Python os.path.expandvars() Method

Python os.path.expandvars() method is used to expand environment variables embedded within a path string. It takes a string containing environment variables in the format $name or ${name} and replaces them with their corresponding values as defined in the environment.

If an environment variable in the path is not set or malformed, it is left unchanged in the returned string.

This method is handy for situations where paths are influenced by the environment, providing flexibility and adaptability for various operating systems and user environments.

Syntax

os.path.expandvars(path)

Parameters

Name Description
path (string, required) It is a path string potentially containing environment variables.

Return value

It returns a new string with expanded environment variables.

Example 1: Expanding a simple environment variable

Visual Representation of Python os.path.expandvars() Method

import os

# Assuming an environment variable HOME is set
path = '$HOME/example.txt'
expanded_path = os.path.expandvars(path)

print(f"Expanded path: {expanded_path}")

Output

Expanded path: /Users/krunallathiya/example.txt

In this example, if the HOME environment variable is set (common in Unix-like systems), it is replaced with its value in the path.

Example 2: Using braces for environment variables

Using braces for environment variables

import os

# Using braces for environment variables
path = "Temp Directories are in ${TMPDIR}"
expanded_path = os.path.expandvars(path)

print(f"Expanded path: {expanded_path}")

Output

Expanded path: Temp Directories are in /var/folders/8v/x42znv0n7r5383bnmngj4kmw0000gn/T/

Example 3: Expanding multiple environment variables

Visual Representation of Expanding multiple environment variables

import os

# Multiple environment variables
path = '$HOME/Documents/$USER/notes.txt'
expanded_path = os.path.expandvars(path)

print(f"Expanded path: {expanded_path}")

Output

Expanded path: /Users/krunallathiya/Documents/krunallathiya/notes.txt

In this case, $HOME and $USER are expanded to their respective values, assuming they are set in the environment.

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