what are def and how to use it?

Question

also a little about class would also be appreciated.

Answer 1

"def" is used to define functions. Using this you can make your own functions with your own conditions.

For example:

def my_func():
print("Hello world!")

Now that I've defined a function above, I can execute it whenever I like:

print(my_func())

Output: Hello world!

Hope this helped!

Answer 2

def is a keyword to define functions
and class keyword is to define a class object

def function_name():
## code goes here

class ClassName(object):
## Code goes here