Displaying Integers with the format() Function

Using the format() function, you can output strings in various formats.

Specifying the format of the output data is called formatting, and you use a colon : inside the braces { } to define the display format.

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"{:format_option}".format(value)

• { } : Placeholder indicating where to insert the value

• : : Specifies format options

To output integers, use {:d} by putting d to the right of the colon inside the braces.

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number = 123

# Integer output
formatted = "number: {:d}".format(number)
print(formatted)  # "number: 123"

If you omit d, Python will automatically use the appropriate format based on the type of the value.

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number = 123

# Integer output
formatted = "number: {}".format(number)
print(formatted)  # "number: 123"

Using a number to the right of the colon specifies the width of the resulting string.

For instance, {:5} sets the width of the output string to 5.

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number = 123
formatted = "number: {:5}".format(number) # Set width to 5

# Inserts 2 spaces before 123
print(formatted)  # "number:   123",

If you want to pad the width with zeros, prefix the width with 0.

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number = 123
formatted = "number: {:05}".format(number) # Set width to 5

# Inserts 2 zeros before 123
print(formatted)  # "number: 00123"

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