Efficient way to add spaces between characters in a string

Question

Say I have a string s    BINGO   I want to iterate over the string to produce  B I N G O    This is what I did   result      for ch in s     result   result   ch       print result  -1        to rid of space after O   Is there a more efficient way to go about this

User · Answer

A very pythonic and practical way to do it is by using the string join() method:

str.join(iterable)

The official Python documentations says:

Return a string which is the concatenation of the strings in iterable... The separator between elements is the string providing this method.

How to use it?

Remember: this is a string method.

This method will be applied to the str above, which reflects the string that will be used as separator of the items in the iterable.

Let's have some practical example!

iterable = "BINGO"
separator = " " # A whitespace character.
                # The string to which the method will be applied
separator.join(iterable)
> 'B I N G O'

In practice you would do it like this:

iterable = "BINGO"    
" ".join(iterable)
> 'B I N G O'

But remember that the argument is an iterable, like a string, list, tuple. Although the method returns a string.

iterable = ['B', 'I', 'N', 'G', 'O']    
" ".join(iterable)
> 'B I N G O'

What happens if you use a hyphen as a string instead?

iterable = ['B', 'I', 'N', 'G', 'O']    
"-".join(iterable)
> 'B-I-N-G-O'

User · Answer

s    BINGO  print     join s     Should do it

User · Answer

The most efficient way is to take input make the logic and run so the code is like this to make your own space maker need   input  quot Write a string -  quot   result      for character in need     result   result   character       print result       to rid of space after O  but if you want to use what python give then use this code need2   input  quot Write a string -  quot    print  quot   quot  join need2

User · Answer

s    BINGO  print s replace          1  -1     Timings below    python -m timeit -s s    BINGO    s replace         1 -1   1000000 loops  best of 3  0 584 usec per loop   python -m timeit -s s    BINGO        join s   100000 loops  best of 3  1 54 usec per loop

[python] Efficient way to add spaces between characters in a string

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