Python|十进制 quantize() 方法

Decimal#quantize() : quantize()是一个 Decimal 类方法，它返回一个等于第一个十进制值（四舍五入）的值，该值具有第二个十进制值的指数。

Syntax: Decimal.quantize()

Parameter: Decimal values

Return: a value equal to first decimal value (rounded) having the exponent of second decimal value.

代码 #1：quantize() 方法的示例

# Python Program explaining 
# quantize() method
  
# loading decimal library
from decimal import *
  
  
# Initializing a decimal value
a = Decimal(-1)
  
b = Decimal('0.142857')
  
# printing Decimal values
print ("Decimal value a : ", a)
print ("Decimal value b : ", b)
  
  
# Using Decimal.quantize() method
print ("\n\nDecimal a with quantize() method : ", a.quantize(b))
  
print ("Decimal b with quantize() method : ", b.quantize(b))

输出 ：

Decimal value a :  -1
Decimal value b :  0.142857


Decimal a with quantize() method :  -1.000000
Decimal b with quantize() method :  0.142857

代码 #2：quantize() 方法的示例

# Python Program explaining 
# quantize() method
  
# loading decimal library
from decimal import *
  
  
# Initializing a decimal value
a = Decimal('-3.14')
  
b = Decimal('321e + 5')
  
  
# printing Decimal values
print ("Decimal value a : ", a)
print ("Decimal value b : ", b)
  
  
# Using Decimal.quantize() method
print ("\n\nDecimal a with quantize() method : ", a.quantize(b))
  
print ("Decimal b with quantize() method : ", b.quantize(b))

输出 ：

Decimal value a :  -3.14
Decimal value b :  3.21E+7


Decimal a with quantize() method :  -0E+5
Decimal b with quantize() method :  3.21E+7