How To Check If Certain Characters In A Word Python

Cheque if String Contains Substring in Python

Checking if a string contains a substring is ane of the most mutual tasks in whatever programming language. Python offers many ways to check if a string contains a substring. The simplest and fastest way to check whether a string contains a substring or non in Python is using the "in" operator , which is used every bit a comparison operator . Another Python methods such as find(), index(), count() etc. also assist to Check if a cord contains a substring.

Using Python's "in" operator

The simplest and fastest way to check whether a string contains a substring or not in Python is the "in" operator . This operator returns true if the string contains the characters, otherwise, it returns simulated .

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Python "in" operator takes two arguments, i on the left and one on the right, and returns True if the left argument string is contained within the right statement cord.

More than on "in" operator

Note: The "in" operator is instance sensitive i.e, it volition treat the Uppercase characters and Lowercase characters differently.

__contains__() function

Python String grade has the __contains__() method that we can use to check if it contains another string or not. When nosotros utilize Python "in" operator , internally it calls __contains__() function. The __contains__ method defines how instances of class acquit when they appear at right side of in and not in operator. We tin can use this role directly besides, but don't . Methods that showtime with underscores are considered semantically private , still it's recommended to use in operator for readability purposes.

Using Python's str.find() method

Another method you can use is the cord.observe() method . The find() method evaluate if the string contains a substring . If it does, the find() method returns the starting index of a substring within the string otherwise it returns -1 .

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More than on notice() method

Using str.discover() method is the less Pythonic style , but it's nonetheless accepted. It's longer and a little bit more than disruptive, just it still gets the job done.

Using Python Regular Expression

Regular expression is widely used for pattern matching . Python has a built-in package called re , which can be used to piece of work with Regular Expressions . The re module contains a office chosen search() , it can be used to check if a string contains the specified search design .

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Using str.count() method

If you want to count the number of occurrences of a specific substring in a string, then you tin can use Python count() method . If the substring is not found in a string, the function returns 0 .

Source: http://net-informations.com/python/basics/contains.htm

Posted by: greinerairsed.blogspot.com

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