Converting string to an int array using map

Question

Reading Python - converting a string of numbers into a list of int I'm attempting to convert string '011101111111110' to an array of ints : [0,1,1,1,0,1,1,1,1,1,1,1,1,1,0]

Here is my code :

mystr = '011101111111110'
list(map(int, mystr.split('')))

But returns error :

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-54-9b0dca2f0819> in <module>()
      1 mystr = '011101111111110'
----> 2 list(map(int, mystr.split('')))

ValueError: empty separator

How to split the string that has an empty splitting separator and convert result to an int array ?

Possible duplicate of [How to split string without spaces into list of integers in Python?](https://stackoverflow.com/questions/29409273/how-to-split-string-without-spaces-into-list-of-integers-in-python) — DavidG, Nov 09 '17 at 22:02

Daniel · Accepted Answer · 2017-11-09T22:02:27.027

8

list(map(int, list(mystr)))

Should do the job. You can't split on an empty string, but Python supports casting str to list as a built-in. I wouldn't use map for situations like these though, but instead use a list comprehension:

[int(x) for x in mystr]

edited Nov 09 '17 at 22:02

answered Nov 09 '17 at 22:00

Daniel

769
8
21

2

you don't even have to convert to a list first. `mystr` is already iterable. So: `list(map(int, mystr))` – Marcus Müller Nov 09 '17 at 22:01
nice, I was about to post an answer with the list comprehension, but with your edit, I'll just upvote your answer instead! – Marcus Müller Nov 09 '17 at 22:03
Given @MarcusMüller's comment why do you not correct your answer to `list(map(int, mystr))`? – Steven Rumbalski Nov 09 '17 at 22:22
@StevenRumbalski Since that would invalidate the comment. – Daniel Nov 09 '17 at 22:23
@StevenRumbalski That's a concern for meta. The comment is prominent and I prefer not editing my answer now. Feel free to add a new answer. – Daniel Nov 09 '17 at 22:27

score 3 · Answer 2 · answered Nov 09 '17 at 22:09

3

You don't need to split your string as it is already iterable. For instance:

mystr = '011101111111110'
result = list(map(int, mystr))

print(result) # will print [0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0]

answered Nov 09 '17 at 22:09

Andronnix

39
3

How is this different from the other answer? – DavidG Nov 09 '17 at 22:09
1

@DavidG: It doesn't include the unnecessary `list(mystr)` which is a major improvement. The other answer acts as if strings are not iterable. – Steven Rumbalski Nov 09 '17 at 22:12

Converting string to an int array using map

2 Answers2