Python Full Course

Getting Started with Python

Python is a widely used high-level programming language for general-purpose programming, created by Guido van Rossum and first released in 1991. Python features a dynamic type system and automatic memory management and supports multiple programming paradigms, including object-oriented programming, imperative, functional, and procedural styles. It has a large and comprehensive standard library.

You can download and install python from here.

Hello, World in Python using IDLE

IDLE is a simple editor for python that comes bundled with python.

Open IDLE on your system, it will open a shell with options along at the top.

  • In the shell, there is a prompt of three right angle brackets:
  • Now write the following code in the prompt:

print(“Hello, World”)

  • Hit Enter

Creating variables and assigning values

<variable name> = <value>

Python uses = to assign value to variables, There is no need to declare a variable in advance, or to assign a data type of it. Assigning a value to a variable itself declares and initializes the variable with that value. There is no way to declare a variable without assigning it an initial value.

# Integer
a = 2
print(a)
# Output: 2

# Floating Point
pi = 3.14
print(pi)
# Output: 3.14

# String
name = "Aman Kharwal"
print(name)
# Output: Aman Kharwal
# Boolean
a = True
print(a)
# Output: True

Variable assignment works from left to right. So, the following code will give you error.

0 = x
print(x)
SyntaxError: can't assign to literal

Datatypes

Numbers:

Int: Integer
a = 2
b = 25
c = 100

Float: Floating Point
a = 2.0
b = 500.e0
c = 1245687979.e1 
Complex:
a = 2 + 10j
b = 100 + 100j 
Strings
a = "Aman"
b = "Kharwal"
c = "Aman Kharwal"
Sequences and Collections:
Tuple: An ordered collection of n values of any type (n >= 0).
a = (1, 2, 3)
b = ('a', 1, (1,2))


List: An ordered collection of n values (n >=0)
a = [1, 2, 3]
b = ['a', 1, [1, 2, 3], [3, 2, 'd']]

Set: An unordered collection of unique values. Items must be hashable.
a = {1, 2, 'a'}


Dict: An unordered collection of unique key-value pairs, keys must be hashable.
a = {1 : 'one', 2 : 'two'}
b = {'a' : 'apple', 'b' : 'book'}

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Aman Kharwal
Aman Kharwal

I'm a writer and data scientist on a mission to educate others about the incredible power of data📈.

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