python - 通过 ssh 使用 tkinter 没有显示名称和没有 $DISPLAY 环境变量

Question

这个问题在这里已经有了答案:

Generating a PNG with matplotlib when DISPLAY is undefined (13 个回答)

关闭 8年前。

我正在尝试运行一个在集群中输出 .png 文件的非常简单的代码。代码如下:

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)

如果我在安装了 matplotlib 1.2.1 的系统中使用命令 python simple_code.py 运行此代码，我会收到警告:

Unable to load library icui18n "Cannot load library icui18n:

.png 图像仍然生成，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，则会失败并出现错误:

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

这里发生了什么？

---

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

Answer 1

您的问题出在 ssh 命令中。你需要做的就是这样写:

ssh -X "your_login"