Python: pprint.pformat can be a good friend of str
```python import pprint
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Python: Use datatime instead of time for local clocks
Effective Python Item 45: Use datetime Instead of time for Local Clocks
Python: all
Effective Python Item 50: Use Packages to Organize Modules and Provide Stable APIs
pdb: Your interactive python debugger
Effective Python Item 57: Consider Interactive Debugging with pdb
Python: 3 ways to use metaclasses
Effective Python Item 33: Validate Subclasses with Metaclasses
Python: Referencing and assignment in inner functions
这一篇的内容在 Digest of Fluent Python: 7.4 Variable Scope Rules 和 Python: Variable scope in if-statement 都有讲到，但是 Effective Python 的 Item 15: Know How Closures Inte...
Python: for-else with break
Python Tips: 19. For - Else:
Python: Diamond Inheritance and super
参 Effective Python Item 25: Initialize Parent Classes with super。