Python Programming Tutorial for Beginners - Step by Step

What can be developed using Python ?

Web and Internet Development.

Desktop GUI Applications.

Statistics and Data Analytics.

Software Development.

Database Access.

Network Programming.

Games and 3D Graphics.

Artificial Intelligence >> Machine Learning

Download Python from this link -

www.python.org/downloads/

Sample Code -

>>> print("String abc@123 ")

String abc@123

>>> "Hello World"

'Hello World'

>>> 45

45

>>> print(45)

45

>>> print('45')

45

>>> print("45")

45

>>> 45.67

45.67

>>> print(45 + 56)

101

>>> print("Hello", "How are you?", 56)

Hello How are you? 56

>>>

Sample Code for the Lecture -

>>> # Numbers , Words , Collections

>>> # Strings - Alphanumeric Characters - A-Z, a-z, 0-9 , !@#$%^&

>>> print("Hello@123!")

Hello@123!

>>> # type()

>>> type("Mohan")

<class 'str'>

>>> "hello"

'hello'

>>> # Numbers - Integers, Float, Complex

>>> type(1)

<class 'int'>

>>> type(-456)

<class 'int'>

>>> 45

45

>>> type(3464654363563563)

<class 'int'>

>>> 45.67

45.67

>>> type(45.67)

<class 'float'>

>>> type(-34.56)

<class 'float'>

>>> 1+5j

(1+5j)

>>> type(1+2j)

<class 'complex'>

>>> # Boolean - True and False

>>> type(True)

<class 'bool'>

>>> type(False)

<class 'bool'>

>>> # Collections

>>> # Lists , Tuples, Sets and Dict

>>> type([45, 67, 89])

<class 'list'>

>>> type((45, 67, 89))

<class 'tuple'>

>>> type({45, 67, 89})

<class 'set'>

>>> # Name and Email - String

>>> # Age - 25

>>> # Are you married - True False

>>> # Salary - 1456.78

>>> # [45,56,77,78,99]

Sample Code : 

Python 3.6.8 (tags/v3.6.8:3c6b436a57, Dec 24 2018, 00:16:47) [MSC v.1916 64 bit (AMD64)] on win32

Type "help", "copyright", "credits" or "license()" for more information.

>>> # Variables

>>> x = 5

>>> type(5)

<class 'int'>

>>> type(x)

<class 'int'>

>>> name = 'Mohan'

>>> print(name)

Mohan

\

>>> name = "Sohan"

>>> name

'Sohan'

>>> condition = True

>>> condition

True

>>> type(condition)

<class 'bool'>

>>> email = "abc@mail.com"

>>> email1 = "avc@gmail.com"

>>> 1email = "acv@mail.com"

SyntaxError: invalid syntax

>>> # You can not start a varible name with numbers

>>> first name = "Mohan"

SyntaxError: invalid syntax

>>> first@name = "Mohan"

SyntaxError: can't assign to operator

>>> first-name = "Mohan"

SyntaxError: can't assign to operator

>>> date_of_birth = "22July1980"

>>> print(date_of_birth)

22July1980

>>> x = 56

>>> y = 67

>>> x + y

123

>>> x = 78

>>> x + y

145

>>> del x

>>> x

Traceback (most recent call last):

  File "<pyshell#26>", line 1, in <module>

    x

NameError: name 'x' is not defined

>>> name = "Mohan Singh"

>>> len(name)

11

>>> name

'Mohan Singh'

>>> "My name is " + name

'My name is Mohan Singh'

>>>

Sample Code for the lesson

>>> # Assignment Operators

>>> x = 5

>>> name = "John"

>>> y = [45,6,7]

>>> a = 30

>>> b = a

>>> b

30

>>> u = 45

>>> u = v

Traceback (most recent call last):

  File "<pyshell#8>", line 1, in <module>

    u = v

NameError: name 'v' is not defined

>>> v = u

>>> v

45

>>> # ADD and Assign

>>> x+=56

>>> # x = x + 56

>>> print(x)

61

>>> a- = 5

SyntaxError: invalid syntax

>>> a -= 5

>>> a

25

>>> a *= 10 # a = a*10

>>> a

250

>>> a /= 5 # a = a / 5

>>> a

50.0

>>> type(a)

<class 'float'>

>>> a %= 4

>>> a

2.0

>>>

>>> # 50 / 4 - 4 * 12 = 48 | 2

>>> a = 50 % 4

>>> 2 ** 5

32

>>> a **= 5

>>> a

32

>>> # a = a ** 5

>>> a //= 3

>>> a

10

>>> # a = a // 3

>>>

Sample Code for the lesson

>>> # Equals to "=="

>>> x = 67

\

>>> y = 68

>>> x == y # is x equal to y

False

>>> x + 1 == y

True

>>> if (x + 1 == y):

print("Correct")

Correct

>>> x != y # is x not equal to y

True

>>> name = "John"

>>> name != "John"

False

>>> a = 56

>>> b = 56.1

>>> a > b

False

>>> b > a

True

>>> # Greater than and equal to

>>> a = 56.0

>>> b = 56

>>> a > b

False

>>> a == b

True

>>> 23 == "23"

False

>>> 23 == int("23")

True

>>> str(23) == "23"

True

>>> a >= b

True

>>> # Less than <

>>> a < b

False

>>> a <= b

True

>>>

Sample Code for the lesson

>>> x = 56

>>> y = 76

>>> z = 76 - 20

>>> x is y

False

>>> x is z

True

>>> x is not z

False

>>> x is not y

True

>>> # Membership Operators

>>> name = "Ramesh"

>>> "es" in name # is es in Ramesh

True

>>> "hi" in name

False

>>> ml = [45,46,67]

>>> 46 in ml

True

>>> 45 not in ml

False

>>> 50 in ml

False

>>> attendance = ["mohan", "sohan", "rohan", "sunil"]

>>> "geeta" in attendance

False

>>> if("geeta" not in attendance):

print("geeta was absent")

geeta was absent

>>> 0 & 1

0

>>> 0001 & 1000

SyntaxError: invalid token

>>> 1 & 1

1

>>> 1 & 0

0

>>>