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Date: Wed, 11 Jul 2012 20:39:45 -0700 (PDT)
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Subject: Re: lambda in list comprehension acting funny
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Xref: csiph.com comp.lang.python:25191

On Thursday, July 12, 2012 12:34:33 AM UTC+8, Ian wrote:
> On Wed, Jul 11, 2012 at 4:28 AM, Colin J. Williams &lt;cjw@ncf.ca&gt; wrote:
> &gt; I don&#39;t understand why you would expect 1, 2, 4.
> 
> Because:
> 
> funcs[0](2) == 2 ** 0 == 1
> funcs[1](2) == 2 ** 1 == 2
> funcs[2](2) == 2 ** 2 == 4
> 
> &gt; Perhaps parentheses will help the order of evaluation:
> &gt;
> &gt; funcs = [(lambda x: x**i) for i in range( 5 )]
> &gt;
> &gt; This gives:
> &gt; 1
> &gt; 16
> &gt; 81
> 
> No, that gives 16, 16, 16 just like the original.  I don&#39;t understand
> why you would expect 1, 16, 81, unless you have misread the code.

I'll contribute my way of python programming:

def powerb(x, b): # 
     return x**b


One functor is enough!