python core data types numeric types and collections

Related calculations

Operation	Description	Operation	Description
x + y	Addition	x ** y	Power
x - y	Subtraction	x % y	Modulo (x mod y)
x * y	Multiplication	+x	One-yuan addition
x / y	Division (2.6 omit the decimal part)	-y	Uniary subtraction
x // y	Truncation and division	x if y else z	Ternary expression

Comparison operation

#x x left shift y bitsx \ybitwise orx >> yx shifts right by y bitsx ^ yBitwise exclusive OR## x & y##Some notes on numbers

Operation	Description	Operation	Description
bitwise AND	~x	bitwise negation

is_integer

Test whether a floating point number is an integer official document

Numeric-related modules

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math

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randomint() and math.trunc() will omit the decimal part, the round() function can do rounding, math.floor is 2.7 The decimal place will be retained as 0 under 3.0, which has the same effect as int under 3.0
python3.0 no longer supports dictionary size comparison, you can use sorted(dict.items()) instead

Set

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add() insert

update() union by position

remove() delete an item based on value

Why use a set?

Filter out duplicates

Record visited locations

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