Python 在agraph.py中将字符串传递给agedge。networkx和pygraphviz出现问题

给出这个初始图：

import networkx as nx
G=nx.MultiGraph()
fromnodes=[0,0,1,1,1,1,1,2,3,4,5,5,5,7,8,9,10]
tonodes=[1,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]
dupedgeind=0
for x,y in zip(fromnodes,tonodes):
    if G.has_edge(x,y):
        dupedgeind=dupedgeind+1
        G.add_edge(x,y,key=dupedgeind)
    else:
        dupedgeind=0
        G.add_edge(x,y,key=dupedgeind)

有人能重现这个错误吗

pos=nx.nx_agraph.pygraphviz_layout(G,prog='sfdp')

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python27\lib\site-packages\networkx\drawing\nx_agraph.py", line 262, in pygraphviz_layout
    A=to_agraph(G)
  File "C:\Python27\lib\site-packages\networkx\drawing\nx_agraph.py", line 155, in to_agraph
    A.add_edge(u,v,key=str(key),**str_edgedata)
  File "C:\Python27\lib\site-packages\pygraphviz\agraph.py", line 484, in add_edge
    eh = gv.agedge(self.handle, uh, vh, key, _Action.find)
KeyError: 'agedge: no key'

到

它不再失败（但会丢失密钥标签）

是否有一种明显的方法来修复此问题（以便保留

键

参数值）？-我尝试的任何方法似乎都不起作用

接下来最明智的调试步骤是什么？

---

从中，似乎

c

agedge函数（我看不出来，因为它是在.pyd二进制文件中）具有以下格式：

*agedge(Agraph_t *g, Agnode_t *t, Agnode_t *h, char *name, int createflag)

其中，

char*name

是键

我无法理解为什么它不接受初始错误中的

str

dtype

---

注：版本：

networkx-1.11， pygraphviz-1.3.1 （安装于） 在Windows7（64位）上的Python 2.7（32位-通过Python（x，y）输入），GraphViz-2.38

我也在这些问题中看到了这个问题：

---

更新1

我已尝试将agedge函数的

键

输入调整为字符数组的多种变体（例如

（ct.c_char_p*len（key））（key）

（ct是基于ctypes模块）。这会将错误更改为：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python27\lib\site-packages\networkx\drawing\nx_agraph.py", line 262, in pygraphviz_layout
    A=to_agraph(G)
  File "C:\Python27\lib\site-packages\networkx\drawing\nx_agraph.py", line 155, in to_agraph
    A.add_edge(u,v,str(key),**str_edgedata)
  File "C:\Python27\lib\site-packages\pygraphviz\agraph.py", line 482, in add_edge
    eh = gv.agedge(self.handle, uh, vh, (ct.c_char_p * len(key))(key), _Action.create)
TypeError: in method 'agedge', argument 4 of type 'char *'

与

我不知道为什么仅仅对字符串

str（key）

进行强制转换不起作用

更新3-使用功能进行编辑

在这里找到函数-

更新4:

错误源位于pygraphviz文件graphviz_wrap.c第3921行：

SWIGINTERN PyObject *_wrap_agedge(PyObject *SWIGUNUSEDPARM(self), PyObject *args) {
    PyObject *resultobj = 0;
    Agraph_t *arg1 = (Agraph_t *) 0 ;
    Agnode_t *arg2 = (Agnode_t *) 0 ;
    Agnode_t *arg3 = (Agnode_t *) 0 ;
    char *arg4 = (char *) 0 ;
    int arg5 ;
    void *argp1 = 0 ;
    int res1 = 0 ;
    void *argp2 = 0 ;
    int res2 = 0 ;
    void *argp3 = 0 ;
    int res3 = 0 ;
    int res4 ;
    char *buf4 = 0 ;
    int alloc4 = 0 ;
    int val5 ;
    int ecode5 = 0 ;
    PyObject * obj0 = 0 ;
    PyObject * obj1 = 0 ;
    PyObject * obj2 = 0 ;
    PyObject * obj3 = 0 ;
    PyObject * obj4 = 0 ;
    Agedge_t *result = 0 ;

    if (!PyArg_ParseTuple(args, char*)"OOOOO:agedge",&obj0,&obj1,&obj2,&obj3,&obj4)) SWIG_fail; 
    res1 = SWIG_ConvertPtr(obj0, &argp1,SWIGTYPE_p_Agraph_t, 0 | 0 );
    if (!SWIG_IsOK(res1)) {
        SWIG_exception_fail(SWIG_ArgError(res1), "in method '""agedge" "', argument " "1"" of type '" "Agraph_t *""'");
    }
    arg1 = (Agraph_t *)(argp1);
    res2 = SWIG_ConvertPtr(obj1, &argp2,SWIGTYPE_p_Agnode_t, 0 | 0 );
    if (!SWIG_IsOK(res2)) {
        SWIG_exception_fail(SWIG_ArgError(res2), "in method '" "agedge" "', argument " "2"" of type '" "Agnode_t *""'");
    }
    arg2 = (Agnode_t *)(argp2);
    res3 = SWIG_ConvertPtr(obj2, &argp3,SWIGTYPE_p_Agnode_t, 0 | 0 );
    if (!SWIG_IsOK(res3)) {
        SWIG_exception_fail(SWIG_ArgError(res3), "in method '" "agedge" "', argument " "3"" of type '" "Agnode_t *""'");
    }
    arg3 = (Agnode_t *)(argp3);
    res4 = SWIG_AsCharPtrAndSize(obj3, &buf4, NULL, &alloc4);
    if (!SWIG_IsOK(res4)) {
        SWIG_exception_fail(SWIG_ArgError(res4), "in method '" "agedge" "', argument " "4"" of type '" "char *""'");
    }
    arg4 = (char *)(buf4);
    ecode5 = SWIG_AsVal_int(obj4, &val5);
    if (!SWIG_IsOK(ecode5)) {
        SWIG_exception_fail(SWIG_ArgError(ecode5), "in method '" "agedge" "', argument " "5"" of type '" "int""'");
    }
    arg5 = (int)(val5);
    {
        result = (Agedge_t *)agedge(arg1,arg2,arg3,arg4,arg5);
        if (!result) {
            PyErr_SetString(PyExc_KeyError,"agedge: no key");
            return NULL;
        }
    }
    resultobj = SWIG_NewPointerObj(SWIG_as_voidptr(result), SWIGTYPE_p_Agedge_t, 0 | 0 );
    if (alloc4 == SWIG_NEWOBJ) free((char*)buf4);
    return resultobj;
    fail:
        if (alloc4 == SWIG_NEWOBJ) free((char*)buf4);
        return NULL;
}

或者，在graphviz.i，第68行

---

无论哪种方式，如果

agedge

由于任何原因失败，似乎会返回错误字符串“agedge:no key”。。。也许这与SWIG有关。

尝试将变量名从“key”更改为类似“temp\u key”的其他名称。我的意思是，您（或任何以前导入的模块）可能在…之前声明了一个非字符串类型的“key”变量

显然，如果运行：

eh = gv.agedge(self.handle, uh, vh, key , _Action.create)

失败但正在运行：

eh = gv.agedge(self.handle, uh, vh, "key" , _Action.create)

没有问题，它只能与“key”变量类型相关。。你试过这个吗：

eh = gv.agedge(self.handle, uh, vh, str(key) , _Action.create)

或

eh=gv.agedge（self.handle，呃，vh，unicode（键），\u Action.create）

在原始代码中集成str（）/unicode（），给出：

import networkx as nx
G=nx.MultiGraph()
fromnodes=[0,0,1,1,1,1,1,2,3,4,5,5,5,7,8,9,10]
tonodes=[1,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]
dupedgeind=0
for x,y in zip(fromnodes,tonodes):
    if G.has_edge(x,y):
        dupedgeind=dupedgeind+1
        G.add_edge(x,y,key=str(dupedgeind))
        #G.add_edge(x,y,key=unicode(dupedgeind))
    else:
        dupedgeind=0
        G.add_edge(x,y,key=str(dupedgeind))
        #G.add_edge(x,y,key=unicode(dupedgeind))

两者（str和unicode版本）在Linux上都可以正常工作

---

致以最诚挚的问候

只是一个黑暗中的镜头，你是否尝试过将你的钥匙铸入字符串：

G.add_edge（x，y，key=str（dupedgeind））

？@atomh33ls我相信你有一些奇怪的环境问题。你的代码在我的电脑上运行得很好。我使用的是

networkx==1.11

，

pygraphviz==1.3.1

和graphviz

2.38.0

。您是否尝试在虚拟环境中运行代码？我还可以验证代码是否适用于我

networkx-1.11

、

pygraphviz-1.3.1

和

graphviz-2.38.0

。我的操作系统是Linux。也许有些东西弄错了？@atomh33ls您也可以尝试在这里获取pygraphviz和其他windows库。试试“官方CPython发行版”怎么样正如您从何处获得pygraphviz二进制文件的建议一样？此处的错误完全相同：看起来似乎与Microsoft Windows软件包安装/编译问题有关。谢谢-我也在问题中添加了该链接。您能否详细说明问题可能是什么？该问题似乎与变量“类型”或变量“类型转换”错误有关。因为如果在add_edge func中为key arg添加一个实数常量字符串参数，则不会出现错误。

SWIGINTERN PyObject *_wrap_agedge(PyObject *SWIGUNUSEDPARM(self), PyObject *args) {
    PyObject *resultobj = 0;
    Agraph_t *arg1 = (Agraph_t *) 0 ;
    Agnode_t *arg2 = (Agnode_t *) 0 ;
    Agnode_t *arg3 = (Agnode_t *) 0 ;
    char *arg4 = (char *) 0 ;
    int arg5 ;
    void *argp1 = 0 ;
    int res1 = 0 ;
    void *argp2 = 0 ;
    int res2 = 0 ;
    void *argp3 = 0 ;
    int res3 = 0 ;
    int res4 ;
    char *buf4 = 0 ;
    int alloc4 = 0 ;
    int val5 ;
    int ecode5 = 0 ;
    PyObject * obj0 = 0 ;
    PyObject * obj1 = 0 ;
    PyObject * obj2 = 0 ;
    PyObject * obj3 = 0 ;
    PyObject * obj4 = 0 ;
    Agedge_t *result = 0 ;

    if (!PyArg_ParseTuple(args, char*)"OOOOO:agedge",&obj0,&obj1,&obj2,&obj3,&obj4)) SWIG_fail; 
    res1 = SWIG_ConvertPtr(obj0, &argp1,SWIGTYPE_p_Agraph_t, 0 | 0 );
    if (!SWIG_IsOK(res1)) {
        SWIG_exception_fail(SWIG_ArgError(res1), "in method '""agedge" "', argument " "1"" of type '" "Agraph_t *""'");
    }
    arg1 = (Agraph_t *)(argp1);
    res2 = SWIG_ConvertPtr(obj1, &argp2,SWIGTYPE_p_Agnode_t, 0 | 0 );
    if (!SWIG_IsOK(res2)) {
        SWIG_exception_fail(SWIG_ArgError(res2), "in method '" "agedge" "', argument " "2"" of type '" "Agnode_t *""'");
    }
    arg2 = (Agnode_t *)(argp2);
    res3 = SWIG_ConvertPtr(obj2, &argp3,SWIGTYPE_p_Agnode_t, 0 | 0 );
    if (!SWIG_IsOK(res3)) {
        SWIG_exception_fail(SWIG_ArgError(res3), "in method '" "agedge" "', argument " "3"" of type '" "Agnode_t *""'");
    }
    arg3 = (Agnode_t *)(argp3);
    res4 = SWIG_AsCharPtrAndSize(obj3, &buf4, NULL, &alloc4);
    if (!SWIG_IsOK(res4)) {
        SWIG_exception_fail(SWIG_ArgError(res4), "in method '" "agedge" "', argument " "4"" of type '" "char *""'");
    }
    arg4 = (char *)(buf4);
    ecode5 = SWIG_AsVal_int(obj4, &val5);
    if (!SWIG_IsOK(ecode5)) {
        SWIG_exception_fail(SWIG_ArgError(ecode5), "in method '" "agedge" "', argument " "5"" of type '" "int""'");
    }
    arg5 = (int)(val5);
    {
        result = (Agedge_t *)agedge(arg1,arg2,arg3,arg4,arg5);
        if (!result) {
            PyErr_SetString(PyExc_KeyError,"agedge: no key");
            return NULL;
        }
    }
    resultobj = SWIG_NewPointerObj(SWIG_as_voidptr(result), SWIGTYPE_p_Agedge_t, 0 | 0 );
    if (alloc4 == SWIG_NEWOBJ) free((char*)buf4);
    return resultobj;
    fail:
        if (alloc4 == SWIG_NEWOBJ) free((char*)buf4);
        return NULL;
}

eh = gv.agedge(self.handle, uh, vh, key , _Action.create)

eh = gv.agedge(self.handle, uh, vh, "key" , _Action.create)

eh = gv.agedge(self.handle, uh, vh, str(key) , _Action.create)

import networkx as nx
G=nx.MultiGraph()
fromnodes=[0,0,1,1,1,1,1,2,3,4,5,5,5,7,8,9,10]
tonodes=[1,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]
dupedgeind=0
for x,y in zip(fromnodes,tonodes):
    if G.has_edge(x,y):
        dupedgeind=dupedgeind+1
        G.add_edge(x,y,key=str(dupedgeind))
        #G.add_edge(x,y,key=unicode(dupedgeind))
    else:
        dupedgeind=0
        G.add_edge(x,y,key=str(dupedgeind))
        #G.add_edge(x,y,key=unicode(dupedgeind))