Topology not opening when saving it

[Nasaaaaaa12]

while trying to open my saved topology it open as empty with the following error:

topo=none
Exception in Tkinter callback
Traceback (most recent call last):
File '"usr/lib/python3.10/tkinter/init.py", line 1923, in call return self.func(*args)
File "/home/mininet/examples/miniedit.py", line 1486, in loadTopology hosts = loadedTopology['hosts']
keyErrror: 'hosts'

[BlueShahriar]

Hello @Nasaaaaaa12,
Can you provide your saved topology? (the .mn file you saved topology into)
Regards.

[sevenwhiteclouds]

I've fixed this issue in pull request #1208. This issue occurs when running miniedit with Python 3. In Python 2, there is a need for .encode('utf-8'), but in Python 3, the string is already in the correct format. Running the same code converts the string to a bytes literal, resulting in the addition of a "b" before the string, like this: b'hostname'.