Import statement behavior in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the math module.

Python

import [1]

Drag options to blanks, or click blank then click option'

Aos

Bmath

Csys

Drandom

Attempts:

3 left

💡 Hint

Common Mistakes

Importing the wrong module name.

Forgetting to write the module name after import.

The import statement is used to bring in a module. Here, math is the module we want.

2fill in blank

medium

Complete the code to import only the sqrt function from the math module.

Python

from math import [1]

Drag options to blanks, or click blank then click option'

Acos

Bpi

Csin

Dsqrt

Attempts:

3 left

💡 Hint

Common Mistakes

Importing the whole module instead of just the function.

Choosing a function other than sqrt.

The from ... import ... syntax imports a specific function or variable. Here, sqrt is the square root function.

3fill in blank

hard

Fix the error in the import statement to use an alias for the math module.

Python

import math as [1]

Drag options to blanks, or click blank then click option'

Am

Bmth

Cmaths

Dmat

Attempts:

3 left

💡 Hint

Common Mistakes

Using a long or confusing alias.

Using the original module name as alias.

Using as allows us to give a short name to the module. m is a common short alias for math.

4fill in blank

hard

Fill both blanks to import the randint function from random module with an alias.

Python

from random import [1] as [2]

Drag options to blanks, or click blank then click option'

Arandint

Brandom

Crint

Drand

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong function name.

Using an alias that is not a valid identifier.

We import randint and give it the short name rand to use easily.

5fill in blank

hard

Fill all three blanks to import the choice and shuffle functions from random module with aliases.

Python

from random import [1] as [2], [3] as shuffle

Drag options to blanks, or click blank then click option'

Achoice

Bpick

Csample

Dselect

Attempts:

3 left

💡 Hint

Common Mistakes

Using function names that do not exist in random module.

Using aliases that are not valid Python names.

We import choice as pick and sample as shuffle. This shows how to rename multiple imports.

Practice

1. What happens when you use import module_name in Python?

easy

A. The module is copied into your current file.

B. Only the functions you call from the module are loaded.

C. The module code runs every time you call a function from it.

D. The entire module is loaded and its code runs once.

Solution

1. Step 1: Understand import behavior

   When you import a module, Python loads the whole module and runs its code once.

2. Step 2: Recognize module reuse

   After the first import, Python reuses the loaded module without running its code again.

3. Final Answer:

   The entire module is loaded and its code runs once. -> Option D

4. Quick Check:

   Import runs module once = A [OK]

Hint: Import runs module code once, then reuses it [OK]

Common Mistakes:

• Thinking module code runs every time a function is called
• Believing only used functions are loaded
• Assuming module code is copied into current file

2. Which of the following is the correct syntax to import only the sqrt function from the math module?

easy

A. from math import sqrt

B. import math.sqrt

C. import sqrt from math

D. from sqrt import math

Solution

1. Step 1: Recall import syntax for specific functions

   To import a specific function, use from module import function.

2. Step 2: Match syntax to options

   from math import sqrt matches this syntax: from math import sqrt.

3. Final Answer:

   from math import sqrt -> Option A

4. Quick Check:

   Specific import uses 'from module import item' = A [OK]

Hint: Use 'from module import name' to import parts [OK]

Common Mistakes:

• Using dot notation in import statement incorrectly
• Swapping module and function names
• Using 'import' with 'from' in wrong order

3. Consider two files:

# file1.py print('Loading file1') value = 10
# file2.py import file1 import file1 print(file1.value)

What is the output when running file2.py?

medium

A. Loading file1
Loading file1
10

B. Loading file1
10

C. 10
10

D. Error: module imported twice

Solution

1. Step 1: Understand module import behavior

   Python runs the module code only once, even if imported multiple times.

2. Step 2: Trace the output

   On first import, 'Loading file1' prints. Second import does nothing. Then prints value 10.

3. Final Answer:

   Loading file1 10 -> Option B

4. Quick Check:

   Module code runs once, reused later = B [OK]

Hint: Module code runs once, even if imported multiple times [OK]

Common Mistakes:

• Expecting module code to run twice
• Thinking repeated imports cause errors
• Confusing print output order

4. What is wrong with this code?

import math from math import sqrt print(math.sqrt(16))

medium

A. You cannot import the same module twice.

B. The code will cause a NameError.

C. There is no error; the code runs and prints 4.0.

D. You must use only one import style per module.

Solution

1. Step 1: Check import statements

   Importing the same module twice with different styles is allowed and does not cause error.

2. Step 2: Verify function call

   Calling math.sqrt(16) works and returns 4.0.

3. Final Answer:

   There is no error; the code runs and prints 4.0. -> Option C

4. Quick Check:

   Multiple imports allowed; function call works = D [OK]

Hint: Multiple imports of same module are allowed [OK]

Common Mistakes:

• Thinking multiple imports cause errors
• Confusing import styles must be exclusive
• Expecting NameError from this code

5. You have a module config.py with a variable setting = 5. In your main program, you do:

import config config.setting = 10 import config print(config.setting)

What will be printed and why?

hard

A. 10, because the module is loaded once and changes persist.

B. Error, because you cannot assign to module variables.

C. 5, because the second import reloads the module resetting variables.

D. None, because the variable is not accessible after import.

Solution

1. Step 1: Understand module import caching

   Python loads a module once and caches it; subsequent imports reuse the same module object.

2. Step 2: Analyze variable assignment and import

   Changing config.setting to 10 modifies the cached module. The second import does not reload, so the change remains.

3. Final Answer:

   10, because the module is loaded once and changes persist. -> Option A

4. Quick Check:

   Module cached; changes persist = C [OK]

Hint: Module imports cache; variable changes stay across imports [OK]

Common Mistakes:

• Assuming second import reloads module
• Thinking module variables are immutable
• Believing variable becomes inaccessible