code: def srepr(expr, indented=False, cache=None):
      
      if indented:
          printer = IndentedSReprPrinter(cache=cache)
      else:
          printer = QnetSReprPrinter(cache=cache)
      return printer.doprint(expr)
docs: Render the given expression into a string that can be evaluated in an
      appropriate context to re-instantiate an identical expression. If
      `indented` is False (default), the resulting string is a single line.
      Otherwise, the result is a multiline string, and each positional and
      keyword argument of each `Expression` is on a separate line, recursively
      indented to produce a tree-like output. The `cache` may be used to generate
      more readable expressions.
  
      Example:
  
          >>> hs = LocalSpace('1')
          >>> A = OperatorSymbol('A', hs=hs); B = OperatorSymbol('B', hs=hs)
          >>> expr = A + B
          >>> srepr(expr)
          "OperatorPlus(OperatorSymbol('A', hs=LocalSpace('1')), OperatorSymbol('B', hs=LocalSpace('1')))"
          >>> eval(srepr(expr)) == expr
          True
          >>> srepr(expr, cache={hs:'hs'})
          "OperatorPlus(OperatorSymbol('A', hs=hs), OperatorSymbol('B', hs=hs))"
          >>> eval(srepr(expr, cache={hs:'hs'})) == expr
          True
          >>> print(srepr(expr, indented=True))
          OperatorPlus(
              OperatorSymbol(
                  'A',
                  hs=LocalSpace(
                      '1')),
              OperatorSymbol(
                  'B',
                  hs=LocalSpace(
                      '1')))
          >>> eval(srepr(expr, indented=True)) == expr
          True
  
      See also:
          :func:`~qnet.printing.tree.print_tree`, respectively
          :func:`qnet.printing.tree.tree`, produces an output similar to
          the indented :func:`srepr`, for interactive use. Their result
          cannot be evaluated and the exact output depends on
          :func:`init_printing`.
  
          :func:`~qnet.printing.dot.dotprint` provides a way to graphically
          explore the tree structure of an expression.