Python JSON Expressions

import json

# some JSON:
x =  '{ "name":"John", "age":30, "city":"New York"}'

# parse x:
y = json.loads(x)

# the result is a Python dictionary (object):
print(y["age"])


# a Python dictionary (object):
x = {
  "name": "John",
  "age": 30,
  "city": "New York"
}

# convert into JSON:
y = json.dumps(x)

# the result is a JSON string:
print(y)


# Loop + JSON:
customersJSON = """
[
    { "name":"Alice", "age":20, "city":"London"},
    { "name":"Eve", "age":22, "city":"Berlin"},
    { "name":"Aria", "age":33, "city":"Vienna"},
    { "name":"Frank", "age":27, "city":"Madrid"},
    { "name":"Grace", "age":32, "city":"Rome"},
    { "name":"Henry", "age":29, "city":"Amsterdam"},
    { "name":"Isabella", "age":24, "city":"Vienna"}
]
"""

customers = json.loads(customersJSON)

totalAge = 0
nrOfPersons = 0

for customer in customers:
    totalAge += customer['age']
    nrOfPersons += 1

avgAge = totalAge / nrOfPersons

print(F'The average age of all {nrOfPersons} customers is: {avgAge}')