目录函数np.append(arr, values, axis=None)作用：参数：返回：e.g.np.append存在的一些问题1. np.append太慢了2. np.append函数typeerror函数np.append(arr, values, axis=None)
When I started to write the first SQL-Statements in my programs I felt quite comfortable with protecting myself against SQL-Injection with a very simple method that a colleague showed me. It replaced
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