In this Python tutorial, we will learn how to format a floating number to a fixed width.

**Table Of Contents**

## Format a floating number to fixed width using % operator

The % operator can be used as a formatting operator. Such that it can be possible to return fixed width from a floating point number. We need to specify the width as an integer (number of decimals) to be returned.

**Syntax:**

'%.nf'%value

Where n specifies the width and value is the floating point number. It returns a fixed width float point number.

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**Example 1:**

Consider the floating number – 12.456734455 and return 6,8 and 2 decimals separately.

# Consider a float value with 9 decimals value = 12.456734455 # Get upto 6 decimals print ('value upto 6 decimals - %.6f' % value) # Get upto 8 decimals print ('value upto 8 decimals - %.8f' % value) # Get upto 2 decimals print ('value upto 2 decimals - %.2f' % value)

**Output:**

value upto 6 decimals - 12.456734 value upto 8 decimals - 12.45673445 value upto 2 decimals - 12.46

- We specified width as 6. so it returned only 6 decimals – 12.456734
- We specified width as 8. so it returned only 6 decimals – 12.45673445
- We specified width as 2. so it returned only 6 decimals – 12.45

**Example 2:**

Consider the 5 floating point numbers in a list and return the result in a fixed width.

# Consider a float values with different decimals in a list values = [12.456734455,5.6789,9.232345,7.89998,8.00122] # Get upto 3 decimals for i in values: print ('value upto 3 decimals - %.6f'%i) # Get upto 2 decimals for i in values: print ('value upto 2 decimals - %.2f'%i)

**Output:**

value upto 3 decimals - 12.456734 value upto 3 decimals - 5.678900 value upto 3 decimals - 9.232345 value upto 3 decimals - 7.899980 value upto 3 decimals - 8.001220 value upto 2 decimals - 12.46 value upto 2 decimals - 5.68 value upto 2 decimals - 9.23 value upto 2 decimals - 7.90 value upto 2 decimals - 8.00

We returned floating numbers in a list with widths of 3 and 2 separately.

## Format a floating number to fixed width using round()

The round() function is used to round the given float value to a specified width. It rounds to the nearest value.

**Syntax:**

round(value,width)

It returns a fixed width float point number.

**Parameters:**

1. value specifies float value

2. width specifies the number of decimals to be returned.

**Example:**

In this example, we will round the value – 12.456734455 to 6,8 and 2 separately.

# Consider a float value with 9 decimals value = 12.456734455 # Get upto 6 decimals print ("value upto 6 decimals",round(value,6)) # Get upto 8 decimals print ("value upto 8 decimals",round(value,8)) # Get upto 2 decimals print ("value upto 2 decimals",round(value,2))

**Output:**

value upto 6 decimals 12.456734 value upto 8 decimals 12.45673445 value upto 2 decimals 12.46

- 12.456734455 is rounded to 12.456734 by specifying a width as 6.
- 12.456734455 is rounded to 12.45673445 by specifying a width as 8.
- 12.456734455 is rounded to the nearest value – 12.46 by specifying a width as 2.

## Format a floating number to fixed width using format()

The format() is used to round the given float value to a specified width. It rounds to the nearest value.

**Syntax:**

"{:.nf}".format(value)

Where n specifies the width and value is the floating point number.

**Example:1**

In this example, we will format the value – 12.456734455 to 4,8, and 2 separately.

# Consider a float value with 9 decimals value = 12.456734455 # Get upto 4 decimals print ("value upto 6 decimals - {:.4f}".format(value)) # Get upto 8 decimals print ("value upto 8 decimals - {:.8f}".format(value)) # Get upto 2 decimals print ("value upto 2 decimals - {:.2f}".format(value))

**Output:**

value upto 6 decimals - 12.4567 value upto 8 decimals - 12.45673445 value upto 2 decimals - 12.46

- 12.456734455 is formatted to 12.4567 by specifying a width as 4.
- 12.456734455 is formatted to 12.45673445 by specifying a width as 8.
- 12.456734455 is formatted to the nearest value – 12.46 by specifying a width as 2.

**Example:2**

In this example, we will format the value – 89.01123443535 to 6,8 and 2 separately.

# Consider a float value with 11 decimals value = 89.01123443535 # Get upto 6 decimals print ("value upto 6 decimals - {:.6f}".format(value)) # Get upto 8 decimals print ("value upto 8 decimals - {:.8f}".format(value)) # Get upto 2 decimals print ("value upto 2 decimals - {:.2f}".format(value))

**Output:**

value upto 6 decimals - 89.011234 value upto 8 decimals - 89.01123444 value upto 2 decimals - 89.01

## Summary

In this Python tutorial, we have seen how to format a floating point number to a fixed width using round(), format and % operator. The round() and format() methods operates with the same functionality. Thanks.