CSV files

import csv

rows = [
    ["Tom", 25],
    ["Anna", 30]
]

with open("people.csv", "w", newline="") as file:
    writer = csv.writer(file)
    writer.writerow(["Name", "Age"]) # writing a header row
    writer.writerows(rows) # writing multiple rows

# Displaying each row
with open("people.csv", "r") as file:
    reader = csv.reader(file)
    for row in reader:
        print(row)
                                    

JSON files

import json

person = {"name": "Tom", "age": 25}

jsonString = json.dumps(person) # converting a dictionary to a JSON string
print(jsonString)

data = json.loads('{"name": "Tom", "age": 25}') # converting a JSON string to a dictionary
print(data["name"])

numbers = json.loads('[1, 2, 3, 4]') # converting a JSON string to a list
print(numbers)

with open("data.json", "w") as file:
    json.dump(person, file) # saving a dictionary to a JSON file

with open("data.json", "r") as file:
    data = json.load(file) # reading a dictionary from a JSON file

print(data)