Python常用标准库

1. builtin
2. os
3. random
4. logging
5. re
6. collections
7. itertools
8. time/datetime
9. threading
10. multiprocessing
11. subprocess
12. unittest
13. copy
14. weakref
15. importlib
16. tempfile
17. pathlib
18. functools
19. operator
20. secrets
21. typing

Decimal
偏函数、高阶函数（partial等）
secrets
tempfile
pdb
unittest: setUpClass() -> setUp() -> test1() -> tearDown() -> setUp() -> test2() -> tearDown() ->…-> tearDownClass
subprocess：shell=False
yaml
类的继承与派生
装饰器
super的作用