str.replace() when str contains \

[Thomas Passin]

Better to use raw strings whenever backslashes are involved.

On 10/29/2022 2:21 PM, Bernard LEDRU wrote:
> Hello,
> 
> https://docs.python.org/3/library/stdtypes.html#string-methods
> 
> str.replace(old, new[, count])¶
> 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.
> 
> Attention when the string contains the escape character.
> 
> Consider :
> 
>>>> a="H:\2023"; print(a.replace("\\","/"))
> H:3
>>>> a="H:\a2023"; print(a.replace("\\","/"))
> H:2023

These examples actually produce an "H" with a symbol after it, a 
different symbol for each.  Probably the message posting system can't 
display it, but I see it in a python terminal session on Windows.  So 
the first a="H:\2023" example produces "Hx", where x is some symbol. 
Since there is no backslash, no character gets replaced.  IOW,

a="H:\2023"; print(a)
and
a="H:\2023"; print(a.replace("\\","/"))
print the same thing.

>>>> a="H:\_2023"; print(a.replace("\\","/"))
> H:/_2023

What did you expect or want to happen?