The find() method returns the index of first occurrence of the substring (if found). If not found, it returns -1.
Example
message = 'Python is a fun programming language' # check the index of 'fun' print(message.find('fun')) # Output: 12 find() Syntax
The syntax of the find() method is:
str.find(sub[, start[, end]] )
find() Parameters
The find() method takes maximum of three parameters:
- sub - It is the substring to be searched in the str string.
- start and end (optional) - The range
str[start:end]within which substring is searched.
find() Return Value
The find() method returns an integer value:
- If the substring exists inside the string, it returns the index of the first occurence of the substring.
- If a substring doesn't exist inside the string, it returns -1.
Working of find() method
Example 1: find() With No start and end Argument
quote = 'Let it be, let it be, let it be' # first occurance of 'let it'(case sensitive) result = quote.find('let it') print("Substring 'let it':", result) # find returns -1 if substring not found result = quote.find('small') print("Substring 'small ':", result) # How to use find() if (quote.find('be,') != -1): print("Contains substring 'be,'") else: print("Doesn't contain substring") Output
Substring 'let it': 11 Substring 'small ': -1 Contains substring 'be,'
Example 2: find() With start and end Arguments
quote = 'Do small things with great love' # Substring is searched in 'hings with great love' print(quote.find('small things', 10)) # Substring is searched in ' small things with great love' print(quote.find('small things', 2)) # Substring is searched in 'hings with great lov' print(quote.find('o small ', 10, -1)) # Substring is searched in 'll things with' print(quote.find('things ', 6, 20)) Output
-1 3 -1 9
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