将 Pandas 数据框中的相同字符串转换为相应的数字

Question

So if I have a column of a pandas dataframe that looks like this :

x

FWD

MID

DEF

GK

MID

Is there anyway I can convert these strings to numbers with identical values taking the same number like this :

x

0

1

2

3

1

Answer 1

You can rank your column (assuming df is your input data frame)

df["x"] = df["x"].rank(method='dense').astype(int)

Ref.https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.rank.html