title: Why do I receive an error when running Python code in cmd prmpt using Tensorflow?
body: <p>How can Tensorflow have no "div" attribute? When I try to run a python  program from the command prompt (from tensorflow for dummies page 23 (simple program) I receive this error:</p>
  
  <pre><code>C:\Users\ME\TENSORFLOW\ch3&gt;python simple_math.py
  2020-04-26 13:50:29.871436: W tensorflow/stream_executor/platform/default/dso_loader.cc:55] Could not load dynamic library 'cudart64_101.dll'; dlerror: cudart64_101.dll not found
  2020-04-26 13:50:29.880652: I tensorflow/stream_executor/cuda/cudart_stub.cc:29] Ignore above cudart dlerror if you do not have a GPU set up on your machine.
  2020-04-26 13:50:32.204590: W tensorflow/stream_executor/platform/default/dso_loader.cc:55] Could not load dynamic library 'nvcuda.dll'; dlerror: nvcuda.dll not found
  2020-04-26 13:50:32.212936: E tensorflow/stream_executor/cuda/cuda_driver.cc:351] failed call to cuInit: UNKNOWN ERROR (303)
  2020-04-26 13:50:32.228615: I tensorflow/stream_executor/cuda/cuda_diagnostics.cc:169] retrieving CUDA diagnostic information for host: DESKTOP-C7DH370
  2020-04-26 13:50:32.236344: I tensorflow/stream_executor/cuda/cuda_diagnostics.cc:176] hostname: DESKTOP-C7DH370
  Traceback (most recent call last):
    File "simple_math.py", line 13, in &lt;module&gt;
      quot = tf.div(const_a, const_b)
  AttributeError: module 'tensorflow' has no attribute 'div'
  </code></pre>
  
  <p>Did I install a wrong version of python? I installed python 3.7. Or perhaps I did not install tensorflow correctly. The book tensorflow for dummies was published in 2018. Maybe it was intended for another version of python? and/or another version of tensorflow? thank you so much in advance</p>
  
  <p>Here is the code of the "simple.math.py" :</p>
  
  <pre><code>''' Perform simple math operations with TensorFlow '''
  
      from __future__ import absolute_import
      from __future__ import division
      from __future__ import print_function
  
      import tensorflow as tf
  
      # Math with constant tensors
      const_a = tf.constant(3.6)
      const_b = tf.constant(1.2)
      total = const_a + const_b
      quot = tf.div(const_a, const_b)
  
      # Math with random tensors
      rand_a = tf.random_normal([3], 2.0)
      rand_b = tf.random_uniform([3], 1.0, 4.0)
      diff = tf.subtract(rand_a, rand_b)
  
      # Vector multiplication
      vec_a = tf.linspace(0.0, 3.0, 4)
      vec_b = tf.fill([4, 1], 2.0)
      prod = tf.multiply(vec_a, vec_b)
      dot = tf.tensordot(vec_a, vec_b, 1)
  
      # Matrix multiplication
      mat_a = tf.constant([[2, 3], [1, 2], [4, 5]])
      mat_b = tf.constant([[6, 4, 1], [3, 7, 2]])
      mat_prod = tf.matmul(mat_a, mat_b)
  
     # Execute the operations
        with tf.Session() as sess:
          print('Sum: %f' % sess.run(total))
          print('Quotient: %f' % sess.run(quot))
          print('Difference: ', sess.run(diff))
          print('Element-wise product: ', sess.run(prod))
          print('Dot product: ', sess.run(dot))
          print('Matrix product: ', sess.run(mat_prod))
  
  
     thank you
  
  
  
  After running the following program on windows with latest tensorflow 
  installed, I receive the message underneath the python code below:
  
  ''' A simple TensorFlow application '''
  
  from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  
  import tensorflow as tf
  
  # Create tensor
  msg = tf.strings.join(['Hello ', 'TensorFlow!'])
  
  # Launch session
  with tf.Session() as sess:
      print(sess.run(msg))
  
  
  
  (venv) C:\Users\ME\TENSORFLOW\ch2&gt;python hello_tensorflow.py
  2020-04-29 00:28:30.676246: W 
  
  tensorflow/stream_executor/platform/default/dso_loader.cc:55] Could not load 
  dynamic library 'cudart64_101.dll'; dlerror: cudart64_101.dll not found
      2020-04-29 00:28:30.684568: I 
  tensorflow/stream_executor/cuda/cudart_stub.cc:29] Ignore above cudart 
  dlerror 
  if you do not have a GPU set up on your machine.
      2020-04-29 00:28:32.573201: W 
  tensorflow/stream_executor/platform/default/dso_loader.cc:55] Could not 
  load dynamic library 'nvcuda.dll'; dlerror: nvcuda.dll not found
      2020-04-29 00:28:32.580400: E 
  tensorflow/stream_executor/cuda/cuda_driver.cc:313] failed call to cuInit: 
  UNKNOWN ERROR (303)
      2020-04-29 00:28:32.591791: I 
  tensorflow/stream_executor/cuda/cuda_diagnostics.cc:169] retrieving CUDA 
  diagnostic information for host: DESKTOP-C7DH370
      2020-04-29 00:28:32.599756: I 
  tensorflow/stream_executor/cuda/cuda_diagnostics.cc:176] hostname: 
  DESKTOP- 
  C7DH370
      2020-04-29 00:28:32.615405: I 
  tensorflow/compiler/xla/service/service.cc:168] XLA service 0x1e0678689e0 
  initialized for platform Host (this does not guarantee that XLA will be 
  used). 
  Devices:
      2020-04-29 00:28:32.623598: I 
  tensorflow/compiler/xla/service/service.cc:176]   StreamExecutor device 
  (0): 
  Host, Default Version
      Traceback (most recent call last):
        File "hello_tensorflow.py", line 13, in &lt;module&gt;
          with tf.Session() as sess:
      AttributeError: module 'tensorflow' has no attribute 'Session'
  </code></pre>