Python - custom string contains() method

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In this article, we would like to show you how to check if the string contains a substring in Python.

Quick solution:

text = "ABC"
print("BC" in text)  # True


Practical example

In this example, we use in operator to create a custom implementation of the string contains() method and check if text contains some words.

text = "dirask is cool"

word_1 = "cool"
word_2 = "abc"

def contains(string, phrase):
    return phrase in string

print(contains(text, word_1))  # True
print(contains(text, word_2))  # False




You can also use string.find() method to find index of the specified substring.

text = "dirask is cool"
print(text.find("is"))  # 7

Alternative titles

  1. Python - string contains substring (custom implementation)
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Python - custom string contains() method
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