本文介绍了三种常见的Python模块导入方法：1.从特定模块导入单个功能；2.从模块导入所有内容，但此方法存在命名冲突风险；3.导入整个模块。推荐使用第一种方法以避免不必要的问题。
there are several ways to import module to Python, like:
1. from math import pi, sqrt
recommended
2. from math import *
don't use it unless you have a good reason, and you understand the risk it will bring to you.
some of the names defined in the module may conflict with names already in the current namespace( or being imported from other module), and the import causes the new definitions to replace existing ones.
3. import math
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