Import aliasing in Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of alias import usage

What is the output of this Python code using import aliasing?

Python

import math as m

result = m.sqrt(16)
print(result)

A NameError

B 16

C sqrt(16)

D 4.0

💡 Hint

Remember that aliasing lets you use a shorter name for a module.

The math module is imported as 'm'. Calling m.sqrt(16) returns the square root of 16, which is 4.0.

❓ Predict Output

intermediate

Effect of aliasing on function call

What will be printed by this code snippet?

Python

from datetime import datetime as dt

now = dt.now()
print(type(now))

A <class 'datetime.datetime'>

B <class 'datetime.date'>

C datetime.now()

D AttributeError

💡 Hint

Check what dt.now() returns and its type.

The alias 'dt' refers to datetime class. dt.now() returns a datetime object, so its type is .

🔧 Debug

advanced

Identify the error caused by incorrect aliasing

What error does this code raise?

Python

import json as jsn

print(json.dumps({'a':1}))

A AttributeError

B NameError

C SyntaxError

D TypeError

💡 Hint

Look at the name used to call the function vs the alias.

The module json is imported as jsn, but the code calls json.dumps, which is undefined, causing a NameError.

🧠 Conceptual

advanced

Understanding aliasing effect on namespace

After running this code, which names are defined in the current namespace?

Python

import os as operating_system
from math import sqrt as square_root

print(square_root(9))

A operating_system and square_root

B os and square_root

C os and sqrt

D operating_system and sqrt

💡 Hint

Aliasing changes the names you use in your code.

The module os is imported as operating_system, and sqrt is imported as square_root. So only these two names exist in the namespace.

📝 Syntax

expert

Which import aliasing syntax is correct?

Which option correctly imports the module 'collections' with alias 'col'?

A from collections as col import *

B from collections import * as col

C import collections as col

D import collections col

💡 Hint

The 'as' keyword is used after the module name in import statements.

The correct syntax for aliasing a module is 'import module_name as alias'. Other options are invalid syntax.

Practice

1. What does import aliasing in Python allow you to do?

easy

A. Run code without importing modules

B. Change the original module code

C. Automatically update modules

D. Use a different name for a module or function when importing it

Solution

1. Step 1: Understand import aliasing purpose

   Import aliasing lets you give a module or function a new name when you import it, usually shorter or clearer.

2. Step 2: Compare options

   Only Use a different name for a module or function when importing it describes using a different name for a module or function during import, which matches import aliasing.

3. Final Answer:

   Use a different name for a module or function when importing it -> Option D

4. Quick Check:

   Import aliasing = different import name [OK]

Hint: Alias means giving a new name when importing [OK]

Common Mistakes:

• Thinking aliasing changes module code
• Confusing aliasing with automatic updates
• Believing aliasing runs code without import

2. Which of the following is the correct syntax to import the math module with alias 'm'?

easy

A. import math as m

B. import math to m

C. from math import m

D. import m as math

Solution

1. Step 1: Recall correct import alias syntax

   The correct syntax to alias a module is: import module_name as alias_name.

2. Step 2: Match syntax with options

   import math as m matches this syntax exactly: import math as m.

3. Final Answer:

   import math as m -> Option A

4. Quick Check:

   import ... as ... = correct alias syntax [OK]

Hint: Use 'import module as alias' for aliasing [OK]

Common Mistakes:

• Using 'to' instead of 'as'
• Confusing import with from-import syntax
• Reversing alias and module names

3. What will be the output of this code?

import math as m
print(m.sqrt(16))

medium

A. 16

B. 4.0

C. sqrt(16)

D. Error: module not found

Solution

1. Step 1: Understand alias usage in code

   The math module is imported as 'm', so m.sqrt(16) calls the sqrt function from math.

2. Step 2: Calculate sqrt(16)

   The square root of 16 is 4.0, so print(m.sqrt(16)) outputs 4.0.

3. Final Answer:

   4.0 -> Option B

4. Quick Check:

   m.sqrt(16) = 4.0 [OK]

Hint: Alias calls work like original module calls [OK]

Common Mistakes:

• Expecting integer 4 instead of float 4.0
• Confusing alias name with original module name
• Thinking alias causes import error

4. What is wrong with this code?

import random as r
print(random.randint(1, 5))

medium

A. random is not defined due to aliasing

B. random module is not imported

C. randint function does not exist

D. Syntax error in import statement

Solution

1. Step 1: Analyze import aliasing effect

   The module random is imported as 'r', so the name 'random' is not defined in this code.

2. Step 2: Identify cause of error

   Calling random.randint(...) causes a NameError because 'random' is undefined; should use 'r.randint(...)'.

3. Final Answer:

   random is not defined due to aliasing -> Option A

4. Quick Check:

   Aliased module name must be used [OK]

Hint: Use alias name, not original module name [OK]

Common Mistakes:

• Using original module name after aliasing
• Assuming alias imports both names
• Thinking randint is missing

5. You want to import the datetime module as 'dt' and use only the datetime class inside it with alias 'dtime'. Which is the correct way?

hard

A. import datetime as dt
from dt import datetime as dtime

B. from dt import datetime as dtime
import datetime as dt

C. import datetime as dt
from datetime import datetime as dtime

D. from datetime import datetime as dt
import datetime as dtime

Solution

1. Step 1: Import module with alias

   Use 'import datetime as dt' to alias the module as dt.

2. Step 2: Import class with alias from aliased module

   You cannot import from the alias 'dt' directly; you must import from the original module name 'datetime'. So use 'from datetime import datetime as dtime'.

3. Step 3: Check option correctness

   import datetime as dt from datetime import datetime as dtime correctly imports the module as dt and the datetime class as dtime from the original module.

4. Final Answer:

   import datetime as dt from datetime import datetime as dtime -> Option C

5. Quick Check:

   Module alias then from original module import class with alias [OK]

Hint: Alias module first, then import class from original module [OK]

Common Mistakes:

• Trying to import from original after aliasing
• Importing from alias before aliasing
• Swapping alias names