How to convert pandas dataframe max index values into string?

I am working with a pandas dataframe consisting of "recipients" on the y axis and "donors" on the x.

            Donor1  Donor2  Donor3  Donor4  Donor5  Donor6
Recipient1       0       4       1       4       7       6
Recipient2       6       0       9       8       5       8
Recipient3       5       3       5       0       9       3
Recipient4       9       2       1       8       0       5
Recipient5       4       5       5       9       4       2
Recipient6       5       4       2       8       5       6

The maxValueIndex code

maxValueIndex = df_test_bid.idxmax(axis = 1)
print(str(maxValueIndex))

produces: (index of max value in that row)

Recipient1    Donor5
Recipient2    Donor3
Recipient3    Donor5
Recipient4    Donor1
Recipient5    Donor4
Recipient6    Donor4
dtype: object

How can I convert each recipient/donor pair into a single string? In other words, how can I iterate through each recipient/donor pair?

Trying to iterate with a for loop only gets me the donors.

source https://stackoverflow.com/questions/71991781/how-to-convert-pandas-dataframe-max-index-values-into-string

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