学会不用for循环

animals = ["cat", "dog", "rabbit"]
for animal in animals:
    if animal == "cat":
        print("Cat found")
'''
Cat found
'''

---

animals = ["cat", "dog", "rabbit"]
if "cat" in animals:
    print("Cat found")
'''
Cat found
'''    

---

animals = ["cat", "dog", "rabbit"]
cat_found = "cat" in animals
print(cat_found)
'''
True
'''