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bpo-33305: Improve SyntaxError for invalid numerical literals. (GH-6517)

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Serhiy Storchaka 2018-07-09 15:09:35 +03:00 • committed by GitHub
parent 2a9b8babf0
commit cf7303ed2a
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3 changed files with 77 additions and 13 deletions
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24
Lib/test/test_grammar.py
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@ -100,6 +100,8 @@ INVALID_UNDERSCORE_LITERALS = [
class TokenTests(unittest.TestCase):
check_syntax_error = check_syntax_error
def test_backslash(self):
# Backslash means line continuation:
x = 1 \
@ -184,6 +186,28 @@ class TokenTests(unittest.TestCase):
# Sanity check: no literal begins with an underscore
self.assertRaises(NameError, eval, "_0")
def test_bad_numerical_literals(self):
check = self.check_syntax_error
check("0b12", "invalid digit '2' in binary literal")
check("0b1_2", "invalid digit '2' in binary literal")
check("0b2", "invalid digit '2' in binary literal")
check("0b1_", "invalid binary literal")
check("0b", "invalid binary literal")
check("0o18", "invalid digit '8' in octal literal")
check("0o1_8", "invalid digit '8' in octal literal")
check("0o8", "invalid digit '8' in octal literal")
check("0o1_", "invalid octal literal")
check("0o", "invalid octal literal")
check("0x1_", "invalid hexadecimal literal")
check("0x", "invalid hexadecimal literal")
check("1_", "invalid decimal literal")
check("012",
"leading zeros in decimal integer literals are not permitted; "
"use an 0o prefix for octal integers")
check("1.2_", "invalid decimal literal")
check("1e2_", "invalid decimal literal")
check("1e+", "invalid decimal literal")
def test_string_literals(self):
x = ''; y = ""; self.assertTrue(len(x) == 0 and x == y)
x = '\''; y = "'"; self.assertTrue(len(x) == 1 and x == y and ord(x) == 39)