import

import functions, classes , objects ,variables from a module. Lets try to import few mathematical functions for math module

General import Syntax

import module1, module2,... moduleN

Import all functions from math module

Lets import all function from math module

>>> import math
>>> math.pow(2,3)
8.0
>>> math.exp(1)
2.718281828459045

>>> from math import *  
>>> pow(2,3)            
8.0                     
>>> exp(1)              
2.718281828459045       
>>> ceil(2.6)           
3                       
>>>                     

Import specific function from module

Lets try to import only pow function from math module

>>> from math import pow               
>>> pow(2,3)                           
8.0                                    
>>> exp(1)                             
Traceback (most recent call last):     
  File "<stdin>", line 1, in <module>  
NameError: name 'exp' is not defined   
>>>                                    

In the above example exp is not imported thats the reason we received an error

Import more than one function from a module

Lets try to import pow,exp from math module

>>> from math import pow,exp
>>> pow(2,3)
8.0
>>> exp(1)
2.718281828459045
>>> ceil(2.3)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'ceil' is not defined

Note: Though we have ceil function in math module but we are unable to use it because we didn't import it

Import more than one module

Lets import math and sys Modules

>>> import math,sys   
>>> math.pow(2,3)     
8.0                   
>>> sys.argv          
['']                  
>>>                   

Note: argv is attribute from sys module

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