Question

此代码连接到MySQL并获取我使用pandas读取的数据集。一旦数据集在pandas数据帧中，我需要绘制它。但这会引发错误。这是片段

#!/usr/bin/python

import MySQLdb as mdb
import pandas as pd
import matplotlib.pyplot as plt

con = mdb.connect('hostname', 'username', 'password', 'database');

with con:
    cur = con.cursor()
    cur.execute("select month, post, comment, reply, dm, review")
    rows = cur.fetchall()
    df = pd.DataFrame( [[ij for ij in i] for i in rows] )
    df.rename(columns={0: 'Month', 1: 'Post', 2: 'Comment', 3: 'Reply', 4: 'DM', 5: 'Review'}, inplace=True);
    print(df.head(20))

df=df.set_index('Month')
df=df.astype(float)
df.plot(subplots=True)
plt.show()

Traceback (most recent call last):
  File "random-exmaple.py", line 7, in <module>
    plt.plot(x, y, "o")
  File "/usr/local/lib/python2.7/site-packages/matplotlib/pyplot.py", line 3307, in plot
    ax = gca()
  File "/usr/local/lib/python2.7/site-packages/matplotlib/pyplot.py", line 950, in gca
    return gcf().gca(**kwargs)
  File "/usr/local/lib/python2.7/site-packages/matplotlib/pyplot.py", line 586, in gcf
    return figure()
  File "/usr/local/lib/python2.7/site-packages/matplotlib/pyplot.py", line 535, in figure
    **kwargs)
  File "/usr/local/lib/python2.7/site-packages/matplotlib/backends/backend_tkagg.py", line 81, in new_figure_manager
    return new_figure_manager_given_figure(num, figure)
  File "/usr/local/lib/python2.7/site-

packages/matplotlib/backends/backend_tkagg.py", line 89, in new_figure_manager_given_figure
    window = Tk.Tk()
  File "/usr/local/lib/python2.7/lib-tk/Tkinter.py", line 1745, in __init__
    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: no display name and no $DISPLAY environment variable

如何解决这个问题？

抱歉重复 - Issue with tkinter, python and seaborn: _tkinter.TclError: no display name and no $DISPLAY environment variable

Answer 1

当我们尝试在未连接显示设备的远程计算机上运行GUI应用程序或绘制内容时，会出现此类错误。在这种情况下，您可以将图表保存在远程计算机上，并通过scp将它们复制到本地计算机上。你可以这样做：

保存地块：

ax = df.plot(subplots=True)
fig = ax.get_figure()
fig.savefig('plots_name.png')

将图像从远程计算机复制到本地目录：

scp {remote_username}@{remote_host}:{path_to_image}  {path_to_local_directory}

其中{remote_host}是您尝试连接的IP地址或域名，{remote_user}是您在远程计算机上的用户名，{path_to_image}是远程计算机上您想要的映像的路径复制（使用pwd命令查找）和{path_to_local_directory}是本地目录的路径，您希望在那里显示您的情节。

编辑：

对于新人。这是一个更复杂的解决方案。这个问题的作者提供了解决这个问题的简单解决方案。检查一下：Issue with tkinter, python and seaborn: _tkinter.TclError: no display name and no $DISPLAY environment variable

无法使用pyplot，pandas绘制图形：_tkinter.TclError：没有显示名称和没有$ DISPLAY环境变量

1 个答案: