Python: Formatting a string using variable names placeholders

Have you tried s="svn cp {root_dir}/{trunk}/ {root_dir}/{tag}/".format(**locals()) ?

You can use locals() function

s="svn cp {root_dir}/{trunk}/{root_dir}/{tag}/".format(**locals())

EDIT:

Since python 3.6 you can use string interpolation:

s = f"svn cp {root_dir}/{trunk}/{root_dir}/{tag}/"

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