源码中不知道用途

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#1 Created at ... [Delete] [Delete and Lock User]

def create_args_string(num): L = [] for n in range(num): L.append('?') return ', '.join(L)

这部分是干什么的以及最后‘，’.join(L)是什么意思求解答

#2 Created at ... [Delete] [Delete and Lock User]

这个函数主要是生成一个'?, ?, ?, ?'的SQL语句的参数，可以用', '.join('?' * len(mappings)来代替，其他SQL语言简化可以参考orm.py

attrs['__insert__'] = 'insert into `%s` (%s) values (%s)' % (table, ', '.join('`%s`' % f for f in mappings), ', '.join('?' * len(mappings)))

#3 Created at ... [Delete] [Delete and Lock User]

谢啦

#4 Created at ... [Delete] [Delete and Lock User]

刚写了注释，欢迎指教。