Python Exercise: Sequence of lines as input and prints the lines as output in lower case

Last update on April 17 2025 12:58:29 (UTC/GMT +8 hours)

12. Sequence of Lines to Lowercase

Write a Python program that accepts a sequence of lines (blank line to terminate) as input and prints the lines as output (all characters in lower case).

Pictorial Presentation:

Sample Solution:

Python Code:

# Create an empty list named 'lines'
lines = []

# Continue to prompt the user for input indefinitely until a blank line is entered
while True:
    # Prompt the user to input a line of text
    l = input()
    
    # Check if the entered line is not empty (non-empty string)
    if l:
        # Convert the entered line to uppercase and append it to the 'lines' list
        lines.append(l.upper())
    else:
        # If the entered line is empty, break out of the loop
        break;

# Iterate through each line in the 'lines' list
for l in lines:
    # Print each line (converted to uppercase) from the 'lines' list
    print(l) 
	

Sample Output:

w3resource                                                                                                    
Python                                                                                                        
                                                                                                              
W3RESOURCE                                                                                                    
PYTHON

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to continuously accept user input lines until a blank line is encountered, then output all lines in lower case.
• Write a Python program to read multiple lines from standard input and convert each line to lower case before printing.
• Write a Python program to build a list of input lines, convert them to lower case, and print the list.
• Write a Python program to implement a loop that terminates on an empty line and prints all captured lines in lower case.

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• Python Conditional Statements and loops Exercises Home ↩
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Python Code Editor:

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