Str.format()
str.format() works by putting in one or more replacement fields and placeholders defined by a pair of curly braces { } into a string. The value we wish to put into the placeholders and concatenate with the string passed as parameters into the format function.
Example: Formatting strings using the format() method.
Python3
n1 = 'Hello'n2 = 'w3wiki'# for single substitutionprint('{}, {}'.format(n1, n2)) |
Hello, w3wiki
We can also use the variable name inside the curly braces {}. This will allow us to use the parameters of format functions in any order we want.
Example: Format functions with variables inside curly braces.
Python3
n1 = "Hello"n2 = "w3wiki"# for single or multiple substitutions# let's say b1 and b2 are formal parameters# and n1 and n2 are actual parametersprint("{b1}! This is {b2}.".format(b1=n1, b2=n2))# we can also change the order of the # variables in the string without changing # the parameters of format functionprint("{b2}! This is {b1}.".format(b1=n1, b2=n2)) |
Hello! This is w3wiki. w3wiki! This is Hello.
Note: To know more about str.format(), refer to format() function in Python
Python String InterpolationPython String Interpolation
String Interpolation is the process of substituting values of variables into placeholders in a string. Let’s consider an example to understand it better, suppose you want to change the value of the string every time you print the string like you want to print “hello <name> welcome to geeks for geeks” where the <name> is the placeholder for the name of the user. Instead of creating a new string every time, string interpolation in Python can help you to change the placeholder with the name of the user dynamically.
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