AW: [Tutor] (no subject)

[Werkstudent 010]

Thanks Michael,

I believe, that which had stumped me, was my use of doulbe instead of single quotes when trying to pass my argument tuple. It resulted in each letter of a string being considered a seperate argument, and my called routines screamed about too many arguments, until it occured to me, to use skinny quotes.

Thanks again,
David Ungemach

-----Ursprüngliche Nachricht-----
Von: Michael P. Reilly [mailto:arcege@shore.net]
Gesendet am: Montag, 5. Juli 1999 15:54
An: Werkstudent 010
Cc: tutor@python.org
Betreff: Re: [Tutor] (no subject)

[Charset iso-8859-1 unsupported, filtering to ASCII...]
> 
> Greetings,
> 
> the thread module allows one to start a new thread with "thread.start_new_thread(routine-name, (tuple))",
> but what does it do under internall? I want to execute a method by passing it in a similar manner, with its tuple of arguments, e.g. "doit(routine-name, (tuple))". How do I get my python interpreter to believe me. What is the sequence of "routine-name" and tuple that my python interpreter needs from me, complete with parenthesis, or none, etc. etc.?
> 
> thanks

David,

Python has a function to call functions in the fashion you want, called
"apply".  The format is:
  retvalue = apply(function, args[, keywds])

The function must be a function object or bound method, args must be a
tuple, and the optional keywds should be a dictionary.

>>> def foo(a, b=1, *c, **d):
...   print a, b, c, d
...
>>> foo(1)
>>> apply(foo, (1,))
1 1 () {}
>>> foo(1, 2, 3)
1 2 (3,) {}
>>> apply(foo, (1, 2, 3))
1 2 (3,) {}
>>> foo(1, b=2, c=3)
1 2 () {'c': 3}
>>> apply(foo, (1,) {'b': 2, 'c': 3})
1 2 () {'c': 3}
>>>

The start_new_thread() function is similar, but must start differently
because of how threads are started.  I suggest reading the source if you
are really interested (Modules/threadmodule.c), but it is not important
for what it seems you need. :)

For more information, read:
  Python Language Reference, section 5.3.4: "Calls"
    http://www.python.org/doc/current/ref/calls.html
  Python Language Reference, section 7.5: "Function definitions"
    http://www.python.org/doc/current/ref/function.html
  Python Library Reference, section 2.3 "Built-in Functions: apply"
    http://www.python.org/doc/current/lib/built-in-funcs.html#l2h-181

  -Arcege

-- 
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| Michael P. Reilly, Release Engineer | Email: arcege@shore.net        |
| Salem, Mass. USA  01970             |                                |
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