no_var_expand(magic_func)
By default, IPython interprets :None:None:`{a}` or :None:None:`$a` in the line passed to magics as variables that should be interpolated from the interactive namespace before passing the line to the magic function. This is not always desirable, e.g. when the magic executes Python code (%timeit, %time, etc.). Decorate magics with :None:None:`@no_var_expand` to opt-out of variable expansion.
Mark a magic function as not needing variable expansion
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