List Comprehensions
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A list comprehension provides a compact way of mapping a list into another list by applying a function to each of the elements of the list.
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a_list = [1, 9, 8, 4]print ([elem * 2 for elem in a_list] ) #①#[2, 18, 16, 8]print (a_list) #②#[1, 9, 8, 4]a_list = [elem * 2 for elem in a_list] #③print (a_list)#[2, 18, 16, 8]
① To make sense of this, look at it from right to left. a_list is the list you’re mapping. The Python interpreter loops through a_list one element at a time, temporarily assigning the value of each element to the variable elem. Python then applies the function elem * 2 ...
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