parameters: (el, prefix)
return_statement: return el
docstring: Strips prefix at the left of el
docstring_summary: Strips prefix at the left of el
docstring_tokens: Strips prefix at the left of el
function: def left_strip(el, prefix):
      """
      Strips prefix at the left of el
      """
      if el.startswith(prefix):
          return el[len(prefix):]
      return el
function_tokens: def left_strip ( el , prefix ) : if el . startswith ( prefix ) : return el [ len ( prefix ) : ] return el