简单的数学运算符

Created: November-22, 2018

数值类型及其元类

numbers 模块包含数值类型的抽象元类：

子类	numbers.Number	numbers.Integral	numbers.Rational	numbers.Real	numbers.Complex
布尔	✓	✓	✓	✓	✓
INT	✓	✓	✓	✓	✓
fractions.Fraction	✓	-	✓	✓	✓
浮动	✓	-	-	✓	✓
复杂	✓	-	-	-	✓
decimal.Decimal	✓	-	-	-	-