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Practice

Handling Floating-Point Numbers with the format() Function

To output real numbers with decimals, use {:f}.

Inside the curly braces, the f format specifier is used to output floating-point (decimal) numbers.

In programming, floating-point number refers to a real number in which the decimal point can move (or float) within the number.


You can specify the number of decimal places by placing .number after the colon : in the format string.

For example, {:.2f} displays the number with exactly two decimal places.

Floating point formatting example
float_number = 123.4567
formatted_float = "float_number: {:.2f}".format(float_number)

print(formatted_float)  # "float_number: 123.46"

Outputting in Scientific Notation​

Use {:e} to display floating-point numbers in scientific (exponential) notation.

For example, formatting 123.456789 in scientific notation results in 1.23e+02.

Scientific notation example
float_number = 123.456789

scientific_formatted = "{:.2e}".format(float_number)

print(scientific_formatted)  # "1.23e+02"

Removing Decimal Places​

To remove the decimal places from a floating-point number, use :.0f.

Removing insignificant decimals
number = 123.0

formatted_number = "{:.0f}".format(number)  # Displays the number without decimal places

print(formatted_number)  # "123"

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