How would you convert a string into lowercase?

Use the lower() method. It returns a new string with all letters in lowercase. The original string does not change, because strings in Python are immutable.

text = "Hello World"
print(text.lower())
print(text)

Output:

To change the case the other way, see how to convert a string into uppercase. A common use of lower() is to compare two strings without worrying about capital letters.

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