Still reproducible under current pydot 1.4.1:

import pydot
graph = pydot.Dot()
nodeA = pydot.Node('Node A')
graph.add_node(nodeA)
graph.get_node('Node A')   # returns: []
graph.get_node('"Node A"')  # returns: [<pydot.Node object at 0x7f08ea413470>]

@qinyeli This is also in reply to your PR #181. Sorry your work did not get reviewed earlier. I am actually thinking of solving this issue by having pydot internally store ID names unquoted and, if necessary, store information about quoting style in a separate pydot attribute, starting with pydot 2.0.0. See my comments in the last two paragraphs of #72 (comment). I assume that, once this new model is in place, changes to get_edge() and get_node() should not be necessary anymore. At the same time, PR #181 is also not really suitable for the upcoming pydot 1.4.2 release, because that will just be a bug-fix/point release and probably the last in the pydot 1.x series, so we need to keep the risk of regressions low. So, I am afraid I will be closing your PR, unless you have any comments. Please let me know if want to get involved in implementing the new model I described, though be prepared it will cost a lot more time and effort, as it affects many parts of the code and raises many side questions, some already described in #72 (comment).

As a workaround, this worked for me:

def getnode(dott,lbl):
'''dott: dot object containing node to search for \n
lbl: node name (str)'''
nodez = dott.get_nodes()
for noad in nodez:
if noad.obj_dict['attributes']['label'].startswith(r'"{'+lbl+'|'):
return noad

This works because all of my nodes have the shape "record", with the format below:
'label':"{Node_Name|HIGH : int\lLOW : int\lMEDIUM : int\loptions : set, NoneType\lsupported_ds : list\l|get_test(severity, name, variable)\lsetup(ds)\l}"
You may need to adjust the validation function to taste depending on where your node name is located, I'm not sure. Just make sure it gives you a specific validation, using lbl in ... could be problematic if there is another name which includes the name being searched.