Python: Check if a given string contains only lowercase or uppercase characters

Last update on December 21 2024 07:18:56 (UTC/GMT +8 hours)

Check Lower or Uppercase

Write a Python program to check if a given string contains only lowercase or uppercase characters.

Sample Solution-1:

Python Code:

# Define a function 'test' that checks if a string is entirely lowercase or uppercase.
def test(input_str):
    # Use the 'islower()' and 'isupper()' methods to check if the string is entirely lowercase or uppercase.
    return input_str.islower() or input_str.isupper()

# Test the 'test' function with different input strings.
str1 = "PHP"
print("Original string: ", str1)
print("Coded string: ", test(str1))

str2 = "javascript"
print("\nOriginal string: ", str2)
print("Coded string: ", test(str2))

str3 = "JavaScript"
print("\nOriginal string: ", str3)
print("Coded string: ", test(str3))

Sample Output:

Original string:  PHP
Coded string:  True

Original string:  javascript
Coded string:  True

Original string:  JavaScript
Coded string:  False

Explanation:

Here is a breakdown of the above Python code:

Test Function (test function):

The "test()" function is defined to check if a given string is entirely in lowercase or uppercase.
It uses the islower() and isupper() methods, which return 'True' if all characters in the string are lowercase or uppercase, respectively.

Flowchart:

Sample Solution-2:

Python Code:

# Define a function 'test' that checks if a string is entirely uppercase or lowercase.
def test(input_str):
    # Check if the string is entirely in uppercase or lowercase.
    return (input_str.upper() == input_str) or (input_str.lower() == input_str)

# Test the 'test' function with different input strings.
str1 = "PHP"
print("Original string: ", str1)
print("Coded string: ", test(str1))

str2 = "javascript"
print("\nOriginal string: ", str2)
print("Coded string: ", test(str2))

str3 = "JavaScript"
print("\nOriginal string: ", str3)
print("Coded string: ", test(str3))

Sample Output:

Original string:  PHP
Coded string:  True

Original string:  javascript
Coded string:  True

Original string:  JavaScript
Coded string:  False

Explanation:

Here is a breakdown of the above Python code:

Test Function (test function):

The "test()" function is defined to check if a given string is entirely in uppercase or lowercase.
It uses the upper() and lower() methods to create uppercase and lowercase versions of the string, respectively.
The function returns 'True' if the original string is equal to either its uppercase or lowercase version.

Flowchart:

Python Code Editor:

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