str.find
Find the first occurrence of the substring sub in the string.
Python 3.13
str.find(sub[, start[, end]])Parameters
- substr
- The substring to find.
- startintoptional
- The index where the search starts.
- endintoptional
- The index before which the search stops.
Return value
The index of the first occurrence, or -1 if the substring is not found.
Examples
Position of the first match
Python 3.13
print('hello'.find('l'))2
Substring not found
Python 3.13
print('hello'.find('z'))-1
Details
To only check whether a substring is present, use the in operator: "ll" in "hello". If a missing substring is an error, str.index is more convenient.