operator.txt

                              data type
None = when you have a variable and that variable is not assigned to any value thenit is None noramlly in other language we use keyword null
numeric
1.int
2.float
3.bool
4.complex=complex number is represent in python in form of a+bj where a and b are variable and j is imaginary number

we can convert from one type to other type using typecast . 

sequence
1.list
2.tuple
3.set
4.string
5.range
we dont have char in python

dictionary

>>> a=5.9
>>> b=int(a)
>>> b
5
>>> a=10+5j
>>> a=True
>>> b=a
>>> b
True
>>> b=int(a)
>>> b
1
>>> a=10
>>> b=12
>>> c=complex(a,b)
>>> c
(10+12j)

>>> 
>>> list(range(2,10,2))
[2, 4, 6, 8]
>>> 
>>> list(range(2,10,9))
[2]
>>> 
>>> 
range take three parameter start ,stop,diffrence