How to remove spaces from lists in lists [python]

Question

The file contains:

output: [[3],[7,4],[2,4,6],[8,5,9,3]]

my output:

 [[3], [7, 4], [2, 4, 6], [8, 5, 9, 3]]    
      ^       ^          ^             // don't want these spaces

my solution:

def read_triangle(filename):
    f = open(filename,'r')
    triangle = []
    for line in f:
        splited = line.split()
        triangle.append([])
        for num in splited:
            triangle[-1].append(int(num))           
    f.close()
    return triangle

what do i have to do to remove spaces?

my output: [[3], [7, 4], [2, 4, 6] : (there is a space between each index and inside the index it self. but the output must be without any space. — Hala Twin, Oct 23 '16 at 13:38
It's exactly the same list. Are you absolutely sure you're required to print it all scrunched up like that? — TigerhawkT3, Oct 23 '16 at 13:39
How are you printing the list? Are you using `print(read_triangle(filename))` — Bhargav Rao, Oct 23 '16 at 13:41
@HalaTwin This has nothing to do with the list itself. It had everything to do with how it's printed by default. — Carcigenicate, Oct 23 '16 at 13:41
Could you show how you output the list to the file? `list`s in Python should not randomly space their output. — BrandonM, Oct 23 '16 at 13:44
@HalaTwin How are you printing the list though? Are you using `print`? Or are you evaluating it in a REPL? — Carcigenicate, Oct 23 '16 at 13:46
The correct out put and my output are not the same, My out put contains spaces, and i need to get rid of them . i just can figute out how, i tried a lot of thing but it doesnt work. — Hala Twin, Oct 23 '16 at 13:46
@HalaTwin You need to provide us an [MCVE]. It's completely unclear as to how you are printing a list. If you are using the REPL directly and calling the function, then use `.replace` method. See http://stackoverflow.com/questions/8270092/python-remove-all-whitespace-in-a-string. Voting to close the post as unclear — Bhargav Rao, Oct 23 '16 at 13:50
@TigerhawkT3 not sure but i have used split and did give me these spaces in output when input number series had no spaces — Pavneet_Singh, Oct 23 '16 at 13:50
@BhargavRao yeah you are right , i used 'split(',')' , seems like something subtle issue — Pavneet_Singh, Oct 23 '16 at 13:55

score 1 · Answer 1 · answered Oct 23 '16 at 13:45

1

Your output is fine. You have the correct list. The required output only appears without spaces because whoever typed it was too lazy to hit the spacebar (I'm guilty of that from time to time, as well). You could get that output with str(result).replace(' ', ''), but, again, it is not necessary. The Python interpreter's default representation of a list object simply includes spaces for readability.

Nothing is wrong.

answered Oct 23 '16 at 13:45

TigerhawkT3

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I tried str(result).replace(' ', ''), but still didn't work cuz I have a list in a list . – Hala Twin Oct 23 '16 at 13:55
@HalaTwin - `result = [[3],[7,4],[2,4,6],[8,5,9,3]]; str(result).replace(' ', '')` produces `'[[3],[7,4],[2,4,6],[8,5,9,3]]'` for me. – TigerhawkT3 Oct 23 '16 at 13:58
I keep getting this Error: File "C:\Users\user\Desktop\python\python.py", line 11, in read_triangle return str(result.replace(' ','')) AttributeError: 'list' object has no attribute 'replace' – Hala Twin Oct 23 '16 at 14:07
seems like wired OP requirement , agree user don't need it , 1 – Pavneet_Singh Oct 23 '16 at 14:08
@HalaTwin - You are misplacing the parentheses. Reread and try again. – TigerhawkT3 Oct 23 '16 at 14:10

How to remove spaces from lists in lists [python]

1 Answers1