alvas - 2 years ago 152
Python Question

# what does these operators mean (** , ^ , %, //) ? - Python?

Other than the standard

`+`
,
`-`
,
`*`
and
`/`
operators; but what does these mean (
`**`
,
`^`
,
`%`
,
`//`
) ?

``````>>> 9+float(2) # addition
11.0
>>> 9-float(2) # subtraction
7.0
>>> 9*float(2) # multiplication
18.0
>>> 9/float(2) # division
4.5
>>>
>>> 9**float(2) # This looks like a square, (i.e. power 2)
81.0
>>> 9**float(3) # So ** is equivalent to `math.pow(x,p)` ?
729.0
``````

`^`
operator?

``````>>> 9^int(2) # What is `^` in `x^u` , it only allows `int` for `u`
11
>>> 9^int(3)
10
>>> 9^int(4)
13
>>> 9^int(5)
12
>>> 9^int(6)
15
>>> 9^int(7)
14
>>> 9^int(8)
1
>>> 9^int(9)
0
>>> 9^int(10)
3
>>> 9^int(11)
2
>>> 9^int(12)
5
``````

`%`
in
`x%m`
returns a normal remainder modulus, but only if
`m < x`
, why is that so? What does
`%`
do?

``````>>> 9%float(2)
1.0
>>> 9%float(3)
0.0
>>> 9%float(4)
1.0
>>> 9%float(5)
4.0
>>> 9%float(6)
3.0
>>> 9%float(7)
2.0
>>> 9%float(8)
1.0
>>> 9%float(9)
0.0
>>> 9%float(10)
9.0
>>> 9%float(11)
9.0
>>> 9%float(12)
9.0
``````

`//`
operator? what does it do?

``````>>> 9//float(2)
4.0
>>> 9//float(3)
3.0
>>> 9//float(4)
2.0
>>> 9//float(5)
1.0
>>> 9//float(6)
1.0
>>> 9//float(7)
1.0
>>> 9//float(8)
1.0
>>> 9//float(9)
1.0
>>> 9//float(1)
9.0
>>> 9//float(0.5)
18.0
``````

• `**`: exponentiation
• `^`: exclusive-or (bitwise)
• `%`: modulus
• `//`: divide with integral result (discard remainder)