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列表解析的语法为:[expr for iter_item in iterable if cond_expr]
元组(tuple)的初始化语法为:(expr for iter_item in iterable if cond_expr)
集合(set)的初始化语法为:{expr for iter_item in iterable if cond_expr}
字典(dict)的初始化语法为:{expr1, expr2 for iter_item in iterable if cond_expr}