Modules
In Python, a module is a file containing Python definitions and statements. The file name is the module name with the suffix `.py` added. Modules allow you to organize Python code into reusable files, making it easier to manage and maintain your codebase. You can import modules in other Python scripts to use their functions, classes, and variables.
Here's how you can create and use modules in Python:
### Creating a Module:
Create a new Python file (for example, `mymodule.py`), and define some functions and variables in it:
```python
# mymodule.py
def greet(name):
return f"Hello, {name}!"
pi = 3.14159
```
### Importing a Module:
In another Python file, you can import the `mymodule` module and use its functions and variables:
```python
# main.py
import mymodule
name = "Alice"
message = mymodule.greet(name)
print(message)
print("Value of pi:", mymodule.pi)
```
When you run `main.py`, it imports the `mymodule` module and uses the `greet()` function and the `pi` variable from that module.
### Importing Specific Items from a Module:
You can also import specific functions or variables from a module:
```python
# main.py
from mymodule import greet
name = "Bob"
message = greet(name)
print(message)
```
In this example, only the `greet()` function is imported from the `mymodule` module.
### Renaming a Module during Import:
You can rename a module during import for easier use:
```python
# main.py
import mymodule as mm
name = "Eve"
message = mm.greet(name)
print(message)
```
Here, `mymodule` is imported as `mm`, so you can use `mm.greet()` instead of `mymodule.greet()`.
Python's module system allows you to create organized and reusable code components, making it easier to manage and scale your projects.
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