improved the code

practice/ocr-numbers/ocr_numbers.py

@@ -1,9 +1,47 @@
 def process_section(section, digits):
+    """
+    Process a section of the input grid and convert it to a string of digits.
+
+    Args:
+        section (list): A list of strings representing a section of the input grid.
+        digits (dict): A dictionary mapping grid patterns to digits.
+
+    Returns:
+        str: A string of digits representing the section.
+
+    Examples:
+        >>> process_section([" _ ", "| |", "|_|", "   "], digits)
+        '0'
+    """
+    # Create chunks by joining every three characters in each row of the section
     chunks = [''.join(row[i:i+3] for row in section) for i in range(0, len(section[0]), 3)]
+
+    # Convert each chunk to a digit (or '?' if the chunk is not recognized)
     output = [digits.get(chunk, '?') for chunk in chunks]
+
+    # Join the digits into a string and return it
     return ''.join(output)
 
+
 def convert(input_grid):
+    """
+    Convert an OCR number grid to a string of digits.
+
+    Args:
+        input_grid (list): A list of strings representing the OCR number grid.
+
+    Returns:
+        str: A string of digits representing the OCR number grid.
+
+    Raises:
+        ValueError: If the number of input lines is not a multiple of four or
+                    if the number of input columns is not a multiple of three.
+
+    Examples:
+        >>> convert([" _ ", "| |", "|_|", "   ", "    ", "  |", "  |", "   "])
+        '0,1'
+    """
+    # Define the mapping from grid patterns to digits
     digits = {
         " _ | ||_|   ": "0",
         "     |  |   ": "1",
@@ -17,10 +55,16 @@ def convert(input_grid):
         " _ |_| _|   ": "9",
     }
 
+    # Check if the number of input lines is a multiple of four
     if len(input_grid) % 4 != 0:
         raise ValueError("Number of input lines is not a multiple of four")
+
+    # Check if the number of input columns is a multiple of three
     if any(len(row) % 3 != 0 for row in input_grid):
         raise ValueError("Number of input columns is not a multiple of three")
 
+    # Split the input grid into sections
     sections = [input_grid[i:i+4] for i in range(0, len(input_grid), 4)]
+
+    # Process each section and join the results with commas
     return ','.join(process_section(section, digits) for section in sections)