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Advanced Formatting: Float, Round, and Percent

Within a simple {} block, we can round a float number with the necessary precision, or represent a number as a percent.

Let's consider the pattern we will use in this chapter:

{:[thousands separator].[number][type]}

Please note, that like in the previous chapters, we don't need to place square brackets (I placed it for convenience).

[thousands separator] - the symbol used to separate every thousand (possible values are , and _).
[number] - is the precision, number of decimal places (used for rounding number).
[type] - type of number representing (e - scientific notation, % - percentage (will multiply number by 100), g - general format, f - fixed-point notation). You can dive deeper into possible options in Python documentation.


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print("Original number: {0}, formatted number: {0:.2f}".format(255/8))
print("Original number: {0}, formatted number: {0:.2%}".format(15/48))
print("Original number: {0}, formatted number: {0:,.2f}".format(35*6327))

Task

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As of 2020, the population of the USA was 331002651. The total land area is 9147420 sq.km. Population density is the population-to-area ratio. Your tasks are:

Format the first string so the population and area will be printed in format: 9,147,420, and insert variables in the correct order.
Within the second .format function calculate the population density and format the number in format 28.45.

Solution

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Section 3. Chapter 8

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Advanced Formatting: Float, Round, and Percent

Within a simple {} block, we can round a float number with the necessary precision, or represent a number as a percent.

Let's consider the pattern we will use in this chapter:

{:[thousands separator].[number][type]}

Please note, that like in the previous chapters, we don't need to place square brackets (I placed it for convenience).

[thousands separator] - the symbol used to separate every thousand (possible values are , and _).
[number] - is the precision, number of decimal places (used for rounding number).
[type] - type of number representing (e - scientific notation, % - percentage (will multiply number by 100), g - general format, f - fixed-point notation). You can dive deeper into possible options in Python documentation.


              123
            
print("Original number: {0}, formatted number: {0:.2f}".format(255/8))
print("Original number: {0}, formatted number: {0:.2%}".format(15/48))
print("Original number: {0}, formatted number: {0:,.2f}".format(35*6327))

Task

Swipe to start coding

As of 2020, the population of the USA was 331002651. The total land area is 9147420 sq.km. Population density is the population-to-area ratio. Your tasks are:

Format the first string so the population and area will be printed in format: 9,147,420, and insert variables in the correct order.
Within the second .format function calculate the population density and format the number in format 28.45.

Solution

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 3. Chapter 8

Switch to desktop for real-world practiceContinue from where you are using one of the options below