Pydot错误，涉及解析“:"字符和数字

问题描述

所以我在Anaconda的python 2.7中使用pydot，并注意到当我尝试在Pydot中使用某些字符串时，我不断收到错误消息.

So I was using pydot in python 2.7 from Anaconda and noticed I keep getting errors when I attempt to use certain strings in Pydot.

我隔离到的错误:

import pydot


graph = pydot.Dot(graph_type='digraph', rankdir = 'LR')
S = 'Total Flow Count ' + ':' + str(3)
legend = pydot.Node('Legend', label=S, shape='rectangle')

graph.add_node(legend)

每次运行此命令时，都会得到以下输出:

Whenever I run this I get the following output:

Traceback (most recent call last):
  File "path\of\my\code\errorisolate.py", line 13, in <module>
    graph.write_png('example5graph.png')
  File "c:\Anaconda\lib\site-packages\pydot.py", line 1609, in <lambda>
    lambda path, f=frmt, prog=self.prog : self.write(path, format=f, prog=prog))
  File "c:\Anaconda\lib\site-packages\pydot.py", line 1703, in write
dot_fd.write(self.create(prog, format))
  File "c:\Anaconda\lib\site-packages\pydot.py", line 1803, in create
status, stderr_output) )
InvocationException: Program terminated with status: 6. stderr follows: Error: c:\users\sidharth\appdata\local\temp\tmpxvwsls:3: syntax error near line 3

context: Legend [shape=rectangle, label=Total Flow Count >>>  : <<< 3];

到目前为止的分析/工作:

以某种方式将冒号:"后跟str()格式的数字组合似乎会引发错误.我尝试通过在前面附加'r'来修复它，因为我知道这是一种修复包含'\ n'字符的错误的方法.但是即使那样也没有运气.

Analysis/Work So Far:

Somehow the combination of a colon character ':' followed by a number in str() format seems to raise an error. I tried to fix it by append the 'r' in front since I know that is a way to fix errors invlving the '\n' character. But even then no luck.

我删除了r，因为它似乎引起了一些混乱.我一直使用r':'来模拟非编译换行符'\ n'的问题，因为pydot要求将它们列为r'\ n'，其中r并未明确定义.

I removed the r as it appears to be causing a little confusion. I had kept r':' hoping to emulate the solution to the problem of non compiling newlines '\n', since pydot requires them to be listed as r'\n' where r is explicitly not defined.

按照:

Pydot在换行符上玩的不好吗?

推荐答案

我发现了这个问题编号38 -表示不能在节点名称或标签中使用特殊符号(例如冒号).它突出显示的原因是-

I found this issue number 38 - Which says we cannot use special symbols (like colon) in node names or labels. The reason it has highlighted is -

例如:(注意实际字符串中的双引号):

For instance: (note the double quotes in the actual string):

node = pydot.Node('"Testnode:###@"')

print node.get_name()
'"Testnode:###@"'

尽管最好不要以自己的名字冒号.

Though you may be better off not having colon in your name.

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