python - Generating a PNG with matplotlib when DISPLAY is undefined -


i trying use networkx python. when run program error. there missing?

#!/usr/bin/env python  import networkx nx import matplotlib import matplotlib.pyplot import matplotlib.pyplot plt  g=nx.graph() g.add_node(1) g.add_nodes_from([2,3,4,5,6,7,8,9,10]) #nx.draw_graphviz(g) #nx_write_dot(g, 'node.png') nx.draw(g) plt.savefig("/var/www/node.png")   traceback (most recent call last):   file "graph.py", line 13, in <module>     nx.draw(g)   file "/usr/lib/pymodules/python2.5/networkx/drawing/nx_pylab.py", line 124, in draw     cf=pylab.gcf()   file "/usr/lib/pymodules/python2.5/matplotlib/pyplot.py", line 276, in gcf     return figure()   file "/usr/lib/pymodules/python2.5/matplotlib/pyplot.py", line 254, in figure     **kwargs)   file "/usr/lib/pymodules/python2.5/matplotlib/backends/backend_tkagg.py", line 90, in new_figure_manager     window = tk.tk()   file "/usr/lib/python2.5/lib-tk/tkinter.py", line 1650, in __init__     self.tk = _tkinter.create(screenname, basename, classname, interactive, wantobjects, usetk, sync, use) _tkinter.tclerror: no display name , no $display environment variable

i different error now:

#!/usr/bin/env python  import networkx nx import matplotlib import matplotlib.pyplot import matplotlib.pyplot plt  matplotlib.use('agg')  g=nx.graph() g.add_node(1) g.add_nodes_from([2,3,4,5,6,7,8,9,10]) #nx.draw_graphviz(g) #nx_write_dot(g, 'node.png') nx.draw(g) plt.savefig("/var/www/node.png") 
/usr/lib/pymodules/python2.5/matplotlib/__init__.py:835: userwarning:  call matplotlib.use() has no effect because the backend has been chosen; matplotlib.use() must called *before* pylab, matplotlib.pyplot, or matplotlib.backends imported first time.    if warn: warnings.warn(_use_error_msg) traceback (most recent call last):   file "graph.py", line 15, in <module>     nx.draw(g)   file "/usr/lib/python2.5/site-packages/networkx-1.2.dev-py2.5.egg/networkx/drawing/nx_pylab.py", line 124, in draw     cf=pylab.gcf()   file "/usr/lib/pymodules/python2.5/matplotlib/pyplot.py", line 276, in gcf     return figure()   file "/usr/lib/pymodules/python2.5/matplotlib/pyplot.py", line 254, in figure     **kwargs)   file "/usr/lib/pymodules/python2.5/matplotlib/backends/backend_tkagg.py", line 90, in new_figure_manager     window = tk.tk()   file "/usr/lib/python2.5/lib-tk/tkinter.py", line 1650, in __init__     self.tk = _tkinter.create(screenname, basename, classname, interactive, wantobjects, usetk, sync, use) _tkinter.tclerror: no display name , no $display environment variable

i different error now:

#!/usr/bin/env python  import networkx nx import matplotlib import matplotlib.pyplot import matplotlib.pyplot plt  matplotlib.use('agg')  g=nx.graph() g.add_node(1) g.add_nodes_from([2,3,4,5,6,7,8,9,10]) #nx.draw_graphviz(g) #nx_write_dot(g, 'node.png') nx.draw(g) plt.savefig("/var/www/node.png") 
/usr/lib/pymodules/python2.5/matplotlib/__init__.py:835: userwarning:  call matplotlib.use() has no effect because the backend has been chosen; matplotlib.use() must called *before* pylab, matplotlib.pyplot, or matplotlib.backends imported first time.    if warn: warnings.warn(_use_error_msg) traceback (most recent call last):   file "graph.py", line 15, in <module>     nx.draw(g)   file "/usr/lib/python2.5/site-packages/networkx-1.2.dev-py2.5.egg/networkx/drawing/nx_pylab.py", line 124, in draw     cf=pylab.gcf()   file "/usr/lib/pymodules/python2.5/matplotlib/pyplot.py", line 276, in gcf     return figure()   file "/usr/lib/pymodules/python2.5/matplotlib/pyplot.py", line 254, in figure     **kwargs)   file "/usr/lib/pymodules/python2.5/matplotlib/backends/backend_tkagg.py", line 90, in new_figure_manager     window = tk.tk()   file "/usr/lib/python2.5/lib-tk/tkinter.py", line 1650, in __init__     self.tk = _tkinter.create(screenname, basename, classname, interactive, wantobjects, usetk, sync, use) _tkinter.tclerror: no display name , no $display environment variable

the main problem (on system) matplotlib chooses x-using backend default. had same problem on 1 of servers. solution me add following code in place gets read before other pylab/matplotlib/pyplot import:

import matplotlib # force matplotlib not use xwindows backend. matplotlib.use('agg')

the alternative set in .matplotlibrc


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