# How to Round Off Decimals in Python? – Multiple Methods

In Python, there are several ways to round off decimals to a specified number of digits. In this article, we will go through several methods to round off decimals using Python.

## Method 1: Using the round() function

The built-in `round()` function can be used to round off decimals to a specified number of digits. The syntax of the `round()` function is as follows:

```round(number, ndigits)
```

where `number` is the decimal number to be rounded and `ndigits` is the number of digits to round off to. Here’s an example:

```# Round off to 2 decimal places
x = 3.14159
result = round(x, 2)
print(result)
```

The output of the above code will be:

```3.14
```

In the above example, we used the `round()` function to round off the decimal number `x` to 2 decimal places.

## Method 2: Using the format() method

Another way to round off decimals in Python is by using the `format()` method. The `format()` method can be used to format a string by replacing placeholders with values. The syntax of the `format()` method is as follows:

```'{:.nf}'.format(number)
```

where `n` is the number of digits to round off to and `number` is the decimal number to be rounded. Here’s an example:

```# Round off to 2 decimal places
x = 3.14159
result = '{:.2f}'.format(x)
print(result)
```

The output of the above code will be:

```3.14
```

In the above example, we used the `format()` method to round off the decimal number `x` to 2 decimal places.

## Method 3: Using the Decimal module

The `Decimal` module provides a way to perform decimal arithmetic in Python. It also provides a way to round off decimals to a specified number of digits. The syntax of the `Decimal` module is as follows:

```from decimal import Decimal

# Round off to 2 decimal places
x = Decimal('3.14159')
result = round(x, 2)
print(result)
```

The output of the above code will be:

```3.14
```

In the above example, we used the `Decimal` module to round off the decimal number `x` to 2 decimal places.

## Method 4: Using the math module

The `math` module provides a way to perform mathematical operations in Python. It also provides a way to round off decimals to a specified number of digits. The syntax of the `math` module is as follows:

```import math

# Round off to 2 decimal places
x = 3.14159
result = math.floor(x * 100) / 100
print(result)
```

The output of the above code will be:

```3.14
```

In the above example, we used the `math` module to round off the decimal number `x` to 2 decimal places.

## Method 5: Using the numpy module

The `numpy` module is a powerful library for scientific computing in Python. It also provides a way to round off decimals to a specified number of digits. The syntax of the `numpy` module is as follows:

```import numpy as np

# Round off to 2 decimal places
x = 3.14159
result = np.round(x, 2)
print(result)
```

The output of the above code will be:

```3.14
```

In the above example, we used the `numpy` module to round off the decimal number `x` to 2 decimal places.

## Method 6: Using the truncate() method

The `truncate()` method can be used to truncate the decimal part of a number. We can then add the rounded decimal part to the integer part of the number to round off the decimal to a specified number of digits. The syntax of the `truncate()` method is as follows:

```import math

# Round off to 2 decimal places
x = 3.14159
integer_part = math.trunc(x)
decimal_part = round((x - integer_part) * 100)
result = float(integer_part) + float(decimal_part) / 100
print(result)
```

The output of the above code will be:

```3.14
```

In the above example, we used the `truncate()` method to truncate the decimal part of the number `x`. We then added the rounded decimal part to the integer part of the number to round off the decimal to 2 decimal places.

## Conclusion

In this article, we went through several methods to round off decimals in Python. We used the built-in `round()` function, the `format()` method, the `Decimal` module, the `math` module, the `numpy` module, and the `truncate()` method to round off decimals to a specified number of digits. We also provided examples for each method, along with a detailed explanation.