Re: [BangPypers] Issue with list comprehension

[Abdul Muneer]

Hi,
_sum=sum([n for n in itertools.takewhile(lambda x: x  400, fib)])
TypeError: 'int' object is not callable

Probably 'sum' might have been used earlier in the code to store the value
of some integer. sum is a builtin function but the moment you assign
sum=(x+y) or something, you have lost that function. If you are doubtful,
do `from __builtin__ import * ` to reclaim your builtin variables and
functions.

Regards,
Abdul Muneer

--
Follow me on Twitter: @abdulmuneer http://twitter.com/#%21/abdulmuneer


On Thu, Oct 31, 2013 at 12:22 PM, Asokan Pichai paso...@gmail.com wrote:

 import itertools

 def fib():
   a, b = 0, 1
   while True:
   yield b
   a, b = b, a+b

 print sum(itertools.takewhile(lambda x: x  400, fib))
 ---
 I tried the above; and it worked too (986)

 Asokan Pichai
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Re: [BangPypers] Issue with list comprehension

[Asokan Pichai]

import itertools

def fib():
  a, b = 0, 1
  while True:
  yield b
  a, b = b, a+b

print sum(itertools.takewhile(lambda x: x  400, fib))
---
I tried the above; and it worked too (986)

Asokan Pichai
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[BangPypers] Issue with list comprehension

[Anant TECHIE]

Hi folks,

I am new to Python (have been on Java for 8 years), but I have quickly
grasped its style.

While working on a problem (as Python practice) to generate fibonacci
numbers using generators and list comprehension, I ran into an issue.

Here's my code:

*import itertools*
*
*
*def fibonacci():*
*a, b = 0, 1*
*while True:*
* yield b*
* a, b = b, a+b*
*
*
*fib=fibonacci()
*
*_sum=sum([n for n in itertools.takewhile(lambda x: x  400, fib)])*
*print _sum*

Basically, I wanted to sum up all the fib numbers till 400.
*This code runs fine when run on REPL (shell). But when I run it*
*as a script, i get following error:*

Traceback (most recent call last):
  File 2.py, line 10, in module
_sum=sum([n for n in itertools.takewhile(lambda x: x  400, fib)])
TypeError: 'int' object is not callable


 Python version: 2.7.3

Is there a bug in Python or am I missing something? Why does this only work
in REPL
and not as shell script?

Thanks for help.

Cheers,
Anant
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Re: [BangPypers] Issue with list comprehension

[Dhananjay Nene]

Thats surprising. The code runs just fine

http://ideone.com/06qjoM

(Ans: 986)

As an aside I renamed _sum to sum_

When avoiding naming conflicts, its recommended to postfix a underscore

Prefixing an underscore is to provide a hint that the value that gets
assigned to the variable is going to be ignore (ie. that variable
itself is going to be ignored)

Dhananjay


On Wed, Oct 30, 2013 at 5:42 PM, Anant TECHIE anant.tec...@gmail.com wrote:
 Hi folks,

 I am new to Python (have been on Java for 8 years), but I have quickly
 grasped its style.

 While working on a problem (as Python practice) to generate fibonacci
 numbers using generators and list comprehension, I ran into an issue.

 Here's my code:

 *import itertools*
 *
 *
 *def fibonacci():*
 *a, b = 0, 1*
 *while True:*
 * yield b*
 * a, b = b, a+b*
 *
 *
 *fib=fibonacci()
 *
 *_sum=sum([n for n in itertools.takewhile(lambda x: x  400, fib)])*
 *print _sum*

 Basically, I wanted to sum up all the fib numbers till 400.
 *This code runs fine when run on REPL (shell). But when I run it*
 *as a script, i get following error:*

 Traceback (most recent call last):
   File 2.py, line 10, in module
 _sum=sum([n for n in itertools.takewhile(lambda x: x  400, fib)])
 TypeError: 'int' object is not callable


  Python version: 2.7.3

 Is there a bug in Python or am I missing something? Why does this only work
 in REPL
 and not as shell script?

 Thanks for help.

 Cheers,
 Anant
 ___
 BangPypers mailing list
 BangPypers@python.org
 https://mail.python.org/mailman/listinfo/bangpypers
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