Matplotlib似乎需要$ DISPLAY環(huán)境變量，這意味著X服務(wù)器正在運(yùn)行。某些Web托管服務(wù)不允許運(yùn)行X服務(wù)器會(huì)話。有沒有一種方法可以在不運(yùn)行X服務(wù)器的情況下使用matplotlib生成圖形？[username@hostname ~]$ python2.6Python 2.6.5 (r265:79063, Nov 23 2010, 02:02:03)[GCC 4.1.2 20080704 (Red Hat 4.1.2-48)] on linux2Type "help", "copyright", "credits" or "license" for more information.>>> import matplotlib.pyplot as plt>>> fig = plt.figure()Traceback (most recent call last):  File "<stdin>", line 1, in <module>  File "/home/username/lib/python2.6/matplotlib-1.0.1-py2.6-linux-i686.egg/matplotlib/pyplot.py", line 270, in figure    **kwargs)  File "/home/username/lib/python2.6/matplotlib-1.0.1-py2.6-linux-i686.egg/matplotlib/backends/backend_tkagg.py", line 80, in new_figure_manager    window = Tk.Tk()  File "/usr/local/lib/python2.6/lib-tk/Tkinter.py", line 1643, in __init__    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)_tkinter.TclError: no display name and no $DISPLAY environment variable>>>