Python 3.13.6 (tags/v3.13.6:4e66535, Aug  6 2025, 14:36:00) [MSC v.1944 64 bit (AMD64)] on win32
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person_1 = {
    "name": "Jane", 
    "dob": "12/08/1997", 
    "city": "Houston"
}

person_1.get('name', 'some stranger')
'Jane'
person_2 = {
    "fname": "Jane", 
    "dob": "12/08/1997", 
    "city": "Houston"
}
person_2
{'fname': 'Jane', 'dob': '12/08/1997', 'city': 'Houston'}
person_2.get('name', 'some stranger')
'some stranger'
person_2['name']
Traceback (most recent call last):
  File "<pyshell#5>", line 1, in <module>
    person_2['name']
KeyError: 'name'
person_3 = {
    "fname": "Joseph", 
    "dob": "12/07/2011", 
    "city": "Dallas"
}
person_1
{'name': 'Jane', 'dob': '12/08/1997', 'city': 'Houston'}
person_3
{'fname': 'Joseph', 'dob': '12/07/2011', 'city': 'Dallas'}
person_1.update(person_3)
person_3
{'fname': 'Joseph', 'dob': '12/07/2011', 'city': 'Dallas'}
person_1
{'name': 'Jane', 'dob': '12/07/2011', 'city': 'Dallas', 'fname': 'Joseph'}
d1 = {'a': 12, 'b':20}
d1
{'a': 12, 'b': 20}
k = d1.keys()
k
dict_keys(['a', 'b'])
for item in k:
	print(item)

	
a
b
d1['c'] = 'hello'
d1
{'a': 12, 'b': 20, 'c': 'hello'}
for item in k:
	print(item)

	
a
b
c
da = {'a': 2, 'the': 4} # count the occurences of word.
da
{'a': 2, 'the': 4}
da['hello'} = 3
SyntaxError: closing parenthesis '}' does not match opening parenthesis '['
da['hello'] = 3
da
{'a': 2, 'the': 4, 'hello': 3}
da['hello'] += 1  # da['hello'] = da['hello'] + 1
da
{'a': 2, 'the': 4, 'hello': 4}
db = {'bird': 2, 'monkey':4}
db
{'bird': 2, 'monkey': 4}
da.update(db)
da
{'a': 2, 'the': 4, 'hello': 4, 'bird': 2, 'monkey': 4}
da.update({'monkey': 25, 'tiger': 7})
da
{'a': 2, 'the': 4, 'hello': 4, 'bird': 2, 'monkey': 25, 'tiger': 7}
dc = {'a': 10, 'e': 'hey;}
      
SyntaxError: unterminated string literal (detected at line 1)
dc = {'a': 10, 'e': 'hey'}
      
dc
      
{'a': 10, 'e': 'hey'}
len(dc.keys())
      
2
dc['f'] = [1,3,5,6]
      
dc
      
{'a': 10, 'e': 'hey', 'f': [1, 3, 5, 6]}
len(dc.keys())
      
3
dc['f'] = "I like a string now.'
dc
      

dc['f'] = "I like a string now."
      
dc
      
{'a': 10, 'e': 'hey', 'f': 'I like a string now.'}
len(dc.keys())
      
3
dc['f'] = {'s1': [1,3,5,6], 100: {'x': 1, 'y':2}}
      
dc
      
{'a': 10, 'e': 'hey', 'f': {'s1': [1, 3, 5, 6], 100: {'x': 1, 'y': 2}}}
len(dc.keys())
      
3
dc['f']
      
{'s1': [1, 3, 5, 6], 100: {'x': 1, 'y': 2}}
dc['f']['s1']
      
[1, 3, 5, 6]
dc['f']['s1'][1]
      
3
dc['f']
...       
{'s1': [1, 3, 5, 6], 100: {'x': 1, 'y': 2}}
>>> dc['f'][100]
...       
{'x': 1, 'y': 2}
>>> dc['f'][100]['y']
...       
2
>>> dc['f']['s1'][1:4]
...       
[3, 5, 6]
>>> dc
...       
{'a': 10, 'e': 'hey', 'f': {'s1': [1, 3, 5, 6], 100: {'x': 1, 'y': 2}}}
>>> my_set = {1, 2, 3, 4, 4, 5}
...       
>>> my_set
...       
{1, 2, 3, 4, 5}
>>> my_list = [1,2,3,2,3,,1]
...       
SyntaxError: invalid syntax
>>> my_list = [1,2,3,2,3,1]
...       
>>> my_list
...       
[1, 2, 3, 2, 3, 1]