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This documentation http://docs.python.org/2/c-api/arg.html#PyArg_UnpackTuple describes all the parameters of function, except for const char *name.
What is this parameter for? What should I put there and why?
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foo("string") passes a Python str object to a C function which will later assign the string to char *c_ptr .
The terms parameter and argument can be used for the same thing: information that are passed into a function. From a function's perspective: A parameter is the variable listed inside the parentheses in the function definition. An argument is the value that are sent to the function when it is called.
A PyObject is in fact just a Python object at the C level. And since integers in Python are objects, they are also PyObject s. It doesn't matter whether it was written in Python or in C, it is a PyObject at the C level regardless.
Almost the entire Python interpreter can be summarized into one C-level function: PyEval_EvalFrameEx. This function is the interpreter loop. Consisting of 3k lines of code, its job is to evaluate a frame, or in other words, run it.
According to the Python source (Python/getargs.c), the name argument is used when raising exceptions. So it could be the name of the function/method in which you use PyArg_UnpackTuple.
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