micropython/tests/basics/assign_expr_syntaxerror.py

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# test SyntaxError with := operator
def test(code):
try:
print(eval(code))
except SyntaxError:
print('SyntaxError')
test("x := 1")
test("((x, y) := 1)")
test("([i := i + 1 for i in range(4)])")
test("([i := -1 for i, j in [(1, 2)]])")
test("([[(i := j) for i in range(2)] for j in range(2)])")
# this is currently allowed in MicroPython, but not in CPython
test("([[(j := i) for i in range(2)] for j in range(2)])")