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bpo-40334: produce specialised errors for del #19911

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Merged
gvanrossum merged 12 commits into from
May 11, 2020
+352 −181
Merged

bpo-40334: produce specialised errors for del #19911

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c2219f7
pegen: produce specialised messages for del
May 4, 2020
343ccb5
pegen: further improve del error messages
May 4, 2020
4029ee5
del: add more tests
May 4, 2020
f6b219f
pegen: fix del error messages for binary ops and others
May 5, 2020
9b11bed
pegen: add doctest back in
May 5, 2020
8b4ead5
grammar: reorder and add comment
May 5, 2020
fa21224
del: add even more tests
May 5, 2020
d101ac1
pegen: fix more del test cases
May 5, 2020
850ba88
grammar: reuse del_target_end in invalid_del_target
May 5, 2020
461fe85
grammar: add ENDMARKER to del_target_end
May 5, 2020
d462df9
Revert "grammar: add ENDMARKER to del_target_end"
May 11, 2020
566745e
make regen-pegen
May 11, 2020
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del: add more tests
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hauntsaninja
hauntsaninja committed May 11, 2020
commit 4029ee5a1b27dca4a065f507b976b79e69a39e51
16 changes: 16 additions & 0 deletions Lib/test/test_grammar.py
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Original file line number Diff line number Diff line change
Expand Up @@ -801,6 +801,22 @@ def test_del_stmt(self):
del abc
del x, y, (z, xyz)

x, y, z = "xyz"
del x
del y,
del (z)

a, b, c, d, e, f, g = "abcdefg"
del a, (b, c), (d, (e, f))

a, b, c, d, e, f, g = "abcdefg"
del a, [b, c], (d, [e, f])

abcd = list("abcd")
del abcd[1:2]

compile("del a, (b[0].c, (d.e, f.g[1:2])), [h.i.j], ()", "<testcase>", "exec")

def test_pass_stmt(self):
# 'pass'
pass
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27 changes: 23 additions & 4 deletions Lib/test/test_syntax.py
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Expand Up @@ -678,10 +678,29 @@ def test_assign_call(self):
self._check_error("f() = 1", "assign")

def test_assign_del(self):
self._check_error("del f()", "delete")
self._check_error("del 1", "delete")
self._check_error("del *x", "delete")
self._check_error("del x, f()", "delete")
self._check_error("del 1", "delete literal")
self._check_error("del (1, 2)", "delete literal")
self._check_error("del None", "delete None")
self._check_error("del *x", "delete starred")
self._check_error("del (*x)", "delete starred")
self._check_error("del (*x,)", "delete starred")
self._check_error("del [*x,]", "delete starred")
self._check_error("del f()", "delete function call")
self._check_error("del f(a, b)", "delete function call")
self._check_error("del o.f()", "delete function call")
self._check_error("del a[0]()", "delete function call")
self._check_error("del x, f()", "delete function call")
self._check_error("del f(), x", "delete function call")
self._check_error("del (a if True else b)", "delete conditional")
self._check_error("del +a", "delete operator")
self._check_error("del a, +b", "delete operator")
self._check_error("del a + b", "delete operator")
self._check_error("del (a + b, c)", "delete operator")
self._check_error("del (c[0], a + b)", "delete operator")
self._check_error("del (a := 5)", "delete named expression")
# We don't have a special message for this, but make sure we don't
# report "cannot delete name"
self._check_error("del a += b", "invalid syntax")

def test_global_param_err_first(self):
source = """if 1:
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