[Tutor] newbie map help

[karthik Guru]

thanks!

i got this one to work.

map(lambda line: string.split(line,","),lines)

Obviously every line in lines is getting passed as a parameter to the
anonymous function.

karthik.


-----Original Message-----
From: Glen Wheeler [mailto:wheelege@tsn.cc]
Sent: Monday, November 19, 2001 3:33 PM
To: karthik Guru; tutor@python.org
Subject: Re: [Tutor] newbie map help


  Howdy how,

  > how do i use map here??

  Well map takes a function and something to iterate over, then returns a
list.  The problem here is that we need a function that will split a string
with the seperator ",".  As you may have already realised, such a function
is string.split(lines[x], ","), where x is the index number of the list
lines.
  Now you just need something to iterate over, and in this case you want a
bunch of index numbers - range(len(list)) should do fine.
  So we have...

map(lambda x:string.split(lines[x], ","), range(len(lines)))

  Which works fine.  However it looks ugly, and I have somewhat unskillfully
dodged any explanation of lambda...which is deliberate - I will probably end
up confusing you even more :)  Basically it creates a function which can be
passed as an argument to other things, very useful.
  Anywho, there is probably a much cleaner and more elegant way of doing
this, but that is the one I came up with,

  HTH,
  Glen


>
> import string
> map(string.split, lines) ==> This s'd return me a list of lists.
>
> [["how","are","you","doing"],["ok fine"]..]
>
> How do i specify the separator character to the split function in map?
>
> thanks in advance,
> karthik
>
>
>
>
>
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