1000 Python Examples by Gábor Szabó

Author:Gábor Szabó [Gábor Szabó]
Language: eng
Format: epub, mobi, pdf
Publisher: leanpub.com
Published: 2020-01-02T00:00:00+00:00

1 <map object at 0x7f90df760f98> 2 double 1 3 2 4 double 4 5 8 6 double 2 7 4 8 double -1 9 -2

map on many values

Now imagine you have a very long list. I know this is not such a long list, but I trust you can imagin a long list of numbers. We would like to run

some function on each element and then iterate over the results, but what if at one point in the iteration we decide to break out of the loop?

1 import sys 2 3 def double(n): 4 print(f"double {n}") 5 return 2 * n 6 7 numbers = [1, 4, 2, -1, 23, 12, 5, 6, 34, 143123, 98, 213] 8 9 double_numbers = map(double, numbers) 10 print(double_numbers) 11 for num in double_numbers: 12 print(num) 13 if num > 42: 14 break 15 16 print() 17 print(sys.getsizeof(numbers)) 18 print(sys.getsizeof(double_numbers))

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