How to remove "\n" of a string in python3?

Question

if __name__ == '__main__':
    string =[' \n            Boeing Vancouver\n          ', '\n          Airbus\n        ', '\n          Lockheed Martin\n        ', '\n          Rolls-Royce\n        ', '\n          Northrop Grumman\n        ', '\n          BOMBARDIER\n        ', '\n          Raytheon\n        ']
    for item in string:
        item.replace("\n"," ")
        item.strip()
    print(string)

the output is the same as the input, why?

`[a.replace('\n',' ').strip() for a in string]` will give you a new modified list. — Sohaib Farooqi, Mar 21 '18 at 01:40
[Somewhat dupe](https://stackoverflow.com/questions/40444787/python-strip-method-not-working). — user202729, Mar 21 '18 at 01:44

score 0 · Answer 1 · answered Mar 21 '18 at 01:41

You need to review the documentation again:

Return a copy of the string with all occurrences of substring old replaced by new. If the optional argument count is given, only the first count occurrences are replaced.

In other words, item.replace("\n"," ") on its own does nothing.

score 0 · Answer 2 · answered Mar 21 '18 at 01:41

You can use a list comprehension like:

Code:

[s.replace("\n", " ") for s in a_string]

Test Code:

a_string = [' \n            Boeing Vancouver\n          ',
          '\n          Airbus\n        ',
          '\n          Lockheed Martin\n        ',
          '\n          Rolls-Royce\n        ',
          '\n          Northrop Grumman\n        ',
          '\n          BOMBARDIER\n        ',
          '\n          Raytheon\n        ']


print([s.replace("\n", " ") for s in a_string])

Results:

['              Boeing Vancouver           ', 
 '           Airbus         ', 
 '           Lockheed Martin         ', 
 '           Rolls-Royce         ', 
 '           Northrop Grumman         ', 
 '           BOMBARDIER         ', 
 '           Raytheon         ']

Rahul · Accepted Answer · 2018-03-21T01:53:12.393

0

String are imutable in python. You can simply strip the leading or trailing whitespaces using list comprehension to make new list.

[x.strip() for x in string]

edited Mar 21 '18 at 01:53

answered Mar 21 '18 at 01:47

Rahul

10,830
4
53
88

On mobile pleaae mind the errors. – Rahul Mar 21 '18 at 01:48

How to remove "\n" of a string in python3?

3 Answers3

Code:

Test Code:

Results: