Graph does not show

Notebook
1

This worked but now it does not. I dont think i changed anything:
import matplotlib.pyplot as grf

pobedemanunited = [16,21,18,19,25,18,19,20,19,28]
izgubljenemanunited = [12,6,8,10,7,5,10,8,12,5]
izjednacenemanunited = [10,11,12,9,6,15,9,10,7,5]
brpoenamanutd=(len(pobedemanunited)*3+len(izjednacenemanunited))

pobedemancity = [29,27,26,32,32,23,19,24,27,23]
izgubljenemancity = [3,6,9,4,2,6,10,7,6,6]
izjednacenemancity = [6,5,3,2,4,9,9,7,5,9]
brpoeanmancity=(len(pobedemancity)*3+len(izjednacenemancity))

pobedeliverpool=[28,20,32,30,21,22,16,18,26,16]
izgubljeneliverpool=[2,9,3,1,5,6,10,12,6,9]
izjednaceneliverpool=[8,9,3,7,12,10,12,8,6,13]
brpoenaliverpool=(len(pobedeliverpool)*3+len(izjednaceneliverpool))

pobedearsenal=[22,18,14,21,19,23,20,22,24,21]
izgubljenearsenal=[13,13,10,10,13,9,7,7,7,7]
izjednacenearsenal=[3,7,14,7,6,6,11,9,7,10]
brpoenachelsea=(len(pobedearsenal)*3+len(izjednacenearsenal))

pobedechelsea=[21,19,20,21,21,30,12,26,25,22]
izgubljenechelsea=[6,9,12,8,10,5,12,3,6,7]
izjednacenechelsea=[11,10,6,9,7,3,14,9,7,9]
brpoeanchelsea=(len(pobedechelsea)*3+len(izjednacenechelsea))

sezone = [‘21’, ‘20’, ‘19’, ‘18’, ‘17’, ‘16’, ‘15’, ‘14’, ‘13’, ‘12’]
grf.figure(figsize=(30,10))
grf.title(“Pobede u zadnjih deset godina”)
grf.xlabel(“Vremenski period”)
grf.ylabel(“Pobede”)
grf.plot(sezone, pobedemanunited)
grf.show()
grf.close

2

your ‘quote’ and “double-quotes” are kind of off in the end.
with “normal” quotations i get a plot with your code.

sezone = ["21", "20", "19", "18", "17", "16", "15", "14", "13", "12"]
...
grf.title("Pobede u zadnjih deset godina")
grf.xlabel("Vremenski period")
grf.ylabel("Pobede")