Table of Contents
The string isupper() method returns whether or not all characters in a string are uppercased or not.
The syntax of isupper() method is:
string.isupper()
1. String isupper() Parameters
The isupper() method doesn’t take any parameters.
2. Return value from String isupper()
The isupper() method returns:
- True if all characters in a string are uppercase characters
- False if any characters in a string are lowercase characters
3. Example 1: Return value of isupper()
# example string string = "THIS IS GOOD!" print(string.isupper()); # numbers in place of alphabets string = "THIS IS ALSO G00D!" print(string.isupper()); # lowercase string string = "THIS IS not GOOD!" print(string.isupper());
Output
True True False
4. Example 2: How to use isupper() in a program?
string = 'THIS IS GOOD'
if string.isupper() == True:
print('Does not contain lowercase letter.')
else:
print('Contains lowercase letter.')
string = 'THIS IS gOOD'
if string.isupper() == True:
print('Does not contain lowercase letter.')
else:
print('Contains lowercase letter.')
Output
Does not contain lowercase letter. Contains lowercase letter.
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