byarg.py

def __getattr__(self, name):
    return lambda *p, **kw: self.callapi(name, *p, **kw)

def callapi(self, name, *p, **kw):
    if 'context' in kw:
        context = kw['context']
        del kw['context']
    else:
        context = self.getContext()
    # ... call modules

bymethod.py

def context(self, context):
    return WrappedWillie(context)

def __getattr__(self, name):
    return lambda *p, **kw: self.callapi(name, *p, **kw)

def callapi(self, name, *p, **kw):
    context = self.getContext()
    # ... call modules