Module search path in Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of sys.path modification

What will be the output of this code snippet?

Python

import sys
sys.path.append('/my/custom/path')
print('/my/custom/path' in sys.path)

A True

B False

C SyntaxError

D KeyError

💡 Hint

Appending a path to sys.path adds it to the list of module search paths.

Appending '/my/custom/path' to sys.path adds it to the list. Checking membership returns True.

❓ Predict Output

intermediate

Effect of sys.path.insert on module search order

What will be printed by this code?

Python

import sys
sys.path.insert(0, '/first/path')
print(sys.path[0])

A /first/path

B /my/custom/path

C IndexError

D TypeError

💡 Hint

Inserting at index 0 places the path at the start of sys.path.

sys.path.insert(0, ...) adds the path at the beginning, so sys.path[0] is '/first/path'.

❓ Predict Output

advanced

Output of sys.path after removing an element

What will be the output of this code?

Python

import sys
original_len = len(sys.path)
removed = sys.path.pop(0)
print(len(sys.path) == original_len - 1 and removed != '')

A TypeError

B False

C True

D IndexError

💡 Hint

Popping index 0 removes the first element and reduces length by one.

pop(0) removes the first element, so length decreases by 1 and removed is a non-empty string.

🧠 Conceptual

advanced

Understanding sys.path and module import

If a module named 'mymodule' exists in both '/path1' and '/path2', and sys.path is ['/path2', '/path1'], which module will Python import when you run import mymodule?

A Both modules will be imported

B The module from '/path1'

C ImportError will be raised

D The module from '/path2'

💡 Hint

Python searches sys.path in order and imports the first matching module.

Python imports the first found module in sys.path order, so '/path2' module is imported.

❓ Predict Output

expert

Result of modifying sys.path during import

What will be the output of this code?

Python

import sys
sys.path = ['/new/path'] + sys.path
print(sys.path[0])

A IndexError

B /new/path

C TypeError

D '/usr/lib/python3.12'

💡 Hint

Prepending a new path to sys.path changes the first element.

The new list has '/new/path' as first element, so sys.path[0] is '/new/path'.