Python String upper() Usage and Example

Python String Methods

The string.upper() method converts all lowercase letters in the string to uppercase and returns it.

The syntax of the upper() method is:

string.upper()

string.upper() Parameters

The upper() method does not take any parameters.

upper() Return Value

The upper() method returns the uppercase string from the given string. It converts all lowercase letters to uppercase.

If there are no lowercase letters, return the original string.

Example1：Convert string to uppercase

# Example string
string = "this　should　be　uppercase!"
print(string.upper())
# String with numbers
# Convert all letters to uppercase
string = "Th!s　Sh0uLd　B3　uPp3rCas3!"
print(string.upper())

When running the program, the output is:

THIS　SHOULD　BE　UPPERCASE!
TH!S　SH0ULD　B3　UPP3RCAS3!

Example2：How to use upper() in the program?

# First string
firstString = "python　is　awesome!"
# Second string
secondString = "PyThOn　Is　AwEsOmE!"
if(firstString.upper() == secondString.upper()):
　　　　print("The strings are the same.")
else:
　　　　print("The strings are different.")

When running the program, the output is:

The strings are the same.

Note:If you want to convert to a lowercase string, please uselower()You can also useswapcase()Swap lowercase and uppercase letters.

Python String Methods