title: is there any alternative to sys.getsizeof() in PyPy?
body: <p>I am trying to run a Python (2.7) script with PyPy but I have encountered the following error:</p>
  
  <pre><code>TypeError: sys.getsizeof() is not implemented on PyPy.
  
  A memory profiler using this function is most likely to give results
  inconsistent with reality on PyPy.  It would be possible to have
  sys.getsizeof() return a number (with enough work), but that may or
  may not represent how much memory the object uses.  It doesn't even
  make really sense to ask how much *one* object uses, in isolation
  with the rest of the system.  For example, instances have maps,
  which are often shared across many instances; in this case the maps
  would probably be ignored by an implementation of sys.getsizeof(),
  but their overhead is important in some cases if they are many
  instances with unique maps.  Conversely, equal strings may share
  their internal string data even if they are different objects---or
  empty containers may share parts of their internals as long as they
  are empty.  Even stranger, some lists create objects as you read
  them; if you try to estimate the size in memory of range(10**6) as
  the sum of all items' size, that operation will by itself create one
  million integer objects that never existed in the first place.
  </code></pre>
  
  <p>Now, I really need to check the size of one nested dict during the execution of the program, is there any alternative to <code>sys.getsizeof()</code> I can use in PyPy? If not, how would I check for the size of a nested object in PyPy?</p>