## 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.

# Task

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`

.

Everything was clear?

Course Content

# String Manipulation in Python

String Manipulation in Python

## 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.

# Task

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`

.

Everything was clear?