How can I achieve string interpolation in Python like Ruby?

Python's Equivalent to Ruby's String Interpolation

Ruby's string interpolation, which allows for easy inclusion of expressions within a string, has a Python equivalent in various forms.

Format String Interpolation (f-strings)

Python 3.6 and later introduced "f-strings," which enable literal string interpolation. Expressions can be directly inserted using the syntax:

name = "Spongebob Squarepants"
print(f"Who lives in a Pineapple under the sea? {name}.")

String Interpolation with the % Operator

Prior to Python 3.6, string interpolation can be achieved using the % operator. The first operand is the string to be interpolated, while the second operand can be a mapping that matches field names to values. For example:

name = "Spongebob Squarepants"
print("Who lives in a Pineapple under the sea? %(name)s." % locals())

String Interpolation with .format() Method

Recent Python versions also provide the .format() method for string interpolation:

name = "Spongebob Squarepants"
print("Who lives in a Pineapple under the sea? {name!s}.".format(**locals()))

String.Template Class

Another option is to use the string.Template class:

tmpl = string.Template("Who lives in a Pineapple under the sea? $name.")
print(tmpl.substitute(name="Spongebob Squarepants"))

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