Python Tutorial- Find Function

Python Exercise Lists

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