Python|十进制 copy_sign() 方法

Decimal#copy_sign() : copy_sign()是一个 Decimal 类方法，它返回第一个 Decimal 值的副本，其符号设置为与第二个 Decimal 值的符号相同。

Syntax: 
Decimal.copy_sign()

Parameter: 
Decimal values

Return: 
the copy of the first Decimal value with the sign set
to be the same as the sign of the second Decimal value.

代码 #1：copy_sign() 方法的示例

# Python Program explaining 
# copy_sign() 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.copy_sign() method
print ("\n\nDecimal a with copy_sign() method : ", a.copy_sign(a))
  
print ("Decimal a with copy_sign() method : ", a.copy_sign(b))
  
print ("Decimal b with copy_sign() method : ", b.copy_sign(a))

输出 ：

Decimal value a :  -1
Decimal value b :  0.142857


Decimal a with copy_sign() method :  -1
Decimal a with copy_sign() method :  1
Decimal b with copy_sign() method :  -0.142857

代码 #2：copy_sign() 方法的示例

# Python Program explaining 
# copy_sign() 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.copy_sign() method
print ("\n\nDecimal a with copy_sign() method : ", a.copy_sign(a))
  
print ("Decimal a with copy_sign() method : ", a.copy_sign(b))
  
print ("Decimal b with copy_sign() method : ", b.copy_sign(a))

输出 ：

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


Decimal a with copy_sign() method :  -3.14
Decimal a with copy_sign() method :  3.14
Decimal b with copy_sign() method :  -3.21E+7