module question

[张少驰]

  I have a question about a module's attribute and method.How can I know which attribute and method a method has? For example,the module os has attribute 'WNOHANG' and method os.wait() . 
My next question is os module may use waitpid method,as like os.waitpid(ret,os.WNOHANG),How can I know the relevant value of os.WNOHANG . If I use os.waitpid(ret,0),I want to know what this 0 relevantly refers? (I really don't know what this 0 refers to? ,please tell me)
Any idea will be appreciated.

Regards,
Edward
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