[Python] How To Convert String Case

Using Python to process the case conversion of strings, or the comparison of upper and lower case strings is an extraordinarily easy task. First, Python is a simple and easy-to-write programming language. Second, these commonly used capitalization conversion methods have long been built into Python’s string processing.

Today, I will record the following different Python string case processing:

• Determine case
• Convert case

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Determine case

• islower(): Determine whether the string is all lowercase
• isupper(): Determine whether the string is all uppercase
• istitle(): Determine whether the string conforms to the title format (the first letter is capitalized)

a = "lower"
b = "UPPER"
c = "This Is A Title"

print(a.islower())
print(b.isupper())
print(c.istitle())

Output:

True
True
True

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Convert case

• lower(): Convert all characters in the string to lowercase letters
• upper(): Convert all characters in the string to uppercase letters
• capitalize(): Convert the first letter to uppercase and the others to lowercase
• title(): Convert the first letter of each word to uppercase, the others are lowercase

s = "there is a BIG news!"

print("lower():", s.lower())
print("upper():", s.upper())
print("capitalize():", s.capitalize())
print("title():", s.title())

Output:

lower(): there is a big news!
upper(): THERE IS A BIG NEWS!
capitalize(): There is a big news!
title(): There Is A Big News!

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References

• https://thehelloworldprogram.com/python/python-string-methods/
• https://www.geeksforgeeks.org/isupper-islower-lower-upper-python-applications/
• https://www.programiz.com/python-programming/methods/string/lower

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