You can call a function from another Python file by creating a separate file with the function definition, importing it into your main file, and then calling it.

Method 1: Import All Functions from a File

1. Create a Python file (e.g., test.py) and define your function inside it.

2. In another file, import all functions using from test import *.

3. Call the desired function directly by its name.

Method 2: Import Specific Functions

1. Create a Python file (e.g., calc.py) with multiple function definitions.

2. In your main file, import only the required functions using from calc import addNumbers, multiplyNumbers.

3. Call the imported functions directly without prefixing the file name.

Method 3: Import Entire Module

1. Ensure both files are in the same directory.

2. In your main file, import the other file as a module using import filename (without .py).

3. Call the function using the syntax filename.functionName().

Method 4: Import from a Subdirectory