I want to insert some text before a substring in a string.
For example:
str = "thisissometextthatiwrote"
substr = "text"
inserttxt = "XX"
I want:
str = "thisissomeXXtextthatiwrote"
Assuming substr can only appear once in str, how can I achieve this result? Is there some simple way to do this?
my_str = "thisissometextthatiwrote"
substr = "text"
inserttxt = "XX"
idx = my_str.index(substr)
my_str = my_str[:idx] + inserttxt + my_str[idx:]
ps: avoid using reserved words (i.e. str in your case) as variable names
Why not use replace?
my_str = "thisissometextthatiwrote"
substr = "text"
inserttxt = "XX"
my_str.replace(substr, substr + inserttxt)
# 'thisissometextXXthatiwrote'
new_str = my_str.replace(substr, substr + inserttxt)
text with textXXUse str.split(substr) to split str to ['thisissome', 'thatiwrote'], since you want to insert some text before a substring, so we join them with "XXtext" ((inserttxt+substr)).
so the final solution should be:
>>>(inserttxt+substr).join(str.split(substr))
'thisissomeXXtextthatiwrote'
if you want to append some text after a substring, just replace with:
>>>(substr+appendtxt).join(str.split(substr))
'thisissometextXXthatiwrote'
With respect to the question (were ´my_str´ is the variable), the right is:
(inserttxt+substr).join(**my_str**.split(substr))
