Dynamic typing in Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this dynamic typing example?

Consider the following Python code that uses dynamic typing. What will be printed?

Python

x = 5
x = 'hello'
print(x)

A TypeError

B 5

C NameError

D hello

💡 Hint

Remember, Python variables can change type at any time.

The variable x first holds an integer 5, then it is reassigned to a string 'hello'. The print statement outputs the current value, which is 'hello'.

❓ Predict Output

intermediate

What is the output when changing variable types?

What will this code print?

Python

a = 10
b = a
b = 'changed'
print(a)

A TypeError

B changed

C 10

D None

💡 Hint

Changing b does not affect a because integers are immutable.

Variable a remains 10 because b was assigned the value of a, not a reference that changes a.

❓ Predict Output

advanced

What error does this code raise?

What error will this code produce?

Python

x = 5
x = x + '10'
print(x)

A ValueError

B TypeError

C SyntaxError

D 5

💡 Hint

You cannot add an integer and a string directly.

Adding an integer and a string causes a TypeError in Python because they are incompatible types for addition.

❓ Predict Output

advanced

What is the output of this variable reassignment?

What will be printed by this code?

Python

var = [1, 2, 3]
var = 'now a string'
print(type(var))

A <class 'str'>

B <class 'list'>

C <class 'int'>

D TypeError

💡 Hint

The variable var is reassigned to a string.

The type of var after reassignment is str, so printing type(var) outputs .

🧠 Conceptual

expert

Which option best explains dynamic typing in Python?

Choose the statement that correctly describes dynamic typing in Python.

A Variables do not have types; only values have types, and variables can be reassigned to values of any type.

B Variables are statically typed and checked at compile time.

C Python requires explicit type declarations for all variables.

D Variables have fixed types and cannot change after assignment.

💡 Hint

Think about whether variables themselves have types or if types belong to values.

In Python, variables are just names that point to values. Values have types, and variables can be reassigned to values of any type at any time.