How do I convert a space separated integer input into a list of integers?
Example input:
list1 = list(input("Enter the unfriendly numbers: "))
Example conversion:
['1', '2', '3', '4', '5'] to [1, 2, 3, 4, 5]
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7 Answers
map() is your friend, it applies the function given as first argument to all items in the list.
map(int, yourlist)
since it maps every iterable, you can even do:
map(int, input("Enter the unfriendly numbers: "))
which (in python3.x) returns a map object, which can be converted to a list.
I assume you are on python3, since you used input, not raw_input.
3 Comments
Rob I
+1 but did you mean
map(int,yourlist) ?
quodlibetor
do you mean
map(int, input().split()), or does py3k automatically convert space-separated input into a list?
ch3ka
no, I assumed that the digits are entered without whitespace, as the provided example suggests. In fact, I did not post this as a solution, I just wanted to point out that the second argument to map() does not have to be a list, any iterable works.
this works:
nums = [int(x) for x in intstringlist]
Comments
You can try:
x = [int(n) for n in x]
4 Comments
Matt Fenwick
This doesn't work.
int is not a method on strings.
Silviu
Sorry I edited it... This is actually what I meant :)
Matt Fenwick
It's not wrong, but I generally wouldn't reuse
x like that.Silviu
Can you give me an example why?
Say there is a list of strings named list_of_strings and output is list of integers named list_of_int. map function is a builtin python function which can be used for this operation.
'''Python 2.7'''
list_of_strings = ['11','12','13']
list_of_int = map(int,list_of_strings)
print list_of_int
Comments
l=['1','2','3','4','5']
for i in range(0,len(l)):
l[i]=int(l[i])
Comments
Just curious about the way you got '1', '2', '3', '4' instead of 1, 2, 3, 4. Anyway.
>>> list1 = list(input("Enter the unfriendly numbers: "))
Enter the unfriendly numbers: 1, 2, 3, 4
>>> list1 = list(input("Enter the unfriendly numbers: "))
Enter the unfriendly numbers: [1, 2, 3, 4]
>>> list1
[1, 2, 3, 4]
>>> list1 = list(input("Enter the unfriendly numbers: "))
Enter the unfriendly numbers: '1234'
>>> list1 = list(input("Enter the unfriendly numbers: "))
Enter the unfriendly numbers: '1', '2', '3', '4'
>>> list1
['1', '2', '3', '4']
Alright, some code
>>> list1 = input("Enter the unfriendly numbers: ")
Enter the unfriendly numbers: map(int, ['1', '2', '3', '4'])
>>> list1
[1, 2, 3, 4]