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# Python | Decimal compare_signal() method

Decimal#compare_signal() : compare_signal() is a Decimal class method which compares th two Decimal values, except for the NaN values.

Syntax: Decimal.compare_signal()
Parameter: Decimal values
Return:
1 – if a > b
-1 – if a < b
0 – if a = b

Code #1 : Example for compare_signal() method

## Python3

 `# Python Program explaining``# compare_signal() method` `# loading decimal library``from` `decimal ``import` `*`  `# Initializing a decimal value``a ``=` `Decimal(``'0.142857'``)` `b ``=` `Decimal(``-``1``)`  `# printing Decimal values``print` `(``"Decimal value a : "``, a)``print` `(``"Decimal value b : "``, b)`  `# Using Decimal.compare_signal() method``print` `(``"\n\nDecimal a with compare_signal() method : "``, a.compare_signal(a))` `print` `(``"Decimal a with compare_signal() method : "``, a.compare_signal(b))` `print` `(``"Decimal b with compare_signal() method : "``, b.compare_signal(a))`

Output :

```Decimal value a :  0.142857
Decimal value b :  -1

Decimal a with compare_signal() method :  0
Decimal a with compare_signal() method :  1
Decimal b with compare_signal() method :  -1```

Code #2 : Example for compare_signal() method

## Python3

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

Output :

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

Decimal a with compare_signal() method :  0
Decimal a with compare_signal() method :  -1
Decimal b with compare_signal() method :  1```

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