restored code

Author: jegesh

randomAccessReader/__init__.py

@@ -0,0 +1,71 @@
+"""
+General random-access file reader with very small memory overhead
+Inspired by: http://stackoverflow.com/a/35785248/1857802
+
+@author: Yaakov Gesher
+"""
+
+# =============
+# imports
+# =============
+
+
+# ==========
+# classes
+# ==========
+
+
+class RandomAccessReader(object):
+
+    def __init__(self, filepath, endline_character='\n'):
+        """
+        :param filepath:  Absolute path to file
+        :param endline_character: Delimiter for lines. Defaults to newline character (\n)
+        """
+        self._filepath = filepath
+        self._endline = endline_character
+        self._lines = self._get_line_data()
+
+    def _get_line_data(self):
+        f = open(self._filepath)
+        lines = []
+        start_position = 0
+        has_more = True
+        current_line = 0
+        while has_more:
+            current = f.read(1)
+            if current == '':
+                has_more = False
+                continue
+
+            if current == self._endline:
+                # we've reached the end of the current line
+                lines.append({"position": start_position, "length": current_line})
+                start_position += current_line + 1
+                current_line = 0
+                continue
+
+            current_line += 1
+        f.close()
+        return lines
+
+    def get_line(self, line_number):
+        """
+        get the contents of a given line in the file
+        :param line_number: 0-indexed line number
+        :return: str
+        """
+        with open(self._filepath) as f:
+            line_data = self._lines[line_number]
+            f.seek(line_data['position'])
+            return f.read(line_data['length'])
+
+
+class CsvRandomAccessReader(RandomAccessReader):
+
+    def __init__(self, filepath, has_header=True, endline_character='\n', values_delimiter=','):
+        super(CsvRandomAccessReader, self).__init__(filepath, endline_character)
+        self.headers = None
+        self._delimiter = values_delimiter
+        if has_header:
+