Python: Check whether lowercase letters exist in a string

Last update on December 21 2024 07:22:10 (UTC/GMT +8 hours)

Lowercase Letters Checker

Write a Python program to check whether lowercase letters exist in a string.

Pictorial Presentation:

Sample Solution-1:

Python Code:

# Assign the string 'A8238i823acdeOUEI' to the variable 'str1'.
str1 = 'A8238i823acdeOUEI'

# Check if there is any lowercase character in the string 'str1'.
# The 'any' function returns True if at least one character is lowercase.
print(any(c.islower() for c in str1))

Sample Output:

True 

Sample Solution-2:

Python Code:

# Define a function 'lower_case_str' that takes a text as input.
def lower_case_str(text):
    # Initialize a counter variable 'ctr' to keep track of lowercase characters.
    ctr = 0

    # Iterate through each character in the 'text'.
    for char in text:
        # Check if the character's Unicode value falls within the lowercase letters range.
        if (ord(char) >= 97 and ord(char) <= 122):
            ctr = ctr + 1

    # If 'ctr' is greater than 0, it means at least one lowercase character was found.
    if (ctr > 0):
        return True

# Define a string 'str1' with mixed characters.
str1 = 'A8238i823acdeOUEI'
print("Original string:", str1)

# Call the 'lower_case_str' function to check if lowercase letters exist in 'str1'.
print("Lowercase letters exist in the said string: ", lower_case_str(str1))

# Repeat the above steps for different strings.
str1 = 'PYTHON'
print("\nOriginal string:", str1)
print("Lowercase letters exist in the said string: ", lower_case_str(str1))

str1 = 'javascript'
print("\nOriginal string:", str1)
print("Lowercase letters exist in the said string: ", lower_case_str(str1))

Sample Output:

Original string: A8238i823acdeOUEI
Lowercase letters exist in the said string:  True

Original string: PYTHON
Lowercase letters exist in the said string:  None

Original string: javascript
Lowercase letters exist in the said string:  True

Flowchart:

Check if all input alphabets are small:

Python Code:

# Define a function 'lower_case_str' that takes a text as input.
def lower_case_str(text):
    # Check if the entire text is in lowercase using 'islower()' method.
    if text.islower():
        return True
    return False

# Print a message to indicate the purpose of the code.
print("Check if all input alphabets are small!")

# Define a string 'str1' with mixed characters.
str1 = 'A8238i823acdeOUEI'
print("\nOriginal string:", str1)

# Call the 'lower_case_str' function to check if all characters in 'str1' are lowercase.
print("Lowercase letters exist in the said string: ", lower_case_str(str1))

# Repeat the above steps for different strings.
str1 = 'PYTHON'
print("\nOriginal string:", str1)
print("Lowercase letters exist in the said string: ", lower_case_str(str1))

str1 = 'javascript'
print("\nOriginal string:", str1)
print("Lowercase letters exist in the said string: ", lower_case_str(str1))

Sample Output:

Check if all input alphabets are small!

Original string: A8238i823acdeOUEI
Lowercase letters exist in the said string:  False

Original string: PYTHON
Lowercase letters exist in the said string:  False

Original string: javascript
Lowercase letters exist in the said string:  True

Flowchart:

Python Code Editor:

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