1、decimal: from decimal import * print(Decimal.from_float(12.222)) getcontext().prec=6 from decimal import * getcontext().prec = 6 Decimal(1)/Decimal(7) 2、quantize from decimal import * Decimal('50.5679').quantize(Decimal('0.00'))
3、转为str from decimal import * str(Decimal('3.40').quantize(Decimal('0.0'))) 4、fractions from fractions import Fraction
print(Fraction(3.5)) print(Fraction(5/6)) print(Fraction(5,6)) print(Fraction('5/6')) 5、fractions.Fraction.from_decimal(v) 6、random.randrange()
image.png math.fabs() 绝对值 math.copysign() 返回正确符号 math.pow(x,y) math.sqrt(9.0) math.log math.exp(2) e**2 math.degrees()