String concatenation and repetition in Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of repeated string concatenation

What is the output of this Python code?

Python

s = 'ab'
result = s * 3 + 'cd'
print(result)

A "abcdabcdabcd"

B "ababab"

C "abababcd"

D "ababcdcdcd"

💡 Hint

Remember that multiplying a string repeats it, and + adds strings together.

The string 'ab' repeated 3 times is 'ababab'. Adding 'cd' at the end gives 'abababcd'.

❓ Predict Output

intermediate

Result of mixed string operations

What does this code print?

Python

a = 'x'
b = 'y'
print((a + b) * 2)

A "xyxy"

B "xxyy"

C "xy2"

D "x2y2"

💡 Hint

The parentheses affect the order of operations.

The expression (a + b) creates 'xy'. Multiplying by 2 repeats it twice: 'xyxy'.

❓ Predict Output

advanced

Output of string repetition with variables

What is the output of this code?

Python

word = 'go'
count = 4
print(word * count + word)

A "gogogogogog"

B "gogogogo"

C "gogogo4"

D "gogogogogo"

💡 Hint

Multiplying a string by a number repeats it that many times.

word * count repeats 'go' 4 times: 'gogogogo'. Adding 'go' once more results in 'gogogogogo'.

❓ Predict Output

advanced

String concatenation with different types

What happens when you run this code?

Python

s = 'num'
n = 3
print(s + n * 2)

A TypeError

B "numnum"

C "num6"

D "num3num3"

💡 Hint

You cannot add a string and an integer directly.

Trying to add a string and an integer causes a TypeError in Python.

🧠 Conceptual

expert

Understanding string repetition and concatenation order

Given the code below, what is the value of variable result?

Python

result = 'a' + 'b' * 2 + 'c' * 3

A "ab2c3"

B "abbccc"

C "aabcc"

D "abcabcabc"

💡 Hint

Multiplication repeats the string before concatenation.

The code repeats 'b' twice to get 'bb' and 'c' three times to get 'ccc'. Adding 'a' at the start results in 'abbccc'.