我正在尝试使用命令！pip install psutil安装lib psutil . 当我运行此代码时，我得到了这个

Requirement already satisfied: psutil in /opt/conda/lib/python3.6/site-packages (5.4.8)

之后，我尝试运行此代码：

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')

它的工作原理！但是在代码结束时，当我尝试保存图片时，我收到了这个错误：

ValueError: Image generation requires the psutil package.

Install using pip:
    $ pip install psutil

Install using conda:
    $ conda install psutil

我该怎么做才能安装lib psutil？

我也尝试使用conda install psutil安装并获得：

==> WARNING: A newer version of conda exists. <==                                                                                                                                                                                                                                                                          
  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.

但如果我使用conda update -n base conda，什么都不会发生！

python pip conda psutil