我有一个包含两列的数据框，“主要一个”和“主要两个”。 如何创建一个新专栏“专业”？

Question

For example, currently my data looks like (mockup):

In:

print(pandas.pivot_table(dataframe,values='id',index=['major_one','major_two'],columns='status',aggfunc='count',fill_value=fill_character),'\n')

Out:

status               Registered  Withdrawn
major_one major_two                       
ENGL      BIOL                3          0
          FILM               10          0
BIOL      FILM                4          0
          ENGL                7          1

I want it to look like:

status  Registered  Withdrawn
majors                       
ENGL           27          1
BIOL            3          0
FILM           14          0

Answer 1

You could try melting your original dataframe before pivoting so that you have a single "majors" column and THEN pivot on the majors column as your index.

eg

# pd.melt(df, value_vars = ["major_one", "major_two"], var_name = "major")
# READ EDIT INSTEAD

Read the docs accordingly, the snippet above is based off what I imagine your input data looks like, but you haven't posted a sample at all.

EDIT:

pd.melt(df, value_vars = ['major_one', 'major_two'], var_name = 'major_number', value_name = "major", id_vars = ['id', 'status'])