in Python ? Benjamin Kaplan <benjamin.kaplan@case.edu> - 2012-09-09 23:55 -0700
    Re: Is there any difference between print 3 and print '3' in Python ? Terry Reedy <tjreedy@udel.edu> - 2012-09-10 03:16 -0400

#28769 — Re: Is there any difference between print 3 and print '3' in Python ?

在 2012年3月26日星期一UTC+8下午7时45分26秒，iMath写道：
> I know the print statement produces the same result when both of these two instructions are executed ,I just want to know Is there any difference between print 3 and print '3' in Python ?

thx everyone

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#28781

On 09/09/12 14:23, iMath wrote:
> 在 2012年3月26日星期一UTC+8下午7时45分26秒，iMath写道：
>> I know the print statement produces the same result when both of these two instructions are executed ,I just want to know Is there any difference between print 3 and print '3' in Python ?
> thx everyone

The difference is that 3 is an integer whereas '3' is a string. The 
print statement (function in python 3) converts any object to a string 
before displaying it on the screen, so print 3 and print '3' both 
display the same result.

Ian F

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#28804

On Sun, Sep 9, 2012 at 11:33 PM, Dwight Hutto <dwightdhutto@gmail.com> wrote:
>
>
> On Sun, Sep 9, 2012 at 10:41 AM, Ian Foote <ian@feete.org> wrote:
>>
>> On 09/09/12 14:23, iMath wrote:
>>>
>>> 在 2012年3月26日星期一UTC+8下午7时45分26秒，iMath写道：
>>>>
>>>> I know the print statement produces the same result when both of these
>>>> two instructions are executed ,I just want to know Is there any difference
>>>> between print 3 and print '3' in Python ?
>>>
>>> thx everyone
>>
>>
>
> Here's a future import though I used,so I can use the planned 3 with a 2x
> python version in the command line interpreter:
>
> Microsoft Windows [Version 6.1.7600]
> Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
>
> C:\Users\david>c:\python26\python.exe
> Python 2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 bit (Intel)]
> on
> win32
> Type "help", "copyright", "credits" or "license" for more information.
>>>> exit()
>
> C:\Users\david>c:\python27_64\python.exe
> Python 2.7.2 (default, Jun 12 2011, 14:24:46) [MSC v.1500 64 bit (AMD64)] on
> win
> 32
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import __future__
>>>> x = 3
>>>> y = '3'
>>>> print(x)
> 3
>>>> print(y)
> 3
>>>>
>>>> type(x)
> <type 'int'>
>>>> type(y)
> <type 'str'>
>
>>>> z = '%i' % (3)
>>>> type(z)
> <type 'str'>
>>>>
>
> In other words type(value), and find out the difference.
> --
> Best Regards,
> David Hutto
> CEO: http://www.hitwebdevelopment.com
>

Somewhat OT, but __future__ doesn't work like that. You have to import
the specific features you want to use.

Python 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)] on win
32
Type "help", "copyright", "credits" or "license" for more information.
>>> print 3
3
>>> import __future__
>>> print 3
3
>>> from __future__ import print_function
>>> print 3
  File "<stdin>", line 1
    print 3
          ^
SyntaxError: invalid syntax

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#28806

On 9/10/2012 2:33 AM, Dwight Hutto wrote:
>
>
> On Sun, Sep 9, 2012 at 10:41 AM, Ian Foote <ian@feete.org
> <mailto:ian@feete.org>> wrote:
>
>     On 09/09/12 14:23, iMath wrote:
>
>         在 2012年3月26日星期一UTC+8下午7时45分26秒，__iMath写道：
>
>             I know the print statement produces the same result when
>             both of these two instructions are executed ,I just want to
>             know Is there any difference between print 3 and print '3'
>             in Python ?
>
>         thx everyone
>
>
> Here's a future import though I used,so I can use the planned 3 with a
> 2x python version in the command line interpreter:
>
> Microsoft Windows [Version 6.1.7600]
> Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
>
> C:\Users\david>c:\python26\python.exe
> Python 2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 bit
> (Intel)] on
> win32
> Type "help", "copyright", "credits" or "license" for more information.
>  >>> exit()
>
> C:\Users\david>c:\python27_64\python.exe
> Python 2.7.2 (default, Jun 12 2011, 14:24:46) [MSC v.1500 64 bit
> (AMD64)] on win
> 32
> Type "help", "copyright", "credits" or "license" for more information.
>  >>> import __future__
>  >>> x = 3
>  >>> y = '3'
>  >>> print(x)
> 3
>  >>> print(y)
> 3
>  >>>
>  >>> type(x)
> <type 'int'>
>  >>> type(y)
> <type 'str'>
>
>  >>> z = '%i' % (3)
>  >>> type(z)
> <type 'str'>
>  >>>
>
> In other words type(value), and find out the difference.

print(x) prints str(x), which is meant to be a 'friendly' 
representation. To see a difference,

 >>> print(repr(3))
3
 >>> print(repr('3'))
'3'

-- 
Terry Jan Reedy

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