Variable / Bound Variable / Free Variable / Scope / Closure
1. Name Binding / Name Resolution / Variable / Indentifier / Value / Reference
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Algorithm Quizzes
Quiz 1
Subarray / Substring / Subsequence
Subsequence
LeetCode: Stock Problems
0. 文字游戏
Python: enumerate()
1. enumerate(start=0)
Python: Be cautious when using generators/iterators in nested loops
Simply because generators/itertors would drain.
Python: It’s safe to slice a list with index out of range
用单个下标 access 直接返回 list 的单个 element，用 slice (或者严格一点说是用一个 slice object 去 access) 返回一个 sub-list，这俩都是很常见的操作。但是：
Python: calling static methods within the same class / recursive static methods
假设我们有一个 class Test，有一个 @staticmethod foo：
Python: sorted() vs list.sort()
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