code: def findLeftBrace(self, block, column):
          
          block, column = self.findBracketBackward(block, column, '{')  # raise ValueError if not found
  
          try:
              block, column = self.tryParenthesisBeforeBrace(block, column)
          except ValueError:
              pass # leave previous values
          return self._blockIndent(block)
docs: Search for a corresponding '{' and return its indentation
          If not found return None