Can you tell about the most popular built-in modules in Python that are frequently used in projects?

Python has a multitude of built-in modules that are frequently used in projects:

• os — for working with the operating system: managing files, directories, environment variables.
• sys — interacting with the Python interpreter, command-line arguments.
• json — for serializing and deserializing data in JSON format.
• datetime — working with dates and times.
• re — regular expressions for searching and processing text.
• logging — organizing logging in applications.
• collections — advanced data structures, such as defaultdict, namedtuple.

Example of using the json module:

import json

data = {'name': 'Ivan', 'age': 30}
json_str = json.dumps(data, ensure_ascii=False)
print(json_str)  # Outputs: {"name": "Ivan", "age": 30}