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  1. class Context(dict):
  2. def __getitem__(self, k):
  3. return super(Context, self).get(k, '{%s}' % k)
  4.  
  5. ctx = Context(source='foo', name='bar')
  6. print("{source}/static/{name}-{version}.min.css".format(**ctx))
Runtime error #stdin #stdout #stderr 0.02s 9016KB
stdin
Standard input is empty
stdout
Standard output is empty
stderr
Traceback (most recent call last):
  File "prog.py", line 6, in <module>
KeyError: 'version'