Type conversion (int, float, string) in Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of mixed type conversions

What is the output of this Python code?

Python

a = '123'
b = 4.56
c = int(float(a)) + int(b)
print(c)

A TypeError

B 127.56

C 127

D 124

💡 Hint

Remember int() converts float to integer by dropping decimals.

The string '123' is converted to float 123.0, then to int 123. The float 4.56 is converted to int 4 by dropping decimals. Sum is 123 + 4 = 127.

❓ Predict Output

intermediate

String to int conversion with invalid input

What error does this code raise?

Python

x = '12.3'
y = int(x)
print(y)

A ValueError

B TypeError

C SyntaxError

D No error, prints 12

💡 Hint

int() cannot convert strings with decimal points directly.

Trying to convert '12.3' directly to int causes ValueError because it's not a valid integer string.

❓ Predict Output

advanced

Output of chained conversions and operations

What is the output of this code?

Python

val = 7.89
result = str(int(val)) + str(round(val))
print(result)

A "7.89"

B "78"

C "77"

D "79"

💡 Hint

int(val) drops decimals, round(val) rounds normally.

int(7.89) is 7, round(7.89) is 8, concatenated as strings gives '78'.

❓ Predict Output

advanced

Result of converting boolean to int and string

What is the output of this code?

Python

flag = True
num = int(flag)
text = str(flag)
print(num, text)

A 0 False

B True 1

C TypeError

D 1 True

💡 Hint

Boolean True converts to 1 as int, and 'True' as string.

int(True) is 1, str(True) is 'True'. So print outputs: 1 True

🧠 Conceptual

expert

Understanding type conversion behavior

Which option correctly describes the output of this code snippet?

Python

data = ['1', '2.5', '3']
converted = [int(float(x)) for x in data]
print(converted)

A [1, 2, 3]

B [1, 2.5, 3]

C [1, 3, 3]

D ValueError

💡 Hint

float(x) converts string to float, int() drops decimals.

Each string is converted to float then to int, so '2.5' becomes 2, resulting list is [1, 2, 3].