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P-019: Give ranks to the receipt details data frame (df_receipt) in descending order of sales amount (amount) per item, and extract the first 10 items. Items should display customer ID (customer_id), sales amount (amount), and assigned rank. If the sales amount (amount) is the same, the same ranking shall be given.
code
df_amount_rank = pd.concat([df_receipt[['customer_id', 'amount']] \
,df_receipt['amount'].rank(method='min', ascending=False)], axis=1)
df_amount_rank.columns = ['customer_id', 'amount', 'amount_ranking']
df_amount_rank.sort_values('amount_ranking', ascending=True).head(10)
| customer_id | amount | amount_ranking | |
|---|---|---|---|
| 1202 | CS011415000006 | 10925 | 1 |
| 62317 | ZZ000000000000 | 6800 | 2 |
| 54095 | CS028605000002 | 5780 | 3 |
| 4632 | CS015515000034 | 5480 | 4 |
| 72747 | ZZ000000000000 | 5480 | 4 |
| 10320 | ZZ000000000000 | 5480 | 4 |
| 97294 | CS021515000089 | 5440 | 7 |
| 28304 | ZZ000000000000 | 5440 | 7 |
| 92246 | CS009415000038 | 5280 | 9 |
| 68553 | CS040415000200 | 5280 | 9 |
**-In Pandas DataFrame / Series, create a new rank column, concatenate the columns, and rank the data.
-Use when you want to see numerical information in ranking format.
-'Concat ('
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