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

Python Basic - 1: Exercise-122 with Solution

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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