Getting the right index

Here's a DataFrame named matches containing potential matches between two DataFrames, users_1 and users_2. Each DataFrame's row indices is stored in uid_1 and uid_2 respectively.

             first_name  address_1  address_2  marriage_status  date_of_birth
uid_1 uid_2                                                                  
0     3              1          1          1                1              0
     ...            ...         ...        ...              ...            ...
     ...            ...         ...        ...              ...            ...
1     3              1          1          1                1              0
     ...            ...         ...        ...              ...            ...
     ...            ...         ...        ...              ...            ...

How do you extract all values of the uid_1 index column?

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