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# Python test set -- part 1, grammar. # This just tests whether the parser accepts them all. # NOTE: When you run this test as a script from the command line, you # get warnings about certain hex/oct constants. Since those are # issued by the parser, you can't suppress them by adding a # filterwarnings() call to this module. Therefore, to shut up the # regression test, the filterwarnings() call has been added to # regrtest.py. from test.support import run_unittest, check_syntax_error import unittest import sys # testing import * from sys import * class TokenTests(unittest.TestCase): def testBackslash(self): # Backslash means line continuation: x = 1 \ + 1 self.assertEquals(x, 2, 'backslash for line continuation') # Backslash does not means continuation in comments :\ x = 0 self.assertEquals(x, 0, 'backslash ending comment') def testPlainIntegers(self): self.assertEquals(type(000), type(0)) self.assertEquals(0xff, 255) self.assertEquals(0o377, 255) self.assertEquals(2147483647, 0o17777777777) self.assertEquals(0b1001, 9) # "0x" is not a valid literal self.assertRaises(SyntaxError, eval, "0x") from sys import maxsize if maxsize == 2147483647: self.assertEquals(-2147483647-1, -0o20000000000) # XXX -2147483648 self.assert_(0o37777777777 > 0) self.assert_(0xffffffff > 0) self.assert_(0b1111111111111111111111111111111 > 0) for s in ('2147483648', '0o40000000000', '0x100000000', '0b10000000000000000000000000000000'): try: x = eval(s) except OverflowError: self.fail("OverflowError on huge integer literal %r" % s) elif maxsize == 9223372036854775807: self.assertEquals(-9223372036854775807-1, -0o1000000000000000000000) self.assert_(0o1777777777777777777777 > 0) self.assert_(0xffffffffffffffff > 0) self.assert_(0b11111111111111111111111111111111111111111111111111111111111111 > 0) for s in '9223372036854775808', '0o2000000000000000000000', \ '0x10000000000000000', \ '0b100000000000000000000000000000000000000000000000000000000000000': try: x = eval(s) except OverflowError: self.fail("OverflowError on huge integer literal %r" % s) else: self.fail('Weird maxsize value %r' % maxsize) def testLongIntegers(self): x = 0 x = 0xffffffffffffffff x = 0Xffffffffffffffff x = 0o77777777777777777 x = 0O77777777777777777 x = 123456789012345678901234567890 x = 0b100000000000000000000000000000000000000000000000000000000000000000000 x = 0B111111111111111111111111111111111111111111111111111111111111111111111 def testFloats(self): x = 3.14 x = 314. x = 0.314 # XXX x = 000.314 x = .314 x = 3e14 x = 3E14 x = 3e-14 x = 3e+14 x = 3.e14 x = .3e14 x = 3.1e4 def testStringLiterals(self): x = ''; y = ""; self.assert_(len(x) == 0 and x == y) x = '\''; y = "'"; self.assert_(len(x) == 1 and x == y and ord(x) == 39) x = '"'; y = "\""; self.assert_(len(x) == 1 and x == y and ord(x) == 34) x = "doesn't \"shrink\" does it" y = 'doesn\'t "shrink" does it' self.assert_(len(x) == 24 and x == y) x = "does \"shrink\" doesn't it" y = 'does "shrink" doesn\'t it' self.assert_(len(x) == 24 and x == y) x = """ The "quick" brown fox jumps over the 'lazy' dog. """ y = '\nThe "quick"\nbrown fox\njumps over\nthe \'lazy\' dog.\n' self.assertEquals(x, y) y = ''' The "quick" brown fox jumps over the 'lazy' dog. ''' self.assertEquals(x, y) y = "\n\ The \"quick\"\n\ brown fox\n\ jumps over\n\ the 'lazy' dog.\n\ " self.assertEquals(x, y) y = '\n\ The \"quick\"\n\ brown fox\n\ jumps over\n\ the \'lazy\' dog.\n\ ' self.assertEquals(x, y) def testEllipsis(self): x = ... self.assert_(x is Ellipsis) self.assertRaises(SyntaxError, eval, ".. .") class GrammarTests(unittest.TestCase): # single_input: NEWLINE | simple_stmt | compound_stmt NEWLINE # XXX can't test in a script -- this rule is only used when interactive # file_input: (NEWLINE | stmt)* ENDMARKER # Being tested as this very moment this very module # expr_input: testlist NEWLINE # XXX Hard to test -- used only in calls to input() def testEvalInput(self): # testlist ENDMARKER x = eval('1, 0 or 1') def testFuncdef(self): ### [decorators] 'def' NAME parameters ['->' test] ':' suite ### decorator: '@' dotted_name [ '(' [arglist] ')' ] NEWLINE ### decorators: decorator+ ### parameters: '(' [typedargslist] ')' ### typedargslist: ((tfpdef ['=' test] ',')* ### ('*' [tfpdef] (',' tfpdef ['=' test])* [',' '**' tfpdef] | '**' tfpdef) ### | tfpdef ['=' test] (',' tfpdef ['=' test])* [',']) ### tfpdef: NAME [':' test] ### varargslist: ((vfpdef ['=' test] ',')* ### ('*' [vfpdef] (',' vfpdef ['=' test])* [',' '**' vfpdef] | '**' vfpdef) ### | vfpdef ['=' test] (',' vfpdef ['=' test])* [',']) ### vfpdef: NAME def f1(): pass f1() f1(*()) f1(*(), **{}) def f2(one_argument): pass def f3(two, arguments): pass self.assertEquals(f2.__code__.co_varnames, ('one_argument',)) self.assertEquals(f3.__code__.co_varnames, ('two', 'arguments')) def a1(one_arg,): pass def a2(two, args,): pass def v0(*rest): pass def v1(a, *rest): pass def v2(a, b, *rest): pass f1() f2(1) f2(1,) f3(1, 2) f3(1, 2,) v0() v0(1) v0(1,) v0(1,2) v0(1,2,3,4,5,6,7,8,9,0) v1(1) v1(1,) v1(1,2) v1(1,2,3) v1(1,2,3,4,5,6,7,8,9,0) v2(1,2) v2(1,2,3) v2(1,2,3,4) v2(1,2,3,4,5,6,7,8,9,0) def d01(a=1): pass d01() d01(1) d01(*(1,)) d01(**{'a':2}) def d11(a, b=1): pass d11(1) d11(1, 2) d11(1, **{'b':2}) def d21(a, b, c=1): pass d21(1, 2) d21(1, 2, 3) d21(*(1, 2, 3)) d21(1, *(2, 3)) d21(1, 2, *(3,)) d21(1, 2, **{'c':3}) def d02(a=1, b=2): pass d02() d02(1) d02(1, 2) d02(*(1, 2)) d02(1, *(2,)) d02(1, **{'b':2}) d02(**{'a': 1, 'b': 2}) def d12(a, b=1, c=2): pass d12(1) d12(1, 2) d12(1, 2, 3) def d22(a, b, c=1, d=2): pass d22(1, 2) d22(1, 2, 3) d22(1, 2, 3, 4) def d01v(a=1, *rest): pass d01v() d01v(1) d01v(1, 2) d01v(*(1, 2, 3, 4)) d01v(*(1,)) d01v(**{'a':2}) def d11v(a, b=1, *rest): pass d11v(1) d11v(1, 2) d11v(1, 2, 3) def d21v(a, b, c=1, *rest): pass d21v(1, 2) d21v(1, 2, 3) d21v(1, 2, 3, 4) d21v(*(1, 2, 3, 4)) d21v(1, 2, **{'c': 3}) def d02v(a=1, b=2, *rest): pass d02v() d02v(1) d02v(1, 2) d02v(1, 2, 3) d02v(1, *(2, 3, 4)) d02v(**{'a': 1, 'b': 2}) def d12v(a, b=1, c=2, *rest): pass d12v(1) d12v(1, 2) d12v(1, 2, 3) d12v(1, 2, 3, 4) d12v(*(1, 2, 3, 4)) d12v(1, 2, *(3, 4, 5)) d12v(1, *(2,), **{'c': 3}) def d22v(a, b, c=1, d=2, *rest): pass d22v(1, 2) d22v(1, 2, 3) d22v(1, 2, 3, 4) d22v(1, 2, 3, 4, 5) d22v(*(1, 2, 3, 4)) d22v(1, 2, *(3, 4, 5)) d22v(1, *(2, 3), **{'d': 4}) # keyword argument type tests try: str('x', **{b'foo':1 }) except TypeError: pass else: self.fail('Bytes should not work as keyword argument names') # keyword only argument tests def pos0key1(*, key): return key pos0key1(key=100) def pos2key2(p1, p2, *, k1, k2=100): return p1,p2,k1,k2 pos2key2(1, 2, k1=100) pos2key2(1, 2, k1=100, k2=200) pos2key2(1, 2, k2=100, k1=200) def pos2key2dict(p1, p2, *, k1=100, k2, **kwarg): return p1,p2,k1,k2,kwarg pos2key2dict(1,2,k2=100,tokwarg1=100,tokwarg2=200) pos2key2dict(1,2,tokwarg1=100,tokwarg2=200, k2=100) # keyword arguments after *arglist def f(*args, **kwargs): return args, kwargs self.assertEquals(f(1, x=2, *[3, 4], y=5), ((1, 3, 4), {'x':2, 'y':5})) self.assertRaises(SyntaxError, eval, "f(1, *(2,3), 4)") self.assertRaises(SyntaxError, eval, "f(1, x=2, *(3,4), x=5)") # argument annotation tests def f(x) -> list: pass self.assertEquals(f.__annotations__, {'return': list}) def f(x:int): pass self.assertEquals(f.__annotations__, {'x': int}) def f(*x:str): pass self.assertEquals(f.__annotations__, {'x': str}) def f(**x:float): pass self.assertEquals(f.__annotations__, {'x': float}) def f(x, y:1+2): pass self.assertEquals(f.__annotations__, {'y': 3}) def f(a, b:1, c:2, d): pass self.assertEquals(f.__annotations__, {'b': 1, 'c': 2}) def f(a, b:1, c:2, d, e:3=4, f=5, *g:6): pass self.assertEquals(f.__annotations__, {'b': 1, 'c': 2, 'e': 3, 'g': 6}) def f(a, b:1, c:2, d, e:3=4, f=5, *g:6, h:7, i=8, j:9=10, **k:11) -> 12: pass self.assertEquals(f.__annotations__, {'b': 1, 'c': 2, 'e': 3, 'g': 6, 'h': 7, 'j': 9, 'k': 11, 'return': 12}) # Check for SF Bug #1697248 - mixing decorators and a return annotation def null(x): return x @null def f(x) -> list: pass self.assertEquals(f.__annotations__, {'return': list}) # test MAKE_CLOSURE with a variety of oparg's closure = 1 def f(): return closure def f(x=1): return closure def f(*, k=1): return closure def f() -> int: return closure # Check ast errors in *args and *kwargs check_syntax_error(self, "f(*g(1=2))") check_syntax_error(self, "f(**g(1=2))") def testLambdef(self): ### lambdef: 'lambda' [varargslist] ':' test l1 = lambda : 0 self.assertEquals(l1(), 0) l2 = lambda : a[d] # XXX just testing the expression l3 = lambda : [2 < x for x in [-1, 3, 0]] self.assertEquals(l3(), [0, 1, 0]) l4 = lambda x = lambda y = lambda z=1 : z : y() : x() self.assertEquals(l4(), 1) l5 = lambda x, y, z=2: x + y + z self.assertEquals(l5(1, 2), 5) self.assertEquals(l5(1, 2, 3), 6) check_syntax_error(self, "lambda x: x = 2") check_syntax_error(self, "lambda (None,): None") l6 = lambda x, y, *, k=20: x+y+k self.assertEquals(l6(1,2), 1+2+20) self.assertEquals(l6(1,2,k=10), 1+2+10) ### stmt: simple_stmt | compound_stmt # Tested below def testSimpleStmt(self): ### simple_stmt: small_stmt (';' small_stmt)* [';'] x = 1; pass; del x def foo(): # verify statements that end with semi-colons x = 1; pass; del x; foo() ### small_stmt: expr_stmt | pass_stmt | del_stmt | flow_stmt | import_stmt | global_stmt | access_stmt # Tested below def testExprStmt(self): # (exprlist '=')* exprlist 1 1, 2, 3 x = 1 x = 1, 2, 3 x = y = z = 1, 2, 3 x, y, z = 1, 2, 3 abc = a, b, c = x, y, z = xyz = 1, 2, (3, 4) check_syntax_error(self, "x + 1 = 1") check_syntax_error(self, "a + 1 = b + 2") def testDelStmt(self): # 'del' exprlist abc = [1,2,3] x, y, z = abc xyz = x, y, z del abc del x, y, (z, xyz) def testPassStmt(self): # 'pass' pass # flow_stmt: break_stmt | continue_stmt | return_stmt | raise_stmt # Tested below def testBreakStmt(self): # 'break' while 1: break def testContinueStmt(self): # 'continue' i = 1 while i: i = 0; continue msg = "" while not msg: msg = "ok" try: continue msg = "continue failed to continue inside try" except: msg = "continue inside try called except block" if msg != "ok": self.fail(msg) msg = "" while not msg: msg = "finally block not called" try: continue finally: msg = "ok" if msg != "ok": self.fail(msg) def test_break_continue_loop(self): # This test warrants an explanation. It is a test specifically for SF bugs # #463359 and #462937. The bug is that a 'break' statement executed or # exception raised inside a try/except inside a loop, *after* a continue # statement has been executed in that loop, will cause the wrong number of # arguments to be popped off the stack and the instruction pointer reset to # a very small number (usually 0.) Because of this, the following test # *must* written as a function, and the tracking vars *must* be function # arguments with default values. Otherwise, the test will loop and loop. def test_inner(extra_burning_oil = 1, count=0): big_hippo = 2 while big_hippo: count += 1 try: if extra_burning_oil and big_hippo == 1: extra_burning_oil -= 1 break big_hippo -= 1 continue except: raise if count > 2 or big_hippo != 1: self.fail("continue then break in try/except in loop broken!") test_inner() def testReturn(self): # 'return' [testlist] def g1(): return def g2(): return 1 g1() x = g2() check_syntax_error(self, "class foo:return 1") def testYield(self): check_syntax_error(self, "class foo:yield 1") def testRaise(self): # 'raise' test [',' test] try: raise RuntimeError('just testing') except RuntimeError: pass try: raise KeyboardInterrupt except KeyboardInterrupt: pass def testImport(self): # 'import' dotted_as_names import sys import time, sys # 'from' dotted_name 'import' ('*' | '(' import_as_names ')' | import_as_names) from time import time from time import (time) # not testable inside a function, but already done at top of the module # from sys import * from sys import path, argv from sys import (path, argv) from sys import (path, argv,) def testGlobal(self): # 'global' NAME (',' NAME)* global a global a, b global one, two, three, four, five, six, seven, eight, nine, ten def testNonlocal(self): # 'nonlocal' NAME (',' NAME)* x = 0 y = 0 def f(): nonlocal x nonlocal x, y def testAssert(self): # assert_stmt: 'assert' test [',' test] assert 1 assert 1, 1 assert lambda x:x assert 1, lambda x:x+1 try: assert 0, "msg" except AssertionError as e: self.assertEquals(e.args[0], "msg") else: if __debug__: self.fail("AssertionError not raised by assert 0") ### compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt | funcdef | classdef # Tested below def testIf(self): # 'if' test ':' suite ('elif' test ':' suite)* ['else' ':' suite] if 1: pass if 1: pass else: pass if 0: pass elif 0: pass if 0: pass elif 0: pass elif 0: pass elif 0: pass else: pass def testWhile(self): # 'while' test ':' suite ['else' ':' suite] while 0: pass while 0: pass else: pass # Issue1920: "while 0" is optimized away, # ensure that the "else" clause is still present. x = 0 while 0: x = 1 else: x = 2 self.assertEquals(x, 2) def testFor(self): # 'for' exprlist 'in' exprlist ':' suite ['else' ':' suite] for i in 1, 2, 3: pass for i, j, k in (): pass else: pass class Squares: def __init__(self, max): self.max = max self.sofar = [] def __len__(self): return len(self.sofar) def __getitem__(self, i): if not 0 <= i < self.max: raise IndexError n = len(self.sofar) while n <= i: self.sofar.append(n*n) n = n+1 return self.sofar[i] n = 0 for x in Squares(10): n = n+x if n != 285: self.fail('for over growing sequence') result = [] for x, in [(1,), (2,), (3,)]: result.append(x) self.assertEqual(result, [1, 2, 3]) def testTry(self): ### try_stmt: 'try' ':' suite (except_clause ':' suite)+ ['else' ':' suite] ### | 'try' ':' suite 'finally' ':' suite ### except_clause: 'except' [expr ['as' expr]] try: 1/0 except ZeroDivisionError: pass else: pass try: 1/0 except EOFError: pass except TypeError as msg: pass except RuntimeError as msg: pass except: pass else: pass try: 1/0 except (EOFError, TypeError, ZeroDivisionError): pass try: 1/0 except (EOFError, TypeError, ZeroDivisionError) as msg: pass try: pass finally: pass def testSuite(self): # simple_stmt | NEWLINE INDENT NEWLINE* (stmt NEWLINE*)+ DEDENT if 1: pass if 1: pass if 1: # # # pass pass # pass # def testTest(self): ### and_test ('or' and_test)* ### and_test: not_test ('and' not_test)* ### not_test: 'not' not_test | comparison if not 1: pass if 1 and 1: pass if 1 or 1: pass if not not not 1: pass if not 1 and 1 and 1: pass if 1 and 1 or 1 and 1 and 1 or not 1 and 1: pass def testComparison(self): ### comparison: expr (comp_op expr)* ### comp_op: '<'|'>'|'=='|'>='|'<='|'!='|'in'|'not' 'in'|'is'|'is' 'not' if 1: pass x = (1 == 1) if 1 == 1: pass if 1 != 1: pass if 1 < 1: pass if 1 > 1: pass if 1 <= 1: pass if 1 >= 1: pass if 1 is 1: pass if 1 is not 1: pass if 1 in (): pass if 1 not in (): pass if 1 < 1 > 1 == 1 >= 1 <= 1 != 1 in 1 not in 1 is 1 is not 1: pass def testBinaryMaskOps(self): x = 1 & 1 x = 1 ^ 1 x = 1 | 1 def testShiftOps(self): x = 1 << 1 x = 1 >> 1 x = 1 << 1 >> 1 def testAdditiveOps(self): x = 1 x = 1 + 1 x = 1 - 1 - 1 x = 1 - 1 + 1 - 1 + 1 def testMultiplicativeOps(self): x = 1 * 1 x = 1 / 1 x = 1 % 1 x = 1 / 1 * 1 % 1 def testUnaryOps(self): x = +1 x = -1 x = ~1 x = ~1 ^ 1 & 1 | 1 & 1 ^ -1 x = -1*1/1 + 1*1 - ---1*1 def testSelectors(self): ### trailer: '(' [testlist] ')' | '[' subscript ']' | '.' NAME ### subscript: expr | [expr] ':' [expr] import sys, time c = sys.path[0] x = time.time() x = sys.modules['time'].time() a = '01234' c = a[0] c = a[-1] s = a[0:5] s = a[:5] s = a[0:] s = a[:] s = a[-5:] s = a[:-1] s = a[-4:-3] # A rough test of SF bug 1333982. http://python.org/sf/1333982 # The testing here is fairly incomplete. # Test cases should include: commas with 1 and 2 colons d = {} d[1] = 1 d[1,] = 2 d[1,2] = 3 d[1,2,3] = 4 L = list(d) L.sort(key=lambda x: x if isinstance(x, tuple) else ()) self.assertEquals(str(L), '[1, (1,), (1, 2), (1, 2, 3)]') def testAtoms(self): ### atom: '(' [testlist] ')' | '[' [testlist] ']' | '{' [dictsetmaker] '}' | NAME | NUMBER | STRING ### dictsetmaker: (test ':' test (',' test ':' test)* [',']) | (test (',' test)* [',']) x = (1) x = (1 or 2 or 3) x = (1 or 2 or 3, 2, 3) x = [] x = [1] x = [1 or 2 or 3] x = [1 or 2 or 3, 2, 3] x = [] x = {} x = {'one': 1} x = {'one': 1,} x = {'one' or 'two': 1 or 2} x = {'one': 1, 'two': 2} x = {'one': 1, 'two': 2,} x = {'one': 1, 'two': 2, 'three': 3, 'four': 4, 'five': 5, 'six': 6} x = {'one'} x = {'one', 1,} x = {'one', 'two', 'three'} x = {2, 3, 4,} x = x x = 'x' x = 123 ### exprlist: expr (',' expr)* [','] ### testlist: test (',' test)* [','] # These have been exercised enough above def testClassdef(self): # 'class' NAME ['(' [testlist] ')'] ':' suite class B: pass class B2(): pass class C1(B): pass class C2(B): pass class D(C1, C2, B): pass class C: def meth1(self): pass def meth2(self, arg): pass def meth3(self, a1, a2): pass # decorator: '@' dotted_name [ '(' [arglist] ')' ] NEWLINE # decorators: decorator+ # decorated: decorators (classdef | funcdef) def class_decorator(x): return x @class_decorator class G: pass def testDictcomps(self): # dictorsetmaker: ( (test ':' test (comp_for | # (',' test ':' test)* [','])) | # (test (comp_for | (',' test)* [','])) ) nums = [1, 2, 3] self.assertEqual({i:i+1 for i in nums}, {1: 2, 2: 3, 3: 4}) def testListcomps(self): # list comprehension tests nums = [1, 2, 3, 4, 5] strs = ["Apple", "Banana", "Coconut"] spcs = [" Apple", " Banana ", "Coco nut "] self.assertEqual([s.strip() for s in spcs], ['Apple', 'Banana', 'Coco nut']) self.assertEqual([3 * x for x in nums], [3, 6, 9, 12, 15]) self.assertEqual([x for x in nums if x > 2], [3, 4, 5]) self.assertEqual([(i, s) for i in nums for s in strs], [(1, 'Apple'), (1, 'Banana'), (1, 'Coconut'), (2, 'Apple'), (2, 'Banana'), (2, 'Coconut'), (3, 'Apple'), (3, 'Banana'), (3, 'Coconut'), (4, 'Apple'), (4, 'Banana'), (4, 'Coconut'), (5, 'Apple'), (5, 'Banana'), (5, 'Coconut')]) self.assertEqual([(i, s) for i in nums for s in [f for f in strs if "n" in f]], [(1, 'Banana'), (1, 'Coconut'), (2, 'Banana'), (2, 'Coconut'), (3, 'Banana'), (3, 'Coconut'), (4, 'Banana'), (4, 'Coconut'), (5, 'Banana'), (5, 'Coconut')]) self.assertEqual([(lambda a:[a**i for i in range(a+1)])(j) for j in range(5)], [[1], [1, 1], [1, 2, 4], [1, 3, 9, 27], [1, 4, 16, 64, 256]]) def test_in_func(l): return [0 < x < 3 for x in l if x > 2] self.assertEqual(test_in_func(nums), [False, False, False]) def test_nested_front(): self.assertEqual([[y for y in [x, x + 1]] for x in [1,3,5]], [[1, 2], [3, 4], [5, 6]]) test_nested_front() check_syntax_error(self, "[i, s for i in nums for s in strs]") check_syntax_error(self, "[x if y]") suppliers = [ (1, "Boeing"), (2, "Ford"), (3, "Macdonalds") ] parts = [ (10, "Airliner"), (20, "Engine"), (30, "Cheeseburger") ] suppart = [ (1, 10), (1, 20), (2, 20), (3, 30) ] x = [ (sname, pname) for (sno, sname) in suppliers for (pno, pname) in parts for (sp_sno, sp_pno) in suppart if sno == sp_sno and pno == sp_pno ] self.assertEqual(x, [('Boeing', 'Airliner'), ('Boeing', 'Engine'), ('Ford', 'Engine'), ('Macdonalds', 'Cheeseburger')]) def testGenexps(self): # generator expression tests g = ([x for x in range(10)] for x in range(1)) self.assertEqual(next(g), [x for x in range(10)]) try: next(g) self.fail('should produce StopIteration exception') except StopIteration: pass a = 1 try: g = (a for d in a) next(g) self.fail('should produce TypeError') except TypeError: pass self.assertEqual(list((x, y) for x in 'abcd' for y in 'abcd'), [(x, y) for x in 'abcd' for y in 'abcd']) self.assertEqual(list((x, y) for x in 'ab' for y in 'xy'), [(x, y) for x in 'ab' for y in 'xy']) a = [x for x in range(10)] b = (x for x in (y for y in a)) self.assertEqual(sum(b), sum([x for x in range(10)])) self.assertEqual(sum(x**2 for x in range(10)), sum([x**2 for x in range(10)])) self.assertEqual(sum(x*x for x in range(10) if x%2), sum([x*x for x in range(10) if x%2])) self.assertEqual(sum(x for x in (y for y in range(10))), sum([x for x in range(10)])) self.assertEqual(sum(x for x in (y for y in (z for z in range(10)))), sum([x for x in range(10)])) self.assertEqual(sum(x for x in [y for y in (z for z in range(10))]), sum([x for x in range(10)])) self.assertEqual(sum(x for x in (y for y in (z for z in range(10) if True)) if True), sum([x for x in range(10)])) self.assertEqual(sum(x for x in (y for y in (z for z in range(10) if True) if False) if True), 0) check_syntax_error(self, "foo(x for x in range(10), 100)") check_syntax_error(self, "foo(100, x for x in range(10))") def testComprehensionSpecials(self): # test for outmost iterable precomputation x = 10; g = (i for i in range(x)); x = 5 self.assertEqual(len(list(g)), 10) # This should hold, since we're only precomputing outmost iterable. x = 10; t = False; g = ((i,j) for i in range(x) if t for j in range(x)) x = 5; t = True; self.assertEqual([(i,j) for i in range(10) for j in range(5)], list(g)) # Grammar allows multiple adjacent 'if's in listcomps and genexps, # even though it's silly. Make sure it works (ifelse broke this.) self.assertEqual([ x for x in range(10) if x % 2 if x % 3 ], [1, 5, 7]) self.assertEqual(list(x for x in range(10) if x % 2 if x % 3), [1, 5, 7]) # verify unpacking single element tuples in listcomp/genexp. self.assertEqual([x for x, in [(4,), (5,), (6,)]], [4, 5, 6]) self.assertEqual(list(x for x, in [(7,), (8,), (9,)]), [7, 8, 9]) def test_with_statement(self): class manager(object): def __enter__(self): return (1, 2) def __exit__(self, *args): pass with manager(): pass with manager() as x: pass with manager() as (x, y): pass with manager(), manager(): pass with manager() as x, manager() as y: pass with manager() as x, manager(): pass def testIfElseExpr(self): # Test ifelse expressions in various cases def _checkeval(msg, ret): "helper to check that evaluation of expressions is done correctly" print(x) return ret # the next line is not allowed anymore #self.assertEqual([ x() for x in lambda: True, lambda: False if x() ], [True]) self.assertEqual([ x() for x in (lambda: True, lambda: False) if x() ], [True]) self.assertEqual([ x(False) for x in (lambda x: False if x else True, lambda x: True if x else False) if x(False) ], [True]) self.assertEqual((5 if 1 else _checkeval("check 1", 0)), 5) self.assertEqual((_checkeval("check 2", 0) if 0 else 5), 5) self.assertEqual((5 and 6 if 0 else 1), 1) self.assertEqual(((5 and 6) if 0 else 1), 1) self.assertEqual((5 and (6 if 1 else 1)), 6) self.assertEqual((0 or _checkeval("check 3", 2) if 0 else 3), 3) self.assertEqual((1 or _checkeval("check 4", 2) if 1 else _checkeval("check 5", 3)), 1) self.assertEqual((0 or 5 if 1 else _checkeval("check 6", 3)), 5) self.assertEqual((not 5 if 1 else 1), False) self.assertEqual((not 5 if 0 else 1), 1) self.assertEqual((6 + 1 if 1 else 2), 7) self.assertEqual((6 - 1 if 1 else 2), 5) self.assertEqual((6 * 2 if 1 else 4), 12) self.assertEqual((6 / 2 if 1 else 3), 3) self.assertEqual((6 < 4 if 0 else 2), 2) def test_main(): run_unittest(TokenTests, GrammarTests) if __name__ == '__main__': test_main()