#1
importjson
#2
dict_a={}
dict_b={}
#3
dict_a['a1']='b1'
dict_a['a2']='b2'
dict_a['a3']='b3'
#4
ks=dict_a.keys()
print(ks)
print(type(ks))
#5, 6
vs=dict_a.values()
print(vs)
print(dict_a.items())
#7 8
dict_a['a1']='b3'
dict_a['a3']='b1'
print(dict_a)
#9 10
dict_a.pop('a1')
print(dict_a)
#11
dict_b.update(dict_a)
#12 13 14
print(dict_b)
a1=dict_b.get('a1')
print(a1)
#15 16
dict_b['a1']=a1
dict_b['a4']='null'
print(dict_b)
print(type(dict_b))
#17 18
json_c ="""
[
{
"dict_b": {
"a2": "b2",
"a3": "b1",
"a1": None,
"a4": "null"
}
}
]
"""
print(json_c)
print(type(json_c))
#19
json_c=json.dumps(json_c)
dict_c=json.loads(json_c)
print(dict_c)
print(type(dict_c))
