Python string interpolation using dictionary and strings

Question

Given:

dict = {\"path\": \"/var/blah\"}
curr = \"1.1\"
prev = \"1.0\"

What\'s the best/shortest way to interpolate the string to generate t

Answer 1

Maybe:

path = dict['path']
str = "path: %(path)s curr: %(curr)s prev: %(prev)s" % locals()

I mean it works:

>>> dict = {"path": "/var/blah"}
>>> curr = "1.1"
>>> prev = "1.0"
>>> path = dict['path']
>>> str = "path: %(path)s curr: %(curr)s prev: %(prev)s" % locals()
>>> str
'path: /var/blah curr: 1.1 prev: 1.0'

I just don't know if you consider that shorter.

Answer 2

Update 2016: As of Python 3.6 you can substitute variables into strings by name:

>>> origin = "London"
>>> destination = "Paris"
>>> f"from {origin} to {destination}"
'from London to Paris'

Note the f" prefix. If you try this in Python 3.5 or earlier, you'll get a SyntaxError.

See https://docs.python.org/3.6/reference/lexical_analysis.html#f-strings