how to index a column in pandas code example

Example 1: define a column as index pandas

myDataFrame.set_index('column_name')

Example 2: pandas df by row index

indices = [133, 22, 19, 203, 14, 1]
df_by_indices = df.iloc[indices, :]

Example 3: 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

Example 4: indexing column in pandas

In [10]: type(titanic[["Age", "Sex"]])
Out[10]: pandas.core.frame.DataFrame