目录1.np.c_的用法2.np.r_的用法np.r_是按列连接两个矩阵，就是把两矩阵上下相加，要求列数相等。np.c_是按行连接两个矩阵，就是把两矩阵左右相加，要编程客栈求行数相等。
When I create a thread I s开发者_如何学Cave it handle in a list. After a time I want to check which of them still exists.
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