Python | Decimal ln()方法
Decimal#ln() : ln() 是 Decimal 类方法，返回 Decimal 值的自然对数(以 e 为底)。
语法: Decimal.ln()
参数:十进制值
返回:十进制值的自然对数(以 e 为底)。
代码# 1:ln()方法示例
# Python Program explaining
# ln() method
# loading decimal library
from decimal import *
# Initializing a decimal value
a = Decimal('.9932')
b = Decimal('0.142857')
# printing Decimal values
print ("Decimal value a : ", a)
print ("Decimal value b : ", b)
# Using Decimal.ln() method
print ("\n\nDecimal a with ln() method : ", a.ln())
print ("Decimal b with ln() method : ", b.ln())
输出:
Decimal value a : 0.9932
Decimal value b : 0.142857
Decimal a with ln() method : -0.006823225348125508334064182053
Decimal b with ln() method : -1.945911149055813305438686327
代码# 2:ln()方法示例
# Python Program explaining
# ln() 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.ln() method
print ("\n\nDecimal a with ln() method : ", a.ln())
print ("Decimal b with ln() method : ", b.ln())
输出:
Decimal value a : 3.14
Decimal value b : 3.21E+7
Decimal a with ln() method : 1.144222799920161998805694448
Decimal b with ln() method : 17.28436658810024428478960133
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