理解pandas.get_dummies

• get_dummies

  pandas.get_dummies(data, prefix=None, prefix_sep='_', dummy_na=False, columns=None,sparse=False, drop_first=False, dtype=None) -> 'DataFrame'

  Convert categorical variable into dummy/indicator variables.

  It’s a function which can turn a categprical variable into a series of zeros and ones, which makes them a lot easier to quantify and compare.

  不管是輸入的是Series還是DataFrame，get_dummies()提取兩個關鍵概念,return 一個DataFrame。

  返回的DataFrame，columns是所有元素的枚舉，index是源數據的記錄條目數。如果源數據中爲NaN，則新增一條記錄，全0。

• References

1. pandas
2. The Dummy’s Guide to Creating Dummy Variables