Day 3 - Python

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Built-in Data Types :

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In programming, data type is an important concept.

Variables can store data of different types, and different types can do different things.

Text Type: str

Numeric Types: int, float, complex

Sequence Types: list, tuple, range

Mapping Type: dict

Set Types: set, frozenset

Boolean Type: bool

Binary Types: bytes, bytearray, memoryview

None Type: NoneType

for example

no1 = 5

print(no1)

print(type(no1))



no2 = ("get a value from user")

print(no2)

print(type(no2))



no3 = 5.5

print(no3)

print(type(no3))

result



5

<class 'int'>

get a value from user

<class 'str'>

5.5

<class 'float'>



Variables :

Variable is a reserved memory location to store values.

for example :

address = " 3, Kosakulam, madurai"

(reference variable

or

identifiers)

= ----> is called Assignment operator

Rules for Python variables:

1. A variable name must start with a letter or the underscore character


2. A variable name cannot start with a number


3. A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )


4. Variable names are case-sensitive (age, Age and AGE are three different variables)


5. Do not use any of Python's reserved keywords (e.g., for, if, while, etc.) as variable names.

( 1.Name should be meaningful.

bike_no = 1234

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 )

return

The return statement is used to exit a function and send a value back to the caller.

for example

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)



def divide(no1,no2):

    print(no1/no2)





result1 = add(100,50)

result2 = subtract(50,25)

multiply(result1,result2)

result

150

25

3750

pass :

The pass statement is used as a placeholder for future code.

example

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)



def divide(no1,no2):

    pass





result1 = add(100,50)

result2 = subtract(50,25)

multiply(result1,result2)

divide(result1,result2)

result

150

25

3750