Walrus operator throws #3

Parsing python that uses the walrus operator is throwing errors.

if e := tc.get("exception"):

line 78:18 extraneous input '=' expecting {STRING, NUMBER, 'return', 'raise', 'from', 'import', 'global', 'nonlocal', 'assert', 'lambda', 'not', 'None', 'True', 'False', 'yield', 'del', 'pass', 'continue', 'break', 'await', NEWLINE, NAME, '...', '*', '(', '[', '+', '-', '~', '{'}