Python Tutorial- Find Function

The find() method is used to retrieve whether the string contains the target string. If it does, it returns the index of the first occurrence of the string; otherwise, it returns -1.

The syntax of the find () method is as follows:

str.find(sub[,start[,end]])

The meaning of each parameter in this format is as follows:

• str: the original string;
• sub: the substring to be retrieved;
• start: indicates the starting position to start searching. If not specified, the search will start from the beginning by default;
• end: indicates the end position of the search. If not specified, it will be searched to the end by default.

[Example] Use the find() method to retrieve the first occurrence of "e" in the string of "www.freelearningpoints.com".

string = "www.freelearningpoints.com"
string.find('e')

The output is:

6

[Example] Manually specify the position of the starting index.

string = "www.freelearningpoints.com"
string.find('e', 8)

The output is:

9

[Example] Specify the positions of the start index and end index manually.

string = "www.freelearningpoints.com"
string.find('e', 2, -3)

The output is:

6

The string between indexes (2, -3) is "w.freelearningpoints. ", and since it does not contain ".", the return value of the find () method is -1.

Note that Python also provides the rfind () method. The biggest difference from the find () method is that rfind () searches from the right side of the string. Example:

string = "www.freelearningpoints.com"
string.rfind('e')

The output is:

9