Decimal＃compare()：compare()是一个Decimal类方法，它比较两个Decimal值。
用法：Decimal.compare()
参数：十进制值
返回：
1 –如果a> b
-1 –如果
0 –如果a = b
代码1：compare()方法示例
# Python Program explaining
# compare() 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.compare() method
print ("\n\nDecimal a with compare() method : ", a.compare(a))
print ("Decimal a with compare() method : ", a.compare(b))
print ("Decimal b with compare() method : ", b.compare(a))输出：
Decimal value a : -1 Decimal value b : 0.142857 Decimal a with compare() method : 0 Decimal a with compare() method : -1 Decimal b with compare() method : 1
代码2：compare()方法的示例
# Python Program explaining
# compare() 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.compare() method
print ("\n\nDecimal a with compare() method : ", a.compare(a))
print ("Decimal a with compare() method : ", a.compare(b))
print ("Decimal b with compare() method : ", b.compare(a))输出：
Decimal value a : -3.14 Decimal value b : 3.21E+7 Decimal a with compare() method : 0 Decimal a with compare() method : -1 Decimal b with compare() method : 1
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