make a column an index pandas code example
Example 1: pandas create a column from index
df.reset_index(level=0, inplace=True)
Example 2: indexing column in pandas
In [8]: age_sex = titanic[["Age", "Sex"]]
In [9]: age_sex.head()
Out[9]:
Age Sex
0 22.0 male
1 38.0 female
2 26.0 female
3 35.0 female
4 35.0 male