<<Effective Python>>读书记录

1. Pylint(www.pylint.org)
2. zip，itertools.zip_longest
3. 带星号unpacking，header, *rows = it
4. python --strict
5. defaultdict
6. __missing__
7. 闭包 nonlocal 变量
8. when: Optional[datetime]=None，注解类型要么为datetime，要么为None
9. 函数参数, /左边只能按位置给定, *右边只能个按关键字形式指定
10. functools.wraps
11. 字典和集合推导{}
12. 不要返回整个列表，返回生成列表的值yield
13. __iter___
14. 列表生成式使用小括号()
15. yield from
16. send, yield

itertools.chain
itertools.repeat
itertools.cycle
itertools.islice
itertools.takewhile
itertools.dropwhile
itertools.filterfalse
itertools.accumulate
itertools.product
itertools.permutations
itertools.combinations
itertools.combinations_with_replacement

18. ThreadPoolExecute

subprocess.run
subprocess.Popen
from threading import Lock
from collections import deque
from queue import Queue

from contextlib import contextmanager
bisect
headq
memorview
bytearray

21. unittest, pdb, tracemalloc