如何在python中检查字典中是否包含整型或字符串？

my_dict = {1: 'apple', 2: 'banana', 3: 'orange'}
key = 2

if key in my_dict:
    print("整型存在于字典中")
else:
    print("整型不存在于字典中")

整型存在于字典中

my_dict = {'apple': 1, 'banana': 2, 'orange': 3}
key = 'apple'

if key in my_dict:
    print("字符串存在于字典中")
else:
    print("字符串不存在于字典中")

字符串存在于字典中