How does Python Achieve String Interpolation Similar to Ruby's #{} Syntax?

Python's Equivalent to Ruby's String Interpolation

In Ruby, string interpolation is achieved using the #{} syntax. For instance:

name = "Spongebob Squarepants"
puts "Who lives in a Pineapple under the sea? \n#{name}."

Question: Is there a comparable mechanism in Python for interpolating strings?

Answer:

Starting with Python 3.6, string interpolation syntax was introduced, resembling Ruby's #{} interpolation. In Python 3.6 and later, the f-strings syntax allows expressions to be embedded in strings, as follows:

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

Prior to Python 3.6, the % operator was commonly employed for string interpolation. The first operand is the string to be interpolated, while the second can be a "mapping" that associates field names with values to be interpolated.

To achieve string interpolation using Python's .format() method:

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

Finally, the string.Template class provides an alternative approach:

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

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