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In Python, it is tedious to write:
print "foo is" + bar + '.' Can I do something like this in Python?
print "foo is #{bar}."
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Python 3.6 added new string interpolation method called literal string interpolation and introduced a new literal prefix f . This new way of formatting strings is powerful and easy to use. It provides access to embedded Python expressions inside string constants.
There are a number of different ways to format strings in Python, one of which is done using the % operator, which is known as the string formatting (or interpolation) operator.
String interpolation is a technique that enables you to insert expression values into literal strings. It is also known as variable substitution, variable interpolation, or variable expansion. It is a process of evaluating string literals containing one or more placeholders that get replaced by corresponding values.
String interpolation is a process of injecting value into a placeholder (a placeholder is nothing but a variable to which you can assign data/value later) in a string literal. It helps in dynamically formatting the output in a fancier way. Python supports multiple ways to format string literals.
Python 3.6+ does have variable interpolation - prepend an f to your string:
f"foo is {bar}" For versions of Python below this (Python 2 - 3.5) you can use str.format to pass in variables:
# Rather than this: print("foo is #{bar}") # You would do this: print("foo is {}".format(bar)) # Or this: print("foo is {bar}".format(bar=bar)) # Or this: print("foo is %s" % (bar, )) # Or even this: print("foo is %(bar)s" % {"bar": bar}) Python 3.6 will have has literal string interpolation using f-strings:
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