Imports

Import Entire module

• Importing in python is process of loading code from a python module into the current script
• This allows you to use the functions and variables defined in the module in your current script also any additional modules that the imported module might depend upon
• For example to import the math module

  import math
  
  result=math.sqrt(9)
  print(result) # output : 3.0
  

Import specific function

form math import sqrt

result=math.sqrt(9)
print(result) # output : 3.0

for multiple functions use comma

form math import sqrt,pi

import using as keywork

import math as m

result=m.sqrt(9)
print(result) # output : 3.0

Use Modules or class from multiple file

person.py

class Person:
    Name=""
    Age=""

    def PrintData(self):
        print(f"Name:{self.Name}")
        print(f"Age:{self.Age}")

mainfile

from Person import Person

p= Person()
p.Name="Vivek"
p.Age=31
p.PrintData();

Import Modules from sub folder

sub folder file : Util/Calculator.py

class Calculator:
    def sum(number1,number2):
        return number1+number2

main file

from Util.Calculator import Calculator
a=10
b=20
print(Calculator.sum(a,b))

Use Specific version of package

ref : Force python to use older version of package

import pkg_resources
pkg_resources.require("Twisted==8.2.0")
import twisted

or

__requires__= 'twisted==8.2.0'
import pkg_resources
pkg_resources.require("twisted==8.2.0")
import twisted