Feel free to use single and double quotes together.
table = pd.read_sql("select * from TABLE where t.month='2019/10' ", con)
or escape them with backslash:
table = pd.read_sql("select * from TABLE where t.month=\"2019/10\" ", con)
or use triple quotes…
Look for more here: https://stackoverflow.com/a/9050384/4440387
It works ! I remember the quotes regulation of Python at fundamental course but cannot find the module ^^