Given the following dataframe, df, drop all the rows where the contract_sign_date is between 2018-09-01 and 2018-10-13 (inclusive):
df:
| vendor_id | name | contract_sign_date | total_spend |
|---|---|---|---|
| 1 | vendor_schmendor | 2018-09-01 | 34324 |
| 2 | parts_r_us | 2018-09-03 | 23455 |
| 3 | vendor_king | 2018-10-11 | 77654 |
| 4 | vendor_diagram | 2018-08-21 | 23334 |
| 5 | venny | 2018-08-13 | 94843 |
| 6 | vendtriloquist | 2018-10-29 | 23444 |
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