pythonstring-formattingstring-interpolation

Does Python do variable interpolation similar to "string #{var}" in Ruby?

In Python, it is tedious to write:

print "foo is" + bar + '.'

Can I do something like this in Python?

print "foo is #{bar}."

Solution

  • 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})