python - Insert a string before a substring of a string -


i want insert text before substring in string.

for example:

str = "thisissometextthatiwrote" substr = "text" inserttxt = "xx"

i want:

str = "thisissomexxtextthatiwrote"

assuming substr can appear once in str, how can achieve result? there simple way 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 case) variable names


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