Scott David Daniels wrote:
kj wrote:
Suppose that f is an object whose type is 'function'.
Is there a way to find out f's list of formal arguments?
The reason for this is that I'm trying to write a decorator and
I'd like the wrapper to be able to check the number of arguments
passed....but I'm missing something like the hypothetical attribute
FORMAL_ARGS above.
I can write a wrapper now:
def tracer(function):
def internal(*args, **kwargs):
print('calling %s(%s)' % (function.__name__,
', '.join([repr(arg) for arg in args] +
['%s=%r' % ka for ka in sorted(kwargs)])))
result = function(*args, **kwargs)
print('=> %r' % result)
return internal
and call like so:
tracer(math.sin)(3.1415 / 6)
calling sin(0.5235833333333334)
=> 0.49998662654663256
What would your missing something be for tracer(math.sin)?
--Scott David Daniels
scott.dani...@acm.org
=========================
Scott;
I'm lost with this.
If you use the same and add that it prints both the first_token/second
and the first_token multiplied by second and pass it (pi, 6, 7) what
happens then?
ie - function mysin only expects pi and 6 and is to print both pi/6 and
pi*6. The 7 is an error, not supposed to be there.
Steve
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