Naming rules and conventions in Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of variable naming with underscores

What is the output of this code snippet?

Python

my_var = 10
_myVar = 20
print(my_var + _myVar)

A 30

B 1020

C NameError

D SyntaxError

💡 Hint

Remember that variables starting with underscore are valid names.

Both variables are valid and hold integer values. Adding them results in 30.

❓ Predict Output

intermediate

Output with invalid variable name

What error does this code raise?

Python

2nd_var = 5
print(2nd_var)

A SyntaxError

B NameError

C TypeError

D 5

💡 Hint

Variable names cannot start with a number.

Variable names cannot begin with digits, so this causes a SyntaxError.

❓ Predict Output

advanced

Output of variable naming with reserved keywords

What error does this code produce?

Python

class = 10
print(class)

A TypeError

B SyntaxError

C 10

D NameError

💡 Hint

Reserved keywords cannot be used as variable names.

Using 'class' as a variable name is invalid and causes a SyntaxError.

❓ Predict Output

advanced

Output of variable naming with case sensitivity

What is the output of this code?

Python

Var = 5
var = 10
print(Var + var)

A 5

B 10

C 15

D NameError

💡 Hint

Python variable names are case sensitive.

Var and var are two different variables holding 5 and 10 respectively. Their sum is 15.

🧠 Conceptual

expert

Identify the valid variable names

Which of the following variable names are valid in Python? Select the one that is NOT valid.

A _myVar1

B myVar_2

C var3

D my-var

💡 Hint

Variable names cannot contain hyphens.

Variable names cannot have hyphens (-). Option D is invalid because of the hyphen.