[Tutor] Explanation of this lambda
Johan Geldenhuys
johan at accesstel.co.za
Thu Feb 22 11:43:38 CET 2007
Thanks, Alan.
That makes it a lot easier to understand. I'll play around with other
examples to see what it is doing.
Johan
-----Original Message-----
From: tutor-bounces at python.org [mailto:tutor-bounces at python.org] On Behalf
Of Alan Gauld
Sent: 22 February 2007 11:46 AM
To: tutor at python.org
Subject: Re: [Tutor] Explanation of this lambda
"Johan Geldenhuys" <johan at accesstel.co.za> wrote
> Would somebody care to explain what is happening in this process?
>
> def intToBin(self, x, count=8):
> return "".join(map(lambda y:str((x>>y)&1), range(count-1, -1,
> -1)))
"".join() turns a list into a string
map() returns a list where each item is the result of applying the lambda to
the range()
lamda y: ..... is a function to be applied
str() converts to a string
x>>y shifts the bits of x right by y places 010 -> 001
& 1 bitwise ands with 1 which returns 1 if the last bit is one.
put the bits together and it should be clear.
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.freenetpages.co.uk/hp/alan.gauld
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