# Python | Decimal ln() method

Decimal#ln() : ln() is a Decimal class method which returns the natural (base e) logarithm of the Decimal value.

Syntax: Decimal.ln()

Parameter: Decimal values

Return: the natural (base e) logarithm of the Decimal value.

Code #1 : Example for ln() method

 `# 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()) `

Output :

```Decimal value a :  0.9932
Decimal value b :  0.142857

Decimal a with ln() method :  -0.006823225348125508334064182053
Decimal b with ln() method :  -1.945911149055813305438686327

```

Code #2 : Example for ln() method

 `# 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()) `

Output :

```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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