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One may wish to also pass a parameter from the calling code into the name space used inside the Spyce code so that it may be accessed from Python Statements, Chunks, Expressions, etcetera. Something analogous to Python's own execfile built-in function where you can pass a locals and globals dictionary.

Spyce code to be invoked is dealt with similar to a function body, and hence one can send parameters to that "function" upon invocation. The arguments sig, args and kwargs are used to control such parameter passing. With sig, a signature for this external code is specified, with args and kwargs values for the actual arguments are passed. Thus, sig controls what can go into args and kwargs:

• sig
  is a string containing a function signature in usual python syntax, without surrounding brackets.
  For example: 'x, y, a=None, b={}'.
• args
  is a list of values, each value corresponding to a positional argument specified in sig, in order.
• kwargs
  is a dictionary of name to value mappings, its keys should be in the list of keyword argument names specified in sig, its values provide actual values to be passed.