python中ln怎么写

Decimal＃ln()：ln()是一个Decimal类方法，它返回Decimal值的自然(对数e)对数。

用法：Decimal.ln()

参数：十进制值

返回：十进制值的自然(以e为底)对数。

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()方法的示例

# 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