I meet a problem in Ubuntu 20.04 python3

Asked by TokiYe

I installed virtkey in Ubuntu 20.04 through "sudo apt-get install python3-virtkey".It's my first time to use virtkey . And I meet a problem.The system tells me that
"File 'shishi.py',line 3, in <module>
 v = virtkey.virtkey()
 virtkey.error: failed initialize dispaly : ("

I think when my code is run the system knows I tries to initialize.But I can't figure out what is able to cause initialization failure.

Here is my code:

import virtkey

v = virtkey.virtkey()
if v.press_unicode(ord('a'))==True:
    print ('YES!')

Can you give me some instructions?

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Manfred Hampl (m-hampl) said :

Probably the same problem as https://stackoverflow.com/q/38025503 (click on "show 4 more comments")

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TokiYe (tokiye) said :

thank you.With your help I can run my program very well!