Python core data type numeric types and collections

Related calculations

Operation	Description	Operation	Description
X + y	Addition	X * * y	Powers
X-y	Subtraction	X% y	modulo (x mod y)
X * y	Multiplication	+x	One-dollar addition
X/Y	Division (2.6 Omit the number of decimal parts)	-Y	One-dollar subtraction
X//Y	Truncate except	X if y else Z	Three-dimensional expression

Compare operations

Operation	Description	Operation	Description
X << y	X left shift y bit	X \	Y	Bitwise OR
X >> y	x right Shift y bit	x ^ y	Bitwise XOR OR
X & Y	Bitwise-AND	~x	Bitwise negation

Some notes about the numbers

Is_integer
Test whether a floating-point number is an integer official document

and value-dependent modules math ,random
Int () and Math.trunc () omit the fractional part, and the round () function can be rounded, with the math.floor holding the decimal place at 2.7 for 0, and the int effect at 3.0.

python3.0 no longer supports dictionary comparison sizes and can be replaced with sorted (Dict.items ())

Set Set

Add () Insert
Update () set by location
Remove () Deletes an item by value

Why use collections?

Filter out Duplicates
Record locations that have been visited