[Baypiggies] python list manipulation using map

[Tung Wai Yip]

Just use map(int, x).

- map is functional construct.

- For loop and list comprehension is procedural construct.

In this case functional construct is lot more concise.


Wai Yip



> i have a list whose elements are strings. all the elements in the list  
> are
> numbers but are represented as string type and i wish to convert them to  
> int
> type. i tried using map but the output is not what i want. please help.
>
>  x = ['0', '0', '20', '15', '42', '0', '0', '0', '0', '0', '0', '0', '0',
> '52', '57', '0', '254', '0', '177', '0', '617', '1021979']
>
>>>> T2 = [map(int, i) for i in x]
>>>> T2
> [[0], [0], [2, 0], [1, 5], [4, 2], [0], [0], [0], [0], [0], [0], [0],  
> [0],
> [5, 2], [5, 7], [0], [2, 5, 4], [0], [1, 7, 7], [0], [6, 1, 7], [1, 0,  
> 2, 1,
> 9, 7, 9]]
>
> ----------