Python Format Strings

String Format

In the chapter on Python Variables, we discovered that it is not possible to mix strings and numbers together, as shown in the following example:

Example

weight = 60
line = "I'm Abc, my weight is " + weight
print(line)

However, there is a clever way to combine strings and numbers in Python by utilizing the format() method!

You can use the format() method to insert values into a string by placing them inside curly braces {}:

Example

To insert numbers into strings, you can utilize the format() method:

weight = 60
line = "I'm Abc, my weight is {}"
print(line.format(age))

Note: The format() method allows you to include an unlimited number of arguments, which will be placed in the corresponding placeholders within the string:

Example

quantity = 4
item_no = 150
price = 65.67
my_order = "He desires to acquire {} item {} for the price of {} dollars"
print(my_order.format(quantity, item_no, price))

To ensure that the arguments are placed in the correct placeholders, you can use index numbers like {0} within the format() method. This way, each argument will be assigned to the designated placeholder based on its corresponding index number:

Example

quantity = 4
item_no = 150
price = 65.67
my_order = "He wishes to pay {2} for {0} piece of item {1}."
print(my_order.format(quantity, item_no, price))