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Python format()

The format() method used to return a formatted representation of the specified value. It is handled by the format specifier and inserts the formatted string inside the string's placeholder.The placeholders can be represented using numbered indexes {0},named indexes {price}, or even empty  {}.The format() is similar to the 'String format' method, both methods call __format__() method of an object.

format(value[, format_spec]) #Where value can be a integer, float or binary format.

format() Parameters:

This function takes two parameters:In this format_spec  could be in the format


where, the options are
fill        ::=  any character
align       ::=  "<" | ">" | "=" | "^"
sign        ::=  "+" | "-" | " "
width       ::=  integer
precision   ::=  integer
type        ::=  "b" | "c" | "d" | "e" | "E" | "f" | "F" | "g" | "G" | "n" | "o" | "s" | "x" | "X" | "%"

Parameter Description Required / Optional
Value The value that needs to be formatted     Required
format_spec The specification on how the value should be formatted.     Required

format() Return Value

Input Return Value
format specifier. formatted representation 

Examples of format() method in Python

Example 1:Number formatting with format()

# d, f and b are type

# integer
print(format(123, "d"))

# float arguments
print(format(123.4567898, "f"))

# binary format
print(format(12, "b"))



Example 2: Number formatting with fill, align, sign, width, precision and type()

# integer 
print(format(1234, "*>+7,d"))

# float number
print(format(123.4567, "^-09.3f"))



Example 3: Using format() by overriding __format__()

# custom __format__() method
class Person:
    def __format__(self, format):
        if(format == 'age'):
            return '23'
        return 'None'

print(format(Person(), "age"))