Python - 056 : count(), find(), index() and rindex() functions in python
Python String count()
The count() method returns the number of occurrences of a substring in the given string.
message = 'python is popular programming language'
number of occurrence of 'p'
print('Number of occurrence of p:', message.count('p'))
Output: Number of occurrence of p: 4
Python String find() method
Python String find() method returns the lowest index or first occurrence of the substring if it is found in a given string. If it is not found, then it returns -1.
Syntax: str_obj.find(sub, start, end)
Parameters:
sub: Substring that needs to be searched in the given string.
start (optional): Starting position where the substring needs to be checked within the string.
end (optional): End position is the index of the last value for the specified range. It is excluded while checking.
Return: Returns the lowest index of the substring if it is found in a given string. If it’s not found then it returns -1.
5 Ways to Find the Index of a Substring in Python
str.find()
str.rfind()
str.index()
str.rindex()
re.search()
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