6.4 pass语句 The pass statement

pass_stmt  ::=  "pass"
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pass is a null operation -- when it is executed, nothing happens. It is useful as a placeholder when a statement is required syntactically, but no code needs to be executed, for example:

pass 是一个空操作 -- 当执行它, 什么也不做. 它在句法上要求有一个语句时但不需要写代码时用到,例如:

def f(arg): pass    # a function that does nothing (yet)

class C: pass       # a class with no methods (yet)