Python: raise / 3 key elements of an exception
1. raise-statement in Python 2
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Python: except
简单说一下。except 可以接一个 tuple 表示捕捉多种类型的异常，也可以不带任何参数表示捕捉 everything（当然这是一个 anti-pattern）。
Python: with-statement / variable scope in with-statement
with-statement
Python: try-except-else-finally
Python 的 try-except-finally 和 Java 的 try-catch-finally 其实是一样的，烦就烦在中间那个 else 上：
Python: Variable scope in if-statement
In Java, this is wrong and you cannot even compile:
Python: Query reference sequences using rpy2 and BSgenome
Usually this job is done in R, as deescribed in Using R + Bioconductor to Get Flanking Sequence Given Genomic Coordinates. An R sample could be this simple:
Python: List multiplication is actually repetition
之前遇到过这么一个例子：
Python: Iterating a file by every 2 lines
一个有点鸡贼的方法：
Handy Python Profiler: line_profiler + kernprof
Just take a look at an exemplar output and you’ll know what they are designed for.
Binary Encoding vs One hot Encoding
需要注意的是：one-hot encoding 应该是 binary encoding 的特殊情况。one-hot 的意思就是：只有一个 bit 是高位（1）；类似还有 one-cold encoding