Eliminating a white spaces from a string except for end of the string-CodePudding

I want to eliminate white spaces in a string except for end of the string

code:

sentence = ['He must be having a great time/n                           ', 'It is fun to play chess      ', 'Sometimes TT is better than Badminton             ']
pattern = "\s ^[\s $]"
res = [re.sub(pattern,', ', line) for line in sentence]

print(res)

But...

output is same input list.

['He must be having a great time/n                           ', 'It is fun to play chess      ', 'Sometimes TT is better than Badminton             ']

Can anyone suggest the right solution.

code:

sentence = ['He must be having a great time                           ', 'It is fun to play chess      ', 'Sometimes TT is better than Badminton             ']
pattern = "\s ^[\s $]"
res = [re.sub(pattern,', ', line) for line in sentence]

print(res)

But...

output is same input list.

['He must be having a great time/n                           ', 'It is fun to play chess      ', 'Sometimes TT is better than Badminton             ']

expected output:

['He,must,be,having,a,great,time', 'It,is,fun,to,play,chess', 'Sometimes,TT,is,better,than,Badminton ']

CodePudding user response：

We can first strip off leading/trailing whitespace, then do a basic replacement of space to comma:

import re

sentence = ['He must be having a great time\n                           ', 'It is fun to play chess      ', 'Sometimes TT is better than Badminton             ']
output = [re.sub(r'\s ', ',', x.strip()) for x in sentence]
print(output)

This prints:

['He,must,be,having,a,great,time',
 'It,is,fun,to,play,chess',
 'Sometimes,TT,is,better,than,Badminton']

CodePudding user response：

You can use a simpler split/join method (timeit: 1.48 µs ± 74 ns).

str.split() will split on groups of whitespace characters (space or newline for instance).

str.join(iter) will join the elements of iter with the str it is used on.

Demo:

sentence = [
    "He must be having a great time\n                           ",
    "It is fun to play chess      ",
    "Sometimes TT is better than Badminton             ",
]
[",".join(s.split()) for s in sentence]

gives

['He,must,be,having,a,great,time',
 'It,is,fun,to,play,chess',
 'Sometimes,TT,is,better,than,Badminton']

Second method, strip/replace (timeit: 1.56 µs ± 107 ns).

str.strip() removes all whitespace characters at the beginning and then end of str.

str.replace(old, new) replaces all occurences of old in str with new (works because you have single spaces between words in your strings).

Demo:

sentence = [
    "He must be having a great time\n                           ",
    "It is fun to play chess      ",
    "Sometimes TT is better than Badminton             ",
]

[s.strip().replace(" ", ",") for s in sentence]

gives

['He,must,be,having,a,great,time',
 'It,is,fun,to,play,chess',
 'Sometimes,TT,is,better,than,Badminton']

CodePudding user response：

def eliminating_white_spaces(list):
for string in range(0,len(list)):
    if ' ' in list[string] and string 1==len(list):
        pass
    else:  
        list[string]=str(list[string]).replace(' ',',')
return list