title: No module named 'testCases_v4'
body: <p>I made a direct copy from the coursera`s code But it turns out like this<a href="https://i.stack.imgur.com/6Pfyb.png" rel="nofollow noreferrer">enter image description here</a></p>
  
  <p>What should I do?</p>
  
  <pre><code>import numpy as np
  import h5py
  import matplotlib.pyplot as plt
  from testCases_v4 import *
  from dnn_utils_v2 import sigmoid, sigmoid_backward, relu, relu_backward
  
  %matplotlib inline
  plt.rcParams['figure.figsize'] = (5.0, 4.0) # set default size of plots
  plt.rcParams['image.interpolation'] = 'nearest'
  plt.rcParams['image.cmap'] = 'gray'
  
  %load_ext autoreload
  %autoreload 2
  
  np.random.seed(1)
  </code></pre>
  
  <h1>that`s what I get</h1>
  
  <pre><code>ModuleNotFoundError                       Traceback (most recent call last)
  &lt;ipython-input-4-5084fe490343&gt; in &lt;module&gt;()
    2 import h5py
    3 import matplotlib.pyplot as plt
  ----&gt; 4 from testCases_v4 import *
    5 from dnn_utils_v2 import sigmoid, sigmoid_backward, relu, relu_backward
    6 
  
  ModuleNotFoundError: No module named 'testCases_v4'
  </code></pre>