Decimal＃is_nan()：is_nan()是Decimal类方法，它检查Decimal值是否为NaN值。
用法：Decimal.is_nan()
参数：十进制值
返回：true –如果小数值为NaN值；否则为假
代码1：is_nan()方法示例
# Python Program explaining
# is_nan() method
# loading decimal library
from decimal import *
# Initializing a decimal value
a = Decimal(-1)
b = Decimal('nan')
# printing Decimal values
print ("Decimal value a : ", a)
print ("Decimal value b : ", b)
# Using Decimal.is_nan() method
print ("\n\nDecimal a with is_nan() method : ", a.is_nan())
print ("Decimal b with is_nan() method : ", b.is_nan())输出：
Decimal value a : -1 Decimal value b : NaN Decimal a with is_nan() method : False Decimal b with is_nan() method : True
代码2：is_nan()方法的示例
# Python Program explaining
# is_nan() 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.is_nan() method
print ("\n\nDecimal a with is_nan() method : ", a.is_nan())
print ("Decimal b with is_nan() method : ", b.is_nan())输出：
Decimal value a : -3.14 Decimal value b : 3.21E+7 Decimal a with is_nan() method : False Decimal b with is_nan() method : False
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