On Thu, Sep 23, 2010 at 1:51 PM, Tarek Ziadé firstname.lastname@example.org wrote:
Why are you thinking about unit tests ? Don't you ever use issubclass/isinstance in your programs ?
Checking signatures using ABC when you create a plugin system is one use case for instance.
This is something that I have implemented (before ABCs) in plugin systems I use. When loading the plugin I validate all methods exist and that each method has the correct number of required arguments, I generally dont check argument name as my plugin systems all pass by position instead of keyword. If the signature I am checking contains *args it automatically passes the check. If the plugin fails the check I dont load it.
On Thu, Sep 23, 2010 at 2:01 PM, Antoine Pitrou email@example.com wrote:
Again, why do you want to check signatures? Do you not trust plugin authors to write plugins?
No, no I dont. I have had several plugin authors come to me complaining that the plugin system is broken because it wont load their plugin (even with a fairly detailed error message).
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