python以下导入包的格式错误的是_python–Pydot错误：无法识别文件格式“png”...

我需要通过pydot构建一个

pythonic图解决方案,并尝试运行一个简单的代码,如&＃xff1a;

import pydot

graph &＃61; pydot.Dot(graph_type&＃61;&＃39;graph&＃39;)

i&＃61;1

edge &＃61; pydot.Edge("A", "B%d" % i)

graph.add_edge(edge)

graph.write_png(&＃39;graph.png&＃39;)

这是为了在png文件上构建一个简单的图形(A-B1).

在解决了很多错误配置后,现在我得到了&＃xff1a;

Traceback (most recent call last):

File "/Users/zallaricardo/Documents/Python/test_png.py", line 7, in

graph.write_png(&＃39;graph.png&＃39;)

File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pydot.py", line 1809, in

lambda path, f&＃61;frmt, prog&＃61;self.prog : self.write(path, format&＃61;f, prog&＃61;prog))

File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pydot.py", line 1911, in write

dot_fd.write(self.create(prog, format))

File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pydot.py", line 2023, in create

status, stderr_output) )

pydot.InvocationException: Program terminated with status: 1. stderr follows: Format: "png" not recognized. Use one of:

logout

直到现在还无法找到我特定环境的直接解决方案.

有关如何修复它的任何提示&＃xff1f;

需要适用于python 2.7和mac os x 10.9.

我目前安装的包&＃xff1a;

cycler&＃61;&＃61;0.9.0

decorator&＃61;&＃61;4.0.4

graphviz&＃61;&＃61;0.4.7

matplotlib&＃61;&＃61;1.5.0

networkx&＃61;&＃61;1.10

numpy&＃61;&＃61;1.10.1

pydot2&＃61;&＃61;1.0.33

pyparsing&＃61;&＃61;1.5.7

PyPDF2&＃61;&＃61;1.25.1

python-dateutil&＃61;&＃61;2.4.2

pytz&＃61;&＃61;2015.7

six&＃61;&＃61;1.10.0

wheel&＃61;&＃61;0.26.0