Libraries

What are Libraries/Modules?

A library is a collection of functions and methods that allows you to perform many actions without writing your code.
Python has a large standard library, commonly referred to as the Python Standard Library.
There are also many third-party libraries available that can be installed using package managers like pip.

Understanding Open Source

The code is freely available to copy, modify, and distribute.
The code is usually maintained by a community of developers.
Pandas source code

Installing Packages

Use pip to install packages.
pip install pandas
Do this from the command line or terminal.
if you have anaconda installed, you can use conda install pandas

Installing Packages, Google Colab

In Google Colab, you can install packages using !pip install pandas
Most of the popular packages are already installed in Google Colab.

Importing Packages

Use the import statement to import a package.
import pandas
The import is how we access the functions and classes in the package.

Example

# my_module.py
def my_function():
    print("Hello from my function")

def my_other_function():
    print("Hello from my other function")

# main.py
import my_module

my_module.my_function() 
# outputs "Hello from my function"

Using From to directly import specific functions

# my_module.py
def my_function():
    print("Hello from my function")

def my_other_function():
    print("Hello from my other function")

import using from

# main.py
from my_module import my_other_function

my_other_function()
# outputs "Hello from my other function"

Importing Packages, Aliasing

You can alias the package name to make it easier to use.
import pandas as pd

import pandas as pd

data = pd.DataFrame()