Full stack python developer - day 3

Data type:

Data type identifies the type of data that a variable can store.

1.String(str):

a="hello world"

a='hello world'

2.Number(int):

a=10

3.Float(float):

a=12.2

4.Boolean(bool):

a=True

b=False

Some other data types:

list, set, complex, tuple, range, dict, set, frozenset, bytes,bytearray, memoryview, nonetype.

Reference variable:

To create a variable in python is to assign it a value using assignment operator.

Syntax:

variablename=value

Example:

number=12

Rules to write variablename:

1.Name should be meaningful.

number,word

2.Space is not allowed.

bike_no,bikeNo

3.Number are allowed but not in first place.

age1

4.No special character is allowed except _ and $ symbol.

car_no1

pass:

pass statement is null operation that does nothing when executed.The pass statement is used for future code.

type():

It is a build in function that is used to return the type of data stored in the variables of the program.

return:

The return is keyword is to exit a function and return a value.

Example 1:

num1 = 10

print(num1)

print("Datatype of num1 is",type(num1))



num2 = 26.5

print(num2)

print("Datatype of num2 is",type(num2))



num3 = 2 + 6j

print(num3)

print('Datatype of num3 is',type(num3))

Result:

10

Datatype of num1 is <class 'int'>

26.5

Datatype of num2 is <class 'float'>

(2+6j)

Datatype of num3 is <class 'complex'>

Example 2:

def add(no1, no2):

    print(no1+no2)

    return no1+no2



def subtract(no1,no2):

    print(no1-no2)

    return no1-no2



def multiply(no1,no2):

    print(no1*no2)

    return no1*no2



def divide(no1,no2):

    print(no1/no2)



def modules(no1,no2):

    pass



result1=add(10,12)

result2=subtract(12,8)

result3=multiply(result1,result2)

result4=divide(result3,10)



print(type(subtract(100,50)))

print(type(divide(10,20)))

print(type(modules(10,20)))

Result:

22

4

88

8.8

50

<class 'int'>

0.5

<class 'NoneType'>

<class 'NoneType'>