Formatting using format() method in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the format() method do in Python?

It inserts values into a string at placeholders marked by curly braces {}, allowing you to create formatted strings easily.

beginner

How do you insert multiple values using format()?

Use multiple curly braces {} in the string and pass the values in order to format(). For example: '{} {}'.format('Hello', 'World') results in 'Hello World'.

intermediate

How can you specify the order of values in format()?

Use numbers inside the curly braces to indicate the position of the argument. For example: '{1} {0}'.format('first', 'second') results in 'second first'.

intermediate

How do you format a number to show 2 decimal places using format()?

Use a format specifier inside the braces like {:.2f}. For example: '{:.2f}'.format(3.14159) results in '3.14'.

intermediate

What happens if you use named placeholders in format()?

You can name placeholders like {name} and pass values as keyword arguments. For example: 'Hello {name}'.format(name='Alice') results in 'Hello Alice'.

What will '{} {}'.format('Good', 'Morning') output?

A 'Good Morning'

B '{} {}'

C 'Morning Good'

D 'Good{}Morning'

The format() method replaces the curly braces with the values in order, so it outputs 'Good Morning'.

How do you format the number 7.12345 to show only 3 decimal places?

A '{:.3}'.format(7.12345)

B '{3f}'.format(7.12345)

C '{:.3f}'.format(7.12345)

D '{3}'.format(7.12345)

The format specifier {:.3f} means 3 decimal places floating point.

What does '{1} {0}'.format('first', 'second') output?

A 'first second'

B 'second first'

C '{1} {0}'

D 'first first'

The numbers inside braces specify the argument index, so {1} is 'second' and {0} is 'first'.

Which is the correct way to use named placeholders?

A 'Hello {0}'.format(name='Bob')

B 'Hello {}'.format(name='Bob')

C 'Hello {name}'.format('Bob')

D 'Hello {name}'.format(name='Bob')

Named placeholders require matching keyword arguments in format().

What will 'Price: ${:.2f}'.format(4.5) output?

A 'Price: $4.50'

B 'Price: $4.5'

C 'Price: ${:.2f}'

D 'Price: $4'

The number is formatted to 2 decimal places, so 4.5 becomes 4.50.

Explain how to use the format() method to insert multiple values into a string.

Think about how you write placeholders and how you pass values to fill them.

Describe how to format a floating-point number to show exactly two decimal places using format().

Look for the part inside the curly braces that controls decimal places.