Python 通过 ssh 使用 tkinter 没有显示名称和 $DISPLAY 环境变量
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No display name and no $DISPLAY environment variable using tkinter through ssh
提问by Gabriel
I'm trying to run a very simple code that outputs a .png file in a cluster. Here's the code:
我正在尝试运行一个非常简单的代码，该代码在集群中输出一个 .png 文件。这是代码：
import matplotlib.pyplot as plt
import numpy as np
x = np.random.randn(60)
y = np.random.randn(60)
plt.scatter(x, y, s=20)
out_png = 'path/to/store/out_file.png'
plt.savefig(out_png, dpi=150)
If I run this code with the command python simple_code.pyin my system which has matplotlib 1.2.1 installed I get the warning:
如果我使用python simple_code.py安装了 matplotlib 1.2.1 的系统中的命令运行此代码，则会收到警告：
Unable to load library icui18n "Cannot load library icui18n:
The .png image is still produced so I have no problems here. But if I use the same command and code in a cluster which has matplotlib 1.3.0 installed it fails with the error:
.png 图像仍在生成，所以我在这里没有问题。但是如果我在安装了 matplotlib 1.3.0 的集群中使用相同的命令和代码，它会失败并显示错误：
Traceback (most recent call last):
File "simple_code.py", line 33, in <module>
plt.scatter(x, y, s=20)
File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 3078, in scatter
ax = gca()
File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 803, in gca
ax = gcf().gca(**kwargs)
File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 450, in gcf
return figure()
File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 423, in figure
**kwargs)
File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py", line 79, in new_figure_manager
return new_figure_manager_given_figure(num, figure)
File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py", line 87, in new_figure_manager_given_figure
window = Tk.Tk()
File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1712, in __init__
self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: no display name and no $DISPLAY environment variable
What is happening here?
这里发生了什么？
Add, this is the script I use to login into the cluster:
添加，这是我用来登录集群的脚本：
#!/usr/bin/expect
set login "user"
set addr "address1"
set addr2 "address2"
set pw "password"
spawn ssh -X $login@$addr
expect "$login@$addr\'s password:"
send "$pw\r"
expect "$login@host:"
send "ssh -X $addr2\r"
expect "$login@$addr\'s password:"
send "$pw\r"
interact
回答by luturo
Your problem is in ssh command. What you need to do is to write it this way:
您的问题出在 ssh 命令中。你需要做的是这样写：
ssh -X "your_login"
