Python String find() Method
The find() function returns the index number of the first occurrence of a substring in the specified string (case sensitive). If the substring is not found, it returns -1.
How to formulate it like this:
string. find(substring, start, end)Parameters:
substring : (required) A substring that must be searched for in the given string.
start ( optional ) : ( Optional ) The starting position where the sub-string within the string needs to be checked.
End ( ) : ( Optional ) The index of the end within the string that the search ends with. The default is the end of the string
Return value: The find() function returns an integer of the index number of the first occurrence of a substring in the specified string. If the substring is not found, it returns -1.
We will use the find() function without the optional ( start ) and ( end ) parameters. We'll just use the substring parameter to find the index number of the first occurrence of a substring in the given string.
In the following example, we will search for the index number of the first occurrence of the substring represented by the word (With ),
Example:
#undefined The string to be searched
string = "learn python With ahmed obaid"
# Searches the given string for the index number of the first occurrence of the substring and returns an integer
print(string. find ("With"))The output will be:
13In the following example, we will use the find() function with optional (start) and (end) parameters.
Example:
# The string to be searched
string = "learn python With ahmed obaid"
# Searches the given string for the index number of the first occurrence of the substring and returns an integer
# Noting that we started the search from index #2
# Substring not found, it returns -1.
print(string. find ("le", 2))
# Searches the given string for the index number of the first occurrence of the substring and returns an integer
# Noting that we started the search process from index number 0 to the end index number 10
print(string. find ("py", 0, 10))
# Searches the given string for the index number of the first occurrence of the substring and returns an integer
# Noting that we started the search process from index number 2 to the end index number 30
print(string. find ("ahmed", 10, undefined 30))The output will be:
-1
6
18External sources:
Built-in functions - official Python documentation
If you have any questions or concerns, leave them in the comments
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Python python data types Python String string methods python String search functions in Python python string find method
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Ahmed Obaid
Hello, I am Ahmed Obaid, an Egyptian Arabic programmer. I would like to put my experiences learning Python on this site So that it will be a reference for you and me as well.
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