sample_dict = { 'Physics': 82,  'Math': 65,  'history': 75}
min_value = min(sample_dict.keys())
print(min_value)

Math

sample_dict = {'a': 100, 'b': 200, 'c': 300}

some_value = 200

if some_value in sample_dict.values():
    print('200 is present in a dict ')
else:
    print("200 is not present in a dict")

 

200 is present in a dict 

dict1 = {'Ten': 10, 'Twenty': 20, 'Thirty': 30}
dict2 = {'Thirty': 30, 'Fourty': 40, 'Fifty': 50}

dict1.update(dict2)
print(dict1)

{'Ten': 10, 'Twenty': 20, 'Thirty': 30, 'Fourty': 40, 'Fifty': 50}