# Setting Precision in Python Using Decimal Module

• Last Updated : 01 Oct, 2020

The decimal module in Python can be used to set the precise value of a number. The default value of the Decimal module is up to 28 significant figures. However, it can be changed using getcontext().prec method.

The below program demonstrates the use of decimal module by computing the square root of 2 numbers up to the default the number of places.

## Python3

 `# Import required modules``import` `decimal  `` ` `# Create decimal object``ob1 ``=` `decimal.Decimal(``5``).sqrt()  ``ob2 ``=` `decimal.Decimal(``7``).sqrt()`` ` `# Display value  ``print``(ob1)``print``(ob2)`

Output

```2.236067977499789696409173669
2.645751311064590590501615754

```

We can set the precision up to n significant figure. The decimal.getcontext().prec has to be declared in the global scope such that all the decimal objects can have n significant figures.

## Python3

 `# Import required module``import` `decimal`` ` `# Set precision to a fixed value ``decimal.getcontext().prec ``=` `6`  ` ` `# Create Decimal object``ob1 ``=` `decimal.Decimal(``5``).sqrt()  ``ob2 ``=` `decimal.Decimal(``7``).sqrt()`` ` `# Display value up to 6 significant figures``print``(ob1)``print``(ob2)`

Output

```2.23607
2.64575

```
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