Re: [Tutor] syntax error with raw input

2014-11-12 Thread Chris Warrick 
On Wed, Nov 12, 2014 at 12:08 PM, Vaibhav Banait
careendosc...@gmail.com wrote:
 Hi
 I am new to python. I learnt (!) using  raw_input a day back. Attempt to use
 has resulted in error. I am not able to spot a problem in syntax. I am using
 python 3.4.2. Kindly help


 a = raw_input(Write down your name: )

 Output:


 Traceback (most recent call last):
   File pyshell#1, line 1, in module
 a = raw_input(Write down your name: )
 NameError: name 'raw_input' is not defined

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In Python 3, raw_input() was renamed to input().

a = input(Write down your name: )

Note that input() is also a thing in Python 2, but you shouldn’t use
that one for security reasons.  Python 3’s is fine though.

-- 
Chris Warrick https://chriswarrick.com/
PGP: 5EAAEA16
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Re: [Tutor] syntax error with raw input

2014-11-12 Thread Alan Gauld 

On 12/11/14 11:08, Vaibhav Banait wrote:

Hi
I am new to python. I learnt (!) using  raw_input a day back. Attempt to
use has resulted in error. I am not able to spot a problem in syntax. I
am using python 3.4.2. Kindly help


Looks like you are reading a v2 book/tutorial but using v3.

In v3 several key changes were made to Python including the renaming of 
raw_input() to input().


The other big change was making print a function so you now *must* put 
parentheses around anything you want to print.


ie

print 'hello'  # Python v2

becomes

print('hello')   # python v3

There are numerous other small changes so it would be better for you to 
either find a v3 tutorial (you could try mine! :-) or install Python 
v2.7 while you are learning.



--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.flickr.com/photos/alangauldphotos

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Re: [Tutor] syntax error with raw input

2014-11-12 Thread wesley chun 
Slightly hijacking this thread a bit, specifically Alan's reply, if anyone
is averse to installing multiple versions of Python on their computers, you
can always access a Python interpreter from a browser window.

Here are a collection I've put together. Most are Python 2, but the top
pair also support Python 3:

   - http://ideone.com (2.x  3.x)
   - http://colabv6.dan.co.jp/lleval.html (2.x  3.x)
   - http://doc.pyschools.com/console
   - http://repl.it/languages/Python
   - http://skulpt.org (pure JS implementation; allows turtle)
   - http://pythonwebconsole.thomnichols.org
   - http://shell.appspot.com (Google App Engine + libraries)
   - http://codepad.org
   - http://lotrepls.appspot.com
   - http://datamech.com/devan/trypython/trypython.py

Cheers,
--Wesley

On Wed, Nov 12, 2014 at 9:11 AM, Alan Gauld alan.ga...@btinternet.com
wrote:

 On 12/11/14 11:08, Vaibhav Banait wrote:

 Hi
 I am new to python. I learnt (!) using  raw_input a day back. Attempt to
 use has resulted in error. I am not able to spot a problem in syntax. I
 am using python 3.4.2. Kindly help


 Looks like you are reading a v2 book/tutorial but using v3.

 In v3 several key changes were made to Python including the renaming of
 raw_input() to input().

 The other big change was making print a function so you now *must* put
 parentheses around anything you want to print.

 ie

 print 'hello'  # Python v2

 becomes

 print('hello')   # python v3

 There are numerous other small changes so it would be better for you to
 either find a v3 tutorial (you could try mine! :-) or install Python v2.7
 while you are learning.


 --
 Alan G
 Author of the Learn to Program web site
 http://www.alan-g.me.uk/
 http://www.flickr.com/photos/alangauldphotos


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-- 
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
A computer never does what you want... only what you tell it.
+wesley chun http://google.com/+WesleyChun : wescpy at gmail : @wescpy
http://twitter.com/wescpy
Python training  consulting : http://CyberwebConsulting.com
Core Python books : http://CorePython.com
Python blog: http://wescpy.blogspot.com
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Re: [Tutor] syntax error with raw input

2014-11-12 Thread Steven D'Aprano 
On Wed, Nov 12, 2014 at 04:38:51PM +0530, Vaibhav Banait wrote:
 Hi
 I am new to python. I learnt (!) using  raw_input a day back. Attempt to
 use has resulted in error. I am not able to spot a problem in syntax.

What makes you think it is a problem with syntax?

This is what happens when you have a syntax error:

py 23 42 +
  File stdin, line 1
23 42 +
^
SyntaxError: invalid syntax


Look at the error you get instead: it doesn't say SyntaxError, does 
it? It says NameError.

NameError: name 'raw_input' is not defined


The reason is that in Python 3, raw_input has been renamed to just 
input.



-- 
Steven
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