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Question

I want to avoid doing ugly int to each element in a list.

dictionary[l[0]] = [(int(l[1])+ int(l[2])+ int(l[3]))/3] #avg score of 3 grades
    sub1 += int(l[1])
    sub2 += int(l[2])
    sub3 += int(l[3])

The list l has 4 elements, 0 to 3 indexes. I need to apply int starting with the 1st-element, not 0th element.

I'm trying to write something like:

map lambda x: int(x) for i in l[1:]

Do I need lambda here, since map can already do the job?

Answer

map calls a function on each element of a list. Since int is a function you can use

map(int, lst)

directly.

Lambda functions just give you more flexibility, say if you wanted to do:

map(lambda x: 5*int(x), lst)

A more Pythonic way to do the above would be to use list comprehensions

[int(x) for x in lst]
[5*int(x) for x in lst]

In Python3 map returns a generator. If you wish to have a list, you'd want to do:

list(map(int, lst))