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CBSE Class 11 Computer Science Question 83 of 91

String Manipulation — Question 7

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Question

Question 7

Write a Python program as per specifications given below:

  • Repeatedly prompt for a sentence (string) or for 'q' to quit.
  • Upon input of a sentence s, print the string produced from s by converting each lower case letter to upper case and each upper case letter to lower case.
  • All other characters are left unchanged.

For example,
Please enter a sentence, or 'q' to quit : This is the Bomb!
tHIS IS THE bOMB!
Please enter a sentence, or 'q ' to quit : What's up Doc ???
wHAT'S UP dOC ???
Please enter a sentence, or 'q' to quit : q

Solution
while True :
    str = input("Please enter a sentence, or 'q' to quit : ")
    newStr = ""
    if str.lower() == "q" :
        break
    for ch in str :
        if ch.islower() :
            newStr += ch.upper()
        elif ch.isupper() :
            newStr += ch.lower()
        else :
            newStr += ch
    print(newStr)
Output
Please enter a sentence, or 'q' to quit : This is the Bomb!
tHIS IS THE bOMB!
Please enter a sentence, or 'q' to quit : What's up Doc ???
wHAT'S UP dOC ???
Please enter a sentence, or 'q' to quit : q
Answer