title: Requirement already satisfied with psutil
body: <p>I´m trying to install the lib psutil, using the command !pip install psutil. When I run this code, I got this</p>
  
  <pre><code>Requirement already satisfied: psutil in /opt/conda/lib/python3.6/site-packages (5.4.8)
  </code></pre>
  
  <p>After that, I try to run this code:</p>
  
  <pre><code>from plotly.offline import iplot, init_notebook_mode
  import plotly.graph_objs as go
  import plotly.io as pio
  
  import os
  import numpy as np
  
  init_notebook_mode(connected=True)
  
  N = 100
  x = np.random.rand(N)
  y = np.random.rand(N)
  colors = np.random.rand(N)
  sz = np.random.rand(N)*30
  
  fig = go.Figure()
  fig.add_scatter(x=x,
                  y=y,
                  mode='markers',
                  marker={'size': sz,
                          'color': colors,
                          'opacity': 0.6,
                          'colorscale': 'Viridis'
                         });
  iplot(fig)
  
  pio.write_image(fig, 'fig1.png')
  </code></pre>
  
  <p>And it works! But at the end of the code, when I try to save the picture, I got this error:</p>
  
  <pre><code>ValueError: Image generation requires the psutil package.
  
  Install using pip:
      $ pip install psutil
  
  Install using conda:
      $ conda install psutil
  </code></pre>
  
  <p>What can I do to install the lib psutil? </p>
  
  <p>I also try to install using conda install psutil and got this:</p>
  
  <pre><code>==&gt; WARNING: A newer version of conda exists. &lt;==                                                                                                                                                                                                                                                                          
    current version: 4.5.8                                                                                                                                                                                                                                                                                                   
    latest version: 4.5.11                                                                                                                                                                                                                                                                                                   
  
  Please update conda by running                                                                                                                                                                                                                                                                                             
  
      $ conda update -n base conda                                                                                                                                                                                                                                                                                           
  
  
  
  # All requested packages already installed. 
  </code></pre>
  
  <p>But if I use conda update -n base conda, nothing happend!</p>