• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

The Programming Expert

Solving All of Your Programming Headaches

  • HTML
  • JavaScript
  • jQuery
  • PHP
  • Python
  • SAS
  • VBA
  • About
You are here: Home / Python / How to Check if String Contains Uppercase Letters in Python

How to Check if String Contains Uppercase Letters in Python

February 11, 2022 Leave a Comment

In Python, we can check if a string contains uppercase characters by checking each letter to see if that letter is uppercase in a loop.

def checkStrContainsUpper(string):
    for x in string:
        if x == x.upper():
            return True
    return False

print(checkStrContainsUpper("all letters here are lowercase"))
print(checkStrContainsUpper("We Have some uppercase Letters in this One."))

#Output:
False
True

When processing strings in a program, it can be useful to know if we have uppercase or lowercase characters. Using Python, we can easily check if string contains uppercase characters with the help of the Python upper() function.

To check if a string contains uppercase, we just need to loop over all letters in the string until we find a letter that is equal to that letter after applying the upper() function.

Below is a Python function which will check if a string contains uppercase characters.

def checkStrContainsUpper(string):
    for x in string:
        if x == x.upper():
            return True
    return False

print(checkStrContainsUpper("all letters here are lowercase"))
print(checkStrContainsUpper("We Have some uppercase Letters in this One."))

#Output:
False
True

How to Check if String Contains Lowercase in Python

We can also check if a string contains lowercase characters in Python very easily.

To check if a string contains lowercase letters in Python, we can adjust our function that we defined above to use the Python lower() function, instead of the upper() function.

Below is a Python function which will check if a string contains lowercase characters.

def checkStrContainsLower(string):
    for x in string:
        if x == x.lower():
            return True
    return False

print(checkStrContainsLower("ALL THE LETTERS ARE UPPERCASE"))
print(checkStrContainsLower("We Have some uppercase Letters in this One."))

#Output:
False
True

Hopefully this article has been useful for you to learn how to check if a string contains uppercase characters in Python.

Other Articles You'll Also Like:

  • 1.  Python divmod() Function – Get Quotient and Remainder After Division
  • 2.  Repeat String with * Operator in Python
  • 3.  Using Python to Replace Multiple Spaces with One Space in String
  • 4.  Python Check if Object Has Attribute
  • 5.  Find Least Common Multiple of Numbers Using Python
  • 6.  Append Multiple Elements to List Using Python
  • 7.  Python max float – What’s the Maximum Float Value in Python?
  • 8.  Transpose DataFrame pandas – Using the pandas transpose Function
  • 9.  Python Replace Space with Underscore Using String replace() Function
  • 10.  Write Integer to File Using Python

About The Programming Expert

The Programming Expert is a compilation of a programmer’s findings in the world of software development, website creation, and automation of processes.

Programming allows us to create amazing applications which make our work more efficient, repeatable and accurate.

At the end of the day, we want to be able to just push a button and let the code do it’s magic.

You can read more about us on our about page.

Reader Interactions

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Primary Sidebar

About The Programming Expert

the programming expert main image

The Programming Expert is a compilation of hundreds of code snippets to help you find solutions to your problems in Python, JavaScript, PHP, HTML, SAS, and more.

Search

Learn Coding from Experts on Udemy

Looking to boost your skills and learn how to become a programming expert?

Check out the links below to view Udemy courses for learning to program in the following languages:

Copyright © 2022 · The Programming Expert · About · Privacy Policy