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Python相关概念列表和字典区别- ListLists are just like the arrays, declared in other languages. Lists need not be homogeneous always which makes it a most powerful tool in Python. A single list may contain DataTypes like Integers, Strings, as well as Objects. Lists

数学特征值(eigenvalue)和特征向量(eigenvector)Certain exceptional vectors x are in the same direction as Ax. Those are the “eigenvectors”. Multiply an eigenvector by A, and the vector Ax is a number λ times the original x.The basic equation is Ax= λx. The number λ