Python 3.3+astterm

ast.Try

control flow

Node for try: body, a handlers list of ExceptHandler, orelse for the else branch and finalbody for the finally branch.

Syntax

ast.Try(body, handlers, orelse, finalbody)

Since Python 3.3 one node covers every form: try/finally without except is a Try with empty handlers, and the old TryExcept and TryFinally are gone. A construct with except* parses as TryStar instead, so a traversal that knows only Try misses it. The field order matches execution order: body, handlers on error, orelse without one, finalbody always.

Examples

import ast
t = ast.parse('try:\n    f()\nfinally:\n    g()').body[0]
print(type(t).__name__, t.handlers, len(t.finalbody))  # → Try [] 1

import ast
src = 'try:\n    f()\nexcept ValueError:\n    pass\nelse:\n    ok()'
t = ast.parse(src).body[0]
print(t.handlers[0].type.id, len(t.orelse))  # → ValueError 1

See also

Open in the full glossarydocs.python.orgReport an inaccuracy