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float_number = 123.456789

# Output with 2 decimal places
formatted_float_two_decimal = "{:.2f}".format(float_number)
print("formatted_float_two_decimal:", formatted_float_two_decimal)
print('=' * 30)

# Output using scientific notation with 4 decimal places
formatted_scientific = "{:.4e}".format(float_number)
print("formatted_scientific:", formatted_scientific)
print('=' * 30)

# Output with a fixed width of 10 characters and 2 decimal places
formatted_fixed_width = "{:10.2f}".format(float_number)
print("formatted_fixed_width:", formatted_fixed_width)
print('=' * 30)

# Output with no decimal places
formatted_no_decimal = "{:.0f}".format(float_number)
print("formatted_no_decimal:", formatted_no_decimal)

# 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.

<br />

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.*

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

print(formatted_float)  # "float_number: 123.46"
```

<br />

## 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`.

```python title="Scientific notation example"
float_number = 123.456789

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

print(scientific_formatted)  # "1.23e+02"
```

<br />

## Removing Decimal Places

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

```python title="Removing insignificant decimals"
number = 123.0

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

print(formatted_number)  # "123"
```

{:.3f} indicates formatting to print up to 3 decimal places.

### How would you format `float_number` to print to 3 decimal places?

Handling Floating-Point Numbers with the format() Function

Outputting in Scientific Notation

Removing Decimal Places

How would you format float_number to print to 3 decimal places?

How would you format `float_number` to print to 3 decimal places?