Initial commit

training/demos/10-graphical-ui/data-conversion-demo/source/loaders/__init__.py

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+from .csvmanager import CSVManager  # Imports in the package so it can be imported from the package too

training/demos/10-graphical-ui/data-conversion-demo/source/loaders/basemanager.py

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+from abc import ABC, abstractmethod
+from loaders.formats import DataFormat
+
+
+class BaseDataManager(ABC):
+    """Base class for data managers."""
+
+    @abstractmethod
+    def load(self, url: str, encoding: str = "iso8859-1"):
+        """Load data for the manager."""
+        pass
+
+    @abstractmethod
+    def export(self, url: str, fmt: DataFormat):
+        """Export data in a specific format."""
+        pass

training/demos/10-graphical-ui/data-conversion-demo/source/loaders/csvmanager.py

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+import csv
+
+from loaders.basemanager import BaseDataManager
+from loaders.formats import DataFormat
+
+
+class CSVManager(BaseDataManager):
+    """
+    Utility class to keep CSV data for export in other formats.
+
+    Attributes:
+        data: Contains loaded file data as a list of lists.
+
+    """
+
+    data: list = None
+
+    def __init__(self, url: str):
+        """
+        Initialize the object with a URL.
+
+        Args:
+            url: CSV URL to load from.
+
+        """
+        self.load(url)
+
+    def load(self, url: str, encoding: str = "iso8859-1"):
+        """
+        Load a CSV given its file path.
+
+        Args:
+            url: Path of the CSV file.
+            encoding: Codepage name of the text file.
+
+        """
+        with open(url, "r", encoding=encoding) as f:
+            reader = csv.reader(f, delimiter=",")
+            if self.data is None:
+                self.data = []
+            for row in reader:
+                self.data.append(row)
+
+    def export(self, url: str, fmt: DataFormat):
+        """Official method to export data."""
+        if fmt is DataFormat.TEXT:
+            self.export_text(url)
+        elif fmt is DataFormat.CSV:
+            self.export_csv(url)
+        else:
+            raise ValueError(f"{fmt}: unsupported format.")
+
+    def export_text(self, url: str):
+        """
+        Save data as a text file.
+
+        Every column is save in its own line as an example.
+
+        Args:
+            url: Output file path.
+
+        """
+        with open(url, "w", encoding="utf-8") as file:
+            for row in self.data:
+                file.write("\n".join(row))
+
+    def export_csv(self, url: str):
+        """
+        Save data as a CSV file with semicolons.
+
+        Args:
+            url: Output file path.
+
+        """
+        with open(url, "w", encoding="utf-8") as file:
+            writer = csv.writer(file, delimiter=";")
+            for row in self.data:
+                writer.writerow(row)

training/demos/10-graphical-ui/data-conversion-demo/source/loaders/formats.py

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+from enum import IntEnum
+
+
+class DataFormat(IntEnum):
+    """Supported formats enumeration."""
+    CSV = 0
+    TEXT = 1