python in operator case insensitive

title: case-insensitive python 'in' operator tutorial
introduction:
the python 'in' operator is a powerful tool for checking the presence of a substring within a string. however, by default, it performs a case-sensitive search. in many scenarios, it's beneficial to perform case-insensitive searches. this tutorial will guide you through the process of using the 'in' operator in a case-insensitive manner with practical code examples.
output:
this example demonstrates a function case_insensitive_in() that converts both the target string and the substring to lowercase before using the 'in' operator. the comparison is now case-insensitive.
output:
conclusion:
chatgpt
...

#python #python #python #python #python
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