Python|十进制 is_qnan() 方法

Decimal#is_qnan() : is_qnan()是一个 Decimal 类方法，用于检查 Decimal 值是否为 NaN 值。

Syntax: Decimal.is_qnan()

Parameter: Decimal values

Return: true – if the Decimal value is quite NaN value; otherwise false

代码 #1：is_qnan() 方法的示例

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

输出 ：

Decimal value a :  -1
Decimal value b :  NaN


Decimal a with is_qnan() method :  False
Decimal b with is_qnan() method :  True

代码 #2：is_qnan() 方法的示例

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

输出 ：

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


Decimal a with is_qnan() method :  False
Decimal b with is_qnan() method :  False