Python basis - Math

First, let's print hello world!

>>>print "Hello, World"
>>>print ("Hello, World")

Arithmetic

>>> 2+5
    7
    >>> 5-2
    3
    >>> 10/2
    5
    >>> 5*2
    10
    >>> 10/5+1
    3
    >>> 2*3-4
    2

    

In the above operation, four are related to the operation symbol: plus (+), subtract (-), multiply (*), divide (/)

>>> 2 + 2
4
>>> 50 - 5*6
20
>>> (50 - 5*6) / 4
5.0
>>> 8 / 5  # division always returns a floating point number
1.6

Divide (/) always returns a float type number. Do floor and get an integer division results (returns the integer portion of the quotient) // operator can be used; the remainder may be used to calculate%:

>>> 17 / 3  # classic division returns a float
5.666666666666667
>>>
>>> 17 // 3  # floor division discards the fractional part
5
>>> 17 % 3  # the % operator returns the remainder of the division
2
>>> 5 * 3 + 2  # result * divisor + remainder
17