diff options
Diffstat (limited to 'Lib/test/test_syntax.py')
| -rw-r--r-- | Lib/test/test_syntax.py | 152 |
1 files changed, 105 insertions, 47 deletions
diff --git a/Lib/test/test_syntax.py b/Lib/test/test_syntax.py index 2c27bf1e52..7994fe67e7 100644 --- a/Lib/test/test_syntax.py +++ b/Lib/test/test_syntax.py @@ -27,15 +27,15 @@ In ast.c, syntax errors are raised by calling ast_error(). Errors from set_context(): -TODO(jhylton): "assignment to None" is inconsistent with other messages - >>> obj.None = 1 Traceback (most recent call last): -SyntaxError: assignment to None (<doctest test.test_syntax[1]>, line 1) + File "<doctest test.test_syntax[1]>", line 1 +SyntaxError: cannot assign to None >>> None = 1 Traceback (most recent call last): -SyntaxError: assignment to None (<doctest test.test_syntax[2]>, line 1) + File "<doctest test.test_syntax[2]>", line 1 +SyntaxError: cannot assign to None It's a syntax error to assign to the empty tuple. Why isn't it an error to assign to the empty list? It will always raise some error at @@ -43,35 +43,43 @@ runtime. >>> () = 1 Traceback (most recent call last): -SyntaxError: can't assign to () (<doctest test.test_syntax[3]>, line 1) + File "<doctest test.test_syntax[3]>", line 1 +SyntaxError: can't assign to () >>> f() = 1 Traceback (most recent call last): -SyntaxError: can't assign to function call (<doctest test.test_syntax[4]>, line 1) + File "<doctest test.test_syntax[4]>", line 1 +SyntaxError: can't assign to function call >>> del f() Traceback (most recent call last): -SyntaxError: can't delete function call (<doctest test.test_syntax[5]>, line 1) + File "<doctest test.test_syntax[5]>", line 1 +SyntaxError: can't delete function call >>> a + 1 = 2 Traceback (most recent call last): -SyntaxError: can't assign to operator (<doctest test.test_syntax[6]>, line 1) + File "<doctest test.test_syntax[6]>", line 1 +SyntaxError: can't assign to operator >>> (x for x in x) = 1 Traceback (most recent call last): -SyntaxError: can't assign to generator expression (<doctest test.test_syntax[7]>, line 1) + File "<doctest test.test_syntax[7]>", line 1 +SyntaxError: can't assign to generator expression >>> 1 = 1 Traceback (most recent call last): -SyntaxError: can't assign to literal (<doctest test.test_syntax[8]>, line 1) + File "<doctest test.test_syntax[8]>", line 1 +SyntaxError: can't assign to literal >>> "abc" = 1 Traceback (most recent call last): -SyntaxError: can't assign to literal (<doctest test.test_syntax[9]>, line 1) + File "<doctest test.test_syntax[8]>", line 1 +SyntaxError: can't assign to literal >>> `1` = 1 Traceback (most recent call last): -SyntaxError: can't assign to repr (<doctest test.test_syntax[10]>, line 1) + File "<doctest test.test_syntax[10]>", line 1 +SyntaxError: can't assign to repr If the left-hand side of an assignment is a list or tuple, an illegal expression inside that contain should still cause a syntax error. @@ -80,22 +88,26 @@ them. >>> (a, "b", c) = (1, 2, 3) Traceback (most recent call last): -SyntaxError: can't assign to literal (<doctest test.test_syntax[11]>, line 1) + File "<doctest test.test_syntax[11]>", line 1 +SyntaxError: can't assign to literal >>> [a, b, c + 1] = [1, 2, 3] Traceback (most recent call last): -SyntaxError: can't assign to operator (<doctest test.test_syntax[12]>, line 1) + File "<doctest test.test_syntax[12]>", line 1 +SyntaxError: can't assign to operator >>> a if 1 else b = 1 Traceback (most recent call last): -SyntaxError: can't assign to conditional expression (<doctest test.test_syntax[13]>, line 1) + File "<doctest test.test_syntax[13]>", line 1 +SyntaxError: can't assign to conditional expression From compiler_complex_args(): >>> def f(None=1): ... pass Traceback (most recent call last): -SyntaxError: assignment to None (<doctest test.test_syntax[14]>, line 1) + File "<doctest test.test_syntax[14]>", line 1 +SyntaxError: cannot assign to None From ast_for_arguments(): @@ -103,22 +115,26 @@ From ast_for_arguments(): >>> def f(x, y=1, z): ... pass Traceback (most recent call last): -SyntaxError: non-default argument follows default argument (<doctest test.test_syntax[15]>, line 1) + File "<doctest test.test_syntax[15]>", line 1 +SyntaxError: non-default argument follows default argument >>> def f(x, None): ... pass Traceback (most recent call last): -SyntaxError: assignment to None (<doctest test.test_syntax[16]>, line 1) + File "<doctest test.test_syntax[16]>", line 1 +SyntaxError: cannot assign to None >>> def f(*None): ... pass Traceback (most recent call last): -SyntaxError: assignment to None (<doctest test.test_syntax[17]>, line 1) + File "<doctest test.test_syntax[17]>", line 1 +SyntaxError: cannot assign to None >>> def f(**None): ... pass Traceback (most recent call last): -SyntaxError: assignment to None (<doctest test.test_syntax[18]>, line 1) + File "<doctest test.test_syntax[18]>", line 1 +SyntaxError: cannot assign to None From ast_for_funcdef(): @@ -126,7 +142,8 @@ From ast_for_funcdef(): >>> def None(x): ... pass Traceback (most recent call last): -SyntaxError: assignment to None (<doctest test.test_syntax[19]>, line 1) + File "<doctest test.test_syntax[19]>", line 1 +SyntaxError: cannot assign to None From ast_for_call(): @@ -138,7 +155,8 @@ From ast_for_call(): [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] >>> f(x for x in L, 1) Traceback (most recent call last): -SyntaxError: Generator expression must be parenthesized if not sole argument (<doctest test.test_syntax[23]>, line 1) + File "<doctest test.test_syntax[23]>", line 1 +SyntaxError: Generator expression must be parenthesized if not sole argument >>> f((x for x in L), 1) [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] @@ -170,7 +188,8 @@ SyntaxError: Generator expression must be parenthesized if not sole argument (<d ... i244, i245, i246, i247, i248, i249, i250, i251, i252, ... i253, i254, i255) Traceback (most recent call last): -SyntaxError: more than 255 arguments (<doctest test.test_syntax[25]>, line 1) + File "<doctest test.test_syntax[25]>", line 1 +SyntaxError: more than 255 arguments The actual error cases counts positional arguments, keyword arguments, and generator expression arguments separately. This test combines the @@ -204,42 +223,50 @@ three. ... (x for x in i244), i245, i246, i247, i248, i249, i250, i251, ... i252=1, i253=1, i254=1, i255=1) Traceback (most recent call last): -SyntaxError: more than 255 arguments (<doctest test.test_syntax[26]>, line 1) + File "<doctest test.test_syntax[26]>", line 1 +SyntaxError: more than 255 arguments >>> f(lambda x: x[0] = 3) Traceback (most recent call last): -SyntaxError: lambda cannot contain assignment (<doctest test.test_syntax[27]>, line 1) + File "<doctest test.test_syntax[27]>", line 1 +SyntaxError: lambda cannot contain assignment The grammar accepts any test (basically, any expression) in the keyword slot of a call site. Test a few different options. >>> f(x()=2) Traceback (most recent call last): -SyntaxError: keyword can't be an expression (<doctest test.test_syntax[28]>, line 1) + File "<doctest test.test_syntax[28]>", line 1 +SyntaxError: keyword can't be an expression >>> f(a or b=1) Traceback (most recent call last): -SyntaxError: keyword can't be an expression (<doctest test.test_syntax[29]>, line 1) + File "<doctest test.test_syntax[29]>", line 1 +SyntaxError: keyword can't be an expression >>> f(x.y=1) Traceback (most recent call last): -SyntaxError: keyword can't be an expression (<doctest test.test_syntax[30]>, line 1) + File "<doctest test.test_syntax[30]>", line 1 +SyntaxError: keyword can't be an expression -From ast_for_expr_stmt(): +More set_context(): >>> (x for x in x) += 1 Traceback (most recent call last): -SyntaxError: augmented assignment to generator expression not possible (<doctest test.test_syntax[31]>, line 1) + File "<doctest test.test_syntax[31]>", line 1 +SyntaxError: can't assign to generator expression >>> None += 1 Traceback (most recent call last): -SyntaxError: assignment to None (<doctest test.test_syntax[32]>, line 1) + File "<doctest test.test_syntax[32]>", line 1 +SyntaxError: cannot assign to None >>> f() += 1 Traceback (most recent call last): -SyntaxError: illegal expression for augmented assignment (<doctest test.test_syntax[33]>, line 1) + File "<doctest test.test_syntax[33]>", line 1 +SyntaxError: can't assign to function call Test continue in finally in weird combinations. -continue in for loop under finally shouuld be ok. +continue in for loop under finally should be ok. >>> def test(): ... try: @@ -261,7 +288,8 @@ Start simple, a continue in a finally should not be allowed. ... continue Traceback (most recent call last): ... - SyntaxError: 'continue' not supported inside 'finally' clause (<doctest test.test_syntax[36]>, line 6) + File "<doctest test.test_syntax[36]>", line 6 + SyntaxError: 'continue' not supported inside 'finally' clause This is essentially a continue in a finally which should not be allowed. @@ -276,7 +304,8 @@ This is essentially a continue in a finally which should not be allowed. ... pass Traceback (most recent call last): ... - SyntaxError: 'continue' not supported inside 'finally' clause (<doctest test.test_syntax[37]>, line 7) + File "<doctest test.test_syntax[37]>", line 6 + SyntaxError: 'continue' not supported inside 'finally' clause >>> def foo(): ... try: @@ -285,7 +314,8 @@ This is essentially a continue in a finally which should not be allowed. ... continue Traceback (most recent call last): ... - SyntaxError: 'continue' not supported inside 'finally' clause (<doctest test.test_syntax[38]>, line 5) + File "<doctest test.test_syntax[38]>", line 5 + SyntaxError: 'continue' not supported inside 'finally' clause >>> def foo(): ... for a in (): @@ -295,7 +325,8 @@ This is essentially a continue in a finally which should not be allowed. ... continue Traceback (most recent call last): ... - SyntaxError: 'continue' not supported inside 'finally' clause (<doctest test.test_syntax[39]>, line 6) + File "<doctest test.test_syntax[39]>", line 6 + SyntaxError: 'continue' not supported inside 'finally' clause >>> def foo(): ... for a in (): @@ -308,7 +339,8 @@ This is essentially a continue in a finally which should not be allowed. ... pass Traceback (most recent call last): ... - SyntaxError: 'continue' not supported inside 'finally' clause (<doctest test.test_syntax[40]>, line 7) + File "<doctest test.test_syntax[40]>", line 7 + SyntaxError: 'continue' not supported inside 'finally' clause >>> def foo(): ... for a in (): @@ -320,7 +352,8 @@ This is essentially a continue in a finally which should not be allowed. ... continue Traceback (most recent call last): ... - SyntaxError: 'continue' not supported inside 'finally' clause (<doctest test.test_syntax[41]>, line 8) + File "<doctest test.test_syntax[41]>", line 8 + SyntaxError: 'continue' not supported inside 'finally' clause There is one test for a break that is not in a loop. The compiler uses a single data structure to keep track of try-finally and loops, @@ -335,7 +368,8 @@ isn't, there should be a syntax error. ... print 3 Traceback (most recent call last): ... - SyntaxError: 'break' outside loop (<doctest test.test_syntax[42]>, line 3) + File "<doctest test.test_syntax[42]>", line 3 + SyntaxError: 'break' outside loop This should probably raise a better error than a SystemError (or none at all). In 2.5 there was a missing exception and an assert was triggered in a debug @@ -377,7 +411,8 @@ leading to spurious errors. ... pass Traceback (most recent call last): ... - SyntaxError: can't assign to function call (<doctest test.test_syntax[44]>, line 2) + File "<doctest test.test_syntax[44]>", line 2 + SyntaxError: can't assign to function call >>> if 1: ... pass @@ -385,7 +420,8 @@ leading to spurious errors. ... x() = 1 Traceback (most recent call last): ... - SyntaxError: can't assign to function call (<doctest test.test_syntax[45]>, line 4) + File "<doctest test.test_syntax[45]>", line 4 + SyntaxError: can't assign to function call >>> if 1: ... x() = 1 @@ -395,7 +431,8 @@ leading to spurious errors. ... pass Traceback (most recent call last): ... - SyntaxError: can't assign to function call (<doctest test.test_syntax[46]>, line 2) + File "<doctest test.test_syntax[46]>", line 2 + SyntaxError: can't assign to function call >>> if 1: ... pass @@ -405,7 +442,8 @@ leading to spurious errors. ... pass Traceback (most recent call last): ... - SyntaxError: can't assign to function call (<doctest test.test_syntax[47]>, line 4) + File "<doctest test.test_syntax[47]>", line 4 + SyntaxError: can't assign to function call >>> if 1: ... pass @@ -415,12 +453,32 @@ leading to spurious errors. ... x() = 1 Traceback (most recent call last): ... - SyntaxError: can't assign to function call (<doctest test.test_syntax[48]>, line 6) + File "<doctest test.test_syntax[48]>", line 6 + SyntaxError: can't assign to function call >>> f(a=23, a=234) Traceback (most recent call last): ... -SyntaxError: keyword argument repeated (<doctest test.test_syntax[49]>, line 1) + File "<doctest test.test_syntax[49]>", line 1 +SyntaxError: keyword argument repeated + +>>> del () +Traceback (most recent call last): + ... + File "<doctest test.test_syntax[50]>", line 1 +SyntaxError: can't delete () + +>>> {1, 2, 3} = 42 +Traceback (most recent call last): + ... + File "<doctest test.test_syntax[50]>", line 1 +SyntaxError: can't assign to literal + +Corner-case that used to crash: + + >>> def f(*xx, **__debug__): pass + Traceback (most recent call last): + SyntaxError: cannot assign to __debug__ """ @@ -506,7 +564,7 @@ class SyntaxTestCase(unittest.TestCase): def test_main(): test_support.run_unittest(SyntaxTestCase) from test import test_syntax - with test_support._check_py3k_warnings(("backquote not supported", + with test_support.check_py3k_warnings(("backquote not supported", SyntaxWarning)): test_support.run_doctest(test_syntax, verbosity=True) |