formloader - GitPress.io

Example Python program formloader.py

Modules

Installs a python importlib PathFinder that assists with compiling and loading
import importlib
import io
import logging
import sys
from PyQt5 import QtCore, uic
class FormLoader(importlib.machinery.SourceFileLoader):
class FormFileFinder(importlib.machinery.FileFinder):
class FormFinder(importlib.machinery.PathFinder):

Classes

class FormLoader(importlib.machinery.SourceFileLoader):
class FormFileFinder(importlib.machinery.FileFinder):
class FormFinder(importlib.machinery.PathFinder):

Methods

def get_data(self, path):
def init(self, path):
def find_spec(cls, fullname, path=None, target=None):
def install():

Code

Example Python PyQt program :

"""
Installs a python importlib PathFinder that assists with compiling and loading
PyQt5 .ui files as python modules.
"""
import importlib
import io
import logging
import sys

from PyQt5 import QtCore, uic


logger = logging.getLogger(__name__)


class FormLoader(importlib.machinery.SourceFileLoader):

    def get_data(self, path):
        """Return the data from path as raw bytes."""
        if path.endswith('.ui'):
            buf = io.StringIO()
            with buf, open(path, 'rb') as uifile:
                uic.compileUi(uifile, buf)
                return buf.getvalue().encode('utf-8')
        else:
            return super().get_data(path)


class FormFileFinder(importlib.machinery.FileFinder):

    def __init__(self, path):
        super().__init__(path, (FormLoader, ('.ui',)))


class FormFinder(importlib.machinery.PathFinder):

    @classmethod
    def find_spec(cls, fullname, path=None, target=None):
        if path:
            finder = FormFileFinder(path[0])
            spec = finder.find_spec(fullname, target=target)
            if spec is not None:
                return spec


def install():
    sys.meta_path.insert(0, FormFinder)

Useful Links

Articles: https://python-commandments.org/
PyQt: https://pythonpyqt.com/
Tutorial: https://pythonprogramminglanguage.com/