Common string transformations in Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of string strip and replace

What is the output of this Python code?

Python

text = "  Hello, World!  "
result = text.strip().replace(",", "")
print(result)

A " Hello World! "

B "Hello World!"

C "Hello, World!"

D "Hello,World!"

💡 Hint

strip() removes spaces at start and end; replace() removes commas.

strip() removes spaces at both ends, then replace removes commas inside the string.

❓ Predict Output

intermediate

Result of string split and join

What is the output of this code?

Python

sentence = "Python is fun"
words = sentence.split()
result = "-".join(words)
print(result)

A "Python-is-fun"

B "Python is fun"

C "Python-isfun"

D "Python-is-fun-"

💡 Hint

split() breaks string into words; join() connects them with dashes.

split() creates ['Python', 'is', 'fun'], join connects with '-' producing 'Python-is-fun'.

❓ Predict Output

advanced

Output of string formatting with f-string

What does this code print?

Python

name = "Alice"
age = 30
print(f"Name: {name.upper()}, Age: {age + 5}")

A "Name: ALICE, Age: 30"

B "Name: alice, Age: 35"

C "Name: Alice, Age: 30"

D "Name: ALICE, Age: 35"

💡 Hint

upper() makes name uppercase; age + 5 adds 5 to age.

name.upper() converts 'Alice' to 'ALICE'; age + 5 equals 35.

❓ Predict Output

advanced

Result of chained string methods

What is printed by this code?

Python

text = "  python Programming  "
result = text.strip().capitalize().replace("programming", "Coding")
print(result)

A "Python Programming"

B "Python coding"

C "Python Coding"

D "python Coding"

💡 Hint

strip() removes spaces, capitalize() makes first letter uppercase, replace() swaps words.

strip() removes spaces -> 'python Programming', capitalize() makes first letter uppercase and rest lowercase -> 'Python programming', replace swaps 'programming' with 'Coding'.

❓ Predict Output

expert

Output of complex string slicing and methods

What is the output of this code?

Python

s = "DataScience"
result = s[1:9:2].lower() + s[-3:].upper()
print(result)

A "aaceNCE"

B "atcienceCE"

C "atcEENCE"

D "AaceNCE"

💡 Hint

Slice with step 2 from index 1 to 9: indices 1('a'),3('a'),5('c'),7('e') -> 'aace'.lower(), then add last 3 uppercase.

s[1:9:2] is 'aace' (indices 1:a, 3:a, 5:c, 7:e), lower() makes 'aace', s[-3:] is 'nce', upper() makes 'NCE', combined 'aaceNCE'.