Python Syntax and Data Types

After a long time, I’m back again! In this article, I will explain Python Syntax and Data Types.

Before starting, I want to mention where we can code? I will code on Python Jupyter Notebook.

OK, let’s start!

Python Syntax

Running Python Commands :

• Python commands can be run by typing directly on the Command-Line.

While many people learn python, they start with the first word Hello World”.

print("Hello World")
Output:
Hello World

• Or by creating a python file with .py extension on the server and running this file in Command-Line.

C: \Users\Your-Name>python myfile.py

Python Indents :

Python uses indentation to indicate a block of code.

For example,

print isn't under if the operator
if 5 > 2:
    print("Five is greater than two!")
Output:
Five is greater than two!

If we do that, then it gives an error.

if 5 > 2:
print("Five is greater than two!")
Output:
  Input In [4]
    print("Five is greater than two!")
    ^
IndentationError: expected an indented block

Comments

Python has the ability to add comments within the code. Comments start with “#”.

#This is comment
print("Hello")
Output:
Hello

We can also three quotes.

'''
Hi everyone
My name's Python!
'''
Output:
"\nHi everyone\nMy name's Python!\n\n"

Docstrings

It has an extended document capacity called Python document array. Docstrings can be one-line or multi-line. Python uses triple quotes at the beginning and end of the docstring.

Docstrings can also be used to write comments.

"""This is a multiline docstring."""
print("Hello, World!")
Output:
Hello, World!

Variables

The fields we create to temporarily store data in our Python programs are called variables. We can use single quotes or double quotes when making a verbal assignment (string) to variables. We should not use quotes when assigning a numeric assignment to variables. Otherwise, we will define a string variable.

variable_name = variable_value

name = "Celine"
age = 25
salary = 18000.50
print(name)
print(age)
print(salary)
Output:
Celine
25
18000.5

Changing the value of Variables

I want to explain as a give a simple example.

For example,

#This variable is integer
variable = 30
print(variable)
Output:
30

We want to see this variable of type,

• with type command

variable = 30
print(variable)
Output:
30
type(variable)
Output:
int

Now, we want to change to type. For example, string.

variable = "30"
print(variable)
type(variable)
Output:
30
str

Now, I want to explain data types. There are four types. These are,

• Int (Integer)
• Float
• String
• Boolean

Int:

I want to example for integer,

age = 40
type(age)
Output:
int

Float:

The float or decimal data type refers to positive or negative numbers that contain one or more decimals after the period.

I want to example float,

height = 1.80 #cm
type(height)
Output:
float

String:

Any string of characters is called a string in Python. It can be composed of a single letter, it can contain spaces, and it can contain special characters or numbers. In Python, the string data type is expressed with “str”.

game_name = "Sims 4"
type(game_name)
Output:
str

Boolean:

The Python Boolean type is one of Python’s built-in data types. It’s used to represent the true value of an expression. For example, the expression 1 <= 2 is True , while the expression 0 == 1 is False . Understanding how Python Boolean values behave is important to programming well in Python.

For example,

a = 2
b = 5
a < b
Output:
True
type(a < b)
Output:
bool
a = 8
b = 20
a == b
Output:
False
type(a == b)
Output:
bool

Multiple assignments in Python

Instead of assignment of variables one by one, we can do multiple assignments.

Let’s back to the above example that I give the variable.

name = "Celine"
age = 25
salary = 18000.50
print(name)
print(age)
print(salary)
Output:
Celine
25
18000.5

How we can multiple assignments in this example?

It’s simple :)

name, age, salary = "Celine", 25, 18000.50
print(name)
print(age)
print(salary)
Output:
Celine
25
18000.5

Another example is,

We can write to value one by one.

number1 = 80
number2 = 90
number3 = 50
print(number1)
print(number2)
print(number3)
Output:
80
90
50

But if we want to do multiple assignments, then

number1, number2, number3  = 80, 90, 50 
print(number1)
print(number2)
print(number3)
Output:
80
90
50

I hope while you’re reading my article you can enjoy it!

See you on another topic :)