nano-dev-utils 0.3.3

A collection of small Python utilities for developers.

nano_dev_utils

A collection of small Python utilities for developers.

Modules

timers.py

This module provides a Timer class for measuring the execution time of code blocks and functions.

Timer Class

• __init__(self, precision=4, verbose=False): Initializes a Timer instance.

  • precision (int, optional): The number of decimal places to record and
  • display time durations. Defaults to 4.
  • verbose (bool, optional): If True, the function's arguments and keyword
  • arguments will be included in the printed timing output. Defaults to False.

• timeit(self, func): A decorator that measures the execution time of the decorated function.

  • When the decorated function is called, this decorator records the start and end times,
  • calculates the total execution time, prints the function name and execution time
  • (optionally including arguments if verbose is True), and returns the result of the original function.

Example Usage:

import time
from src.nano_dev_utils.timers import Timer

timer = Timer(precision=6, verbose=True)


@timer.timeit
def my_function(a, b=10):
  """A sample function."""
  time.sleep(0.1)
  return a + b


result = my_function(5, b=20)
print(f"Result: {result}")

dynamic_importer.py

This module provides an Importer class for lazy loading and caching module imports.

Importer Class

• __init__(self): Initializes an Importer instance with an empty dictionary imported_modules to cache imported modules.

• import_mod_from_lib(self, library: str, module_name: str) -> ModuleType | Any: Lazily imports a module from a specified library and caches it.

  • library (str): The name of the library (e.g., "os", "requests").
  • module_name (str): The name of the module to import within the library (e.g., "path", "get").
  • Returns the imported module. If the module has already been imported, it returns the cached instance.
  • Raises ImportError if the module cannot be found.

Example Usage:

from src.nano_dev_utils.dynamic_importer import Importer

importer = Importer()

os_path = importer.import_mod_from_lib("os", "path")
print(f"Imported os.path: {os_path}")

requests_get = importer.import_mod_from_lib("requests", "get")
print(f"Imported requests.get: {requests_get}")

# Subsequent calls will return the cached module
os_path_again = importer.import_mod_from_lib("os", "path")
print(f"Imported os.path again (cached): {os_path_again}")

release_ports.py

This module provides a PortsRelease class to identify and release processes listening on specified TCP ports. It supports Windows, Linux, and macOS.

PortsRelease Class

• __init__(self, default_ports: Optional[list[int]] = None):

• Initializes a PortsRelease instance.

  • default_ports (list[int], optional): A list of default ports to manage.
  • If not provided, it defaults to [6277, 6274].

• get_pid_by_port(port: int) -> Optional[int]: A static method that attempts to

• find the process ID (PID) listening on the given port. It uses platform-specific

• commands (netstat, ss, lsof). Returns the PID if found, otherwise None.

• kill_process(pid: int) -> bool: A static method that attempts to kill the process

• with the given pid. It uses platform-specific commands (taskkill, kill -9).

• Returns True if the process was successfully killed, False otherwise.

• release_all(self, ports: Optional[list[int]] = None) -> None: Releases all processes

• listening on the specified ports.

  • ports (list[int], optional): A list of ports to release. If None, it uses the
  • default_ports defined during initialization.
  • For each port, it first tries to get the PID and then attempts to kill the process.
  • It logs the actions and any errors encountered. Invalid port numbers in the provided list are skipped.

Example Usage:

from src.nano_dev_utils.release_ports import PortsRelease

# Create an instance with default ports
port_releaser = PortsRelease()
port_releaser.release_all()

# Create an instance with custom ports
custom_ports_releaser = PortsRelease(default_ports=[8080, 9000, 6274])
custom_ports_releaser.release_all(ports=[8080, 9000])

# Release only the default ports
port_releaser.release_all()

License

This project is licensed under the MIT License. See LICENSE for details.