In [1]:

    

d = {'key1': 'val1', 'key2': 'val2', 'key3': 'val3'}


    

In [2]:

    

print(d['key1'])


    

    




val1

In [3]:

    

# print(d['key4'])
# KeyError: 'key4'


    

In [4]:

    

d['key4'] = 'val4'
print(d)


    

    




{'key1': 'val1', 'key2': 'val2', 'key3': 'val3', 'key4': 'val4'}

In [5]:

    

print(d.get('key1'))


    

    




val1

In [6]:

    

print(d.get('key5'))


    

    




None

In [7]:

    

print(d.get('key5', 'NO KEY'))


    

    




NO KEY

In [8]:

    

print(d.get('key5', 100))


    

    




100

In [9]:

    

print(d)


    

    




{'key1': 'val1', 'key2': 'val2', 'key3': 'val3', 'key4': 'val4'}