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in ⁄ not in

if <object> in <sequence>:
       <if body>
if <object> not in <sequence>:
       <if body>

Checks for membership of object within a sequence.

Operators:
in :
Checks if object is a member of a sequence
not in :
Checks if object is not a member of a sequence
Returns:
True or False.
Return Type:
Boolean
id_ser = pets.get('ID')
id_ser
  • 0"dog_001"
  • 1"cat_001"
  • 2"cat_002"
  • 3"dog_002"
  • 4"dog_003"
  • 5"ham_001"
  • 6"ham_002"
  • 7"cat_003"
Name: ID, dtype: object
def cat_and_dog_info(pet_id):
    id_arr = np.array(pets.get('ID'))
    if pet_id not in id_arr:
        return 'This pet is not in our record'
cat_and_dog_info('cat_009')

'This pet is not in our record'