tensorflow由于未初始化变量而导致的错误

我写的这个程序

import tensorflow as tf

sess=tf.InteractiveSession()
x=tf.Variable([1.0,2.0])
a=tf.constant([3.0,3.0])
x.initializer.run()
sun=tf.div(x,a)
print(sub.eval())

sess.close()

出现了如下所示的错误：

原因是倒数第二行的sub没有初始化，倒数第三行应该是初始化sub的，但是打错了，成了sun,这样后面出现的sub就相当于没有初始化，所以出现了变量没有初始化的错误。

FailedPreconditionError                   Traceback (most recent call last)
C:UsersSKJAnaconda3libsite-packages	ensorflowpythonclientsession.py in _do_call(self, fn, *args)
   1360     try:
-> 1361       return fn(*args)
   1362     except errors.OpError as e:

C:UsersSKJAnaconda3libsite-packages	ensorflowpythonclientsession.py in _run_fn(session, feed_dict, fetch_list, target_list, options, run_metadata)
   1339           return tf_session.TF_Run(session, options, feed_dict, fetch_list,
-> 1340                                    target_list, status, run_metadata)
   1341 

C:UsersSKJAnaconda3libsite-packages	ensorflowpythonframeworkerrors_impl.py in __exit__(self, type_arg, value_arg, traceback_arg)
    515             compat.as_text(c_api.TF_Message(self.status.status)),
--> 516             c_api.TF_GetCode(self.status.status))
    517     # Delete the underlying status object from memory otherwise it stays alive

FailedPreconditionError: Attempting to use uninitialized value Variable_1
	 [[Node: Variable_1/read = Identity[T=DT_FLOAT, _class=["loc:@Variable_1"], _device="/job:localhost/replica:0/task:0/device:CPU:0"](Variable_1)]]

During handling of the above exception, another exception occurred:

FailedPreconditionError                   Traceback (most recent call last)
<ipython-input-3-cac34f40642f> in <module>()
      5 x.initializer.run()
      6 sun=tf.div(x,a)
----> 7 print(sub.eval())
      8 sess.close()

C:UsersSKJAnaconda3libsite-packages	ensorflowpythonframeworkops.py in eval(self, feed_dict, session)
    654 
    655     """
--> 656     return _eval_using_default_session(self, feed_dict, self.graph, session)
    657 
    658 

C:UsersSKJAnaconda3libsite-packages	ensorflowpythonframeworkops.py in _eval_using_default_session(tensors, feed_dict, graph, session)
   4899                        "the tensor"s graph is different from the session"s "
   4900                        "graph.")
-> 4901   return session.run(tensors, feed_dict)
   4902 
   4903 

C:UsersSKJAnaconda3libsite-packages	ensorflowpythonclientsession.py in run(self, fetches, feed_dict, options, run_metadata)
    903     try:
    904       result = self._run(None, fetches, feed_dict, options_ptr,
--> 905                          run_metadata_ptr)
    906       if run_metadata:
    907         proto_data = tf_session.TF_GetBuffer(run_metadata_ptr)

C:UsersSKJAnaconda3libsite-packages	ensorflowpythonclientsession.py in _run(self, handle, fetches, feed_dict, options, run_metadata)
   1135     if final_fetches or final_targets or (handle and feed_dict_tensor):
   1136       results = self._do_run(handle, final_targets, final_fetches,
-> 1137                              feed_dict_tensor, options, run_metadata)
   1138     else:
   1139       results = []

C:UsersSKJAnaconda3libsite-packages	ensorflowpythonclientsession.py in _do_run(self, handle, target_list, fetch_list, feed_dict, options, run_metadata)
   1353     if handle is None:
   1354       return self._do_call(_run_fn, self._session, feeds, fetches, targets,
-> 1355                            options, run_metadata)
   1356     else:
   1357       return self._do_call(_prun_fn, self._session, handle, feeds, fetches)

C:UsersSKJAnaconda3libsite-packages	ensorflowpythonclientsession.py in _do_call(self, fn, *args)
   1372         except KeyError:
   1373           pass
-> 1374       raise type(e)(node_def, op, message)
   1375 
   1376   def _extend_graph(self):

FailedPreconditionError: Attempting to use uninitialized value Variable_1
	 [[Node: Variable_1/read = Identity[T=DT_FLOAT, _class=["loc:@Variable_1"], _device="/job:localhost/replica:0/task:0/device:CPU:0"](Variable_1)]]

Caused by op "Variable_1/read", defined at:
  File "C:UsersSKJAnaconda3lib
unpy.py", line 184, in _run_module_as_main
    "__main__", mod_spec)
  File "C:UsersSKJAnaconda3lib
unpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:UsersSKJAnaconda3libsite-packagesipykernel\__main__.py", line 3, in <module>
    app.launch_new_instance()
  File "C:UsersSKJAnaconda3libsite-packages	raitletsconfigapplication.py", line 653, in launch_instance
    app.start()
  File "C:UsersSKJAnaconda3libsite-packagesipykernelkernelapp.py", line 474, in start
    ioloop.IOLoop.instance().start()
  File "C:UsersSKJAnaconda3libsite-packageszmqeventloopioloop.py", line 162, in start
    super(ZMQIOLoop, self).start()
  File "C:UsersSKJAnaconda3libsite-packages	ornadoioloop.py", line 887, in start
    handler_func(fd_obj, events)
  File "C:UsersSKJAnaconda3libsite-packages	ornadostack_context.py", line 275, in null_wrapper
    return fn(*args, **kwargs)
  File "C:UsersSKJAnaconda3libsite-packageszmqeventloopzmqstream.py", line 440, in _handle_events
    self._handle_recv()
  File "C:UsersSKJAnaconda3libsite-packageszmqeventloopzmqstream.py", line 472, in _handle_recv
    self._run_callback(callback, msg)
  File "C:UsersSKJAnaconda3libsite-packageszmqeventloopzmqstream.py", line 414, in _run_callback
    callback(*args, **kwargs)
  File "C:UsersSKJAnaconda3libsite-packages	ornadostack_context.py", line 275, in null_wrapper
    return fn(*args, **kwargs)
  File "C:UsersSKJAnaconda3libsite-packagesipykernelkernelbase.py", line 276, in dispatcher
    return self.dispatch_shell(stream, msg)
  File "C:UsersSKJAnaconda3libsite-packagesipykernelkernelbase.py", line 228, in dispatch_shell
    handler(stream, idents, msg)
  File "C:UsersSKJAnaconda3libsite-packagesipykernelkernelbase.py", line 390, in execute_request
    user_expressions, allow_stdin)
  File "C:UsersSKJAnaconda3libsite-packagesipykernelipkernel.py", line 196, in do_execute
    res = shell.run_cell(code, store_history=store_history, silent=silent)
  File "C:UsersSKJAnaconda3libsite-packagesipykernelzmqshell.py", line 501, in run_cell
    return super(ZMQInteractiveShell, self).run_cell(*args, **kwargs)
  File "C:UsersSKJAnaconda3libsite-packagesIPythoncoreinteractiveshell.py", line 2717, in run_cell
    interactivity=interactivity, compiler=compiler, result=result)
  File "C:UsersSKJAnaconda3libsite-packagesIPythoncoreinteractiveshell.py", line 2821, in run_ast_nodes
    if self.run_code(code, result):
  File "C:UsersSKJAnaconda3libsite-packagesIPythoncoreinteractiveshell.py", line 2881, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-2-69a776ba1e33>", line 3, in <module>
    x=tf.Variable([1.0,2.0])
  File "C:UsersSKJAnaconda3libsite-packages	ensorflowpythonopsvariables.py", line 233, in __init__
    constraint=constraint)
  File "C:UsersSKJAnaconda3libsite-packages	ensorflowpythonopsvariables.py", line 381, in _init_from_args
    self._snapshot = array_ops.identity(self._variable, name="read")
  File "C:UsersSKJAnaconda3libsite-packages	ensorflowpythonopsarray_ops.py", line 131, in identity
    return gen_array_ops.identity(input, name=name)
  File "C:UsersSKJAnaconda3libsite-packages	ensorflowpythonopsgen_array_ops.py", line 2656, in identity
    "Identity", input=input, name=name)
  File "C:UsersSKJAnaconda3libsite-packages	ensorflowpythonframeworkop_def_library.py", line 787, in _apply_op_helper
    op_def=op_def)
  File "C:UsersSKJAnaconda3libsite-packages	ensorflowpythonframeworkops.py", line 3271, in create_op
    op_def=op_def)
  File "C:UsersSKJAnaconda3libsite-packages	ensorflowpythonframeworkops.py", line 1650, in __init__
    self._traceback = self._graph._extract_stack()  # pylint: disable=protected-access

FailedPreconditionError (see above for traceback): Attempting to use uninitialized value Variable_1
	 [[Node: Variable_1/read = Identity[T=DT_FLOAT, _class=["loc:@Variable_1"], _device="/job:localhost/replica:0/task:0/device:CPU:0"](Variable_1)]]