Questions is regarding cleaning values in columns of pandas Dataframe.

Assuming given the following dataset stored in an Python/dataframe object, write Python code snippets to clean this dataframe object according to the following constraints.

Columns: INVOICE, ZIP, VENDOR, SELLER_STATUS, DATE_MONTH

1) Requirement: INVOICE values can be composed of only characters

2) Requirement: address ZIP values can be composed of only digits

3) Requirement: VENDOR values can be only any of the following values (V_A, V_B, V_C)

4) Requirement: SELLER_STATUS values can be any of the following values (ACTIVE, INACTIVE, SOLD_OUT)

5) Requirement: DATE_MONTH values can be composed of only digits