Python | Decimal from_float()方法
原文:https://www . geesforgeks . org/python-decimal-from _ float-method/
Decimal # from _ float():from _ float()是一个 Decimal 类方法，它将浮点数精确地转换为十进制数。
语法:十进制. from_float()
参数:十进制值
Return: 将浮点数准确地转换为十进制数。
代码# 1:from _ float()方法示例
# Python Program explaining
# from_float() 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.from_float() method
print ("\n\nDecimal a with from_float() method : ", a.from_float(0.1))
print ("Decimal b with from_float() method : ", b.from_float(float('nan')))
输出:
Decimal value a : -1
Decimal value b : 0.142857
Decimal a with from_float() method : 0.1000000000000000055511151231257827021181583404541015625
Decimal b with from_float() method : NaN
代码# 2:from _ float()方法示例
# Python Program explaining
# from_float() 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.from_float() method
print ("\n\nDecimal a with from_float() method : ", a.from_float(0.02))
print ("Decimal b with from_float() method : ", b.from_float(float('-inf')))
输出:
Decimal value a : -3.14
Decimal value b : 3.21E+7
Decimal a with from_float() method : 0.0200000000000000004163336342344337026588618755340576171875
Decimal b with from_float() method : -Infinity
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