Environment variables usage in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the module needed to access environment variables.

Python

import [1]

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

Asys

Bconfig

Cenv

Dos

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'sys' instead of 'os' because it also deals with system info.

Trying to import a non-existent module like 'env' or 'config'.

The os module is used in Python to access environment variables.

2fill in blank

medium

Complete the code to get the value of the environment variable named 'HOME'.

Python

home_dir = os.[1]('HOME')

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Agetenvvalue

Bgetenvs

Cgetenv

Dgetenv_var

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect function names like 'getenvs' or 'getenv_var'.

Trying to access environment variables as dictionary keys without importing os.

The os.getenv() function returns the value of an environment variable.

3fill in blank

hard

Fix the error in the code to set an environment variable 'API_KEY' to '12345'.

Python

os.[1]['API_KEY'] = '12345'

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Aenviron

Bsetenv

Cputenv

Dset

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'setenv' which is a function but not used like this in Python.

Trying to call 'putenv' as a dictionary.

Using 'set' which is not a valid method here.

To set an environment variable, assign it in os.environ like a dictionary.

4fill in blank

hard

Fill both blanks to create a dictionary of environment variables whose names start with 'APP_'.

Python

app_vars = {key: os.environ[key] for key in os.environ if key [1] 'APP_'}

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Astartswith

Bendswith

Ccontains

Dequals

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'endswith' which checks the end of the string.

Using 'contains' which is not a string method.

Using 'equals' which checks full equality.

The startswith method checks if a string begins with a given substring.

5fill in blank

hard

Fill all three blanks to safely get an environment variable 'PORT' as an integer with default 8080.

Python

port = int(os.getenv('[1]', [2])) if os.getenv('[3]') else 8080

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APORT

B'8080'

D'80'

Attempts:

3 left

💡 Hint

Common Mistakes

Using integer 8080 directly as default in getenv, which expects a string.

Using different variable names inconsistently.

Not checking if the environment variable exists before converting.

This code tries to get 'PORT' from environment variables. If it exists, it converts it to an integer. If not, it uses 8080 as default.