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Diffstat (limited to 'lib/python2.7/test/test_genexps.py')
-rw-r--r-- | lib/python2.7/test/test_genexps.py | 283 |
1 files changed, 0 insertions, 283 deletions
diff --git a/lib/python2.7/test/test_genexps.py b/lib/python2.7/test/test_genexps.py deleted file mode 100644 index fc593a3..0000000 --- a/lib/python2.7/test/test_genexps.py +++ /dev/null @@ -1,283 +0,0 @@ -doctests = """ - -Test simple loop with conditional - - >>> sum(i*i for i in range(100) if i&1 == 1) - 166650 - -Test simple nesting - - >>> list((i,j) for i in range(3) for j in range(4) ) - [(0, 0), (0, 1), (0, 2), (0, 3), (1, 0), (1, 1), (1, 2), (1, 3), (2, 0), (2, 1), (2, 2), (2, 3)] - -Test nesting with the inner expression dependent on the outer - - >>> list((i,j) for i in range(4) for j in range(i) ) - [(1, 0), (2, 0), (2, 1), (3, 0), (3, 1), (3, 2)] - -Make sure the induction variable is not exposed - - >>> i = 20 - >>> sum(i*i for i in range(100)) - 328350 - >>> i - 20 - -Test first class - - >>> g = (i*i for i in range(4)) - >>> type(g) - <type 'generator'> - >>> list(g) - [0, 1, 4, 9] - -Test direct calls to next() - - >>> g = (i*i for i in range(3)) - >>> g.next() - 0 - >>> g.next() - 1 - >>> g.next() - 4 - >>> g.next() - Traceback (most recent call last): - File "<pyshell#21>", line 1, in -toplevel- - g.next() - StopIteration - -Does it stay stopped? - - >>> g.next() - Traceback (most recent call last): - File "<pyshell#21>", line 1, in -toplevel- - g.next() - StopIteration - >>> list(g) - [] - -Test running gen when defining function is out of scope - - >>> def f(n): - ... return (i*i for i in xrange(n)) - >>> list(f(10)) - [0, 1, 4, 9, 16, 25, 36, 49, 64, 81] - - >>> def f(n): - ... return ((i,j) for i in xrange(3) for j in xrange(n)) - >>> list(f(4)) - [(0, 0), (0, 1), (0, 2), (0, 3), (1, 0), (1, 1), (1, 2), (1, 3), (2, 0), (2, 1), (2, 2), (2, 3)] - >>> def f(n): - ... return ((i,j) for i in xrange(3) for j in xrange(4) if j in xrange(n)) - >>> list(f(4)) - [(0, 0), (0, 1), (0, 2), (0, 3), (1, 0), (1, 1), (1, 2), (1, 3), (2, 0), (2, 1), (2, 2), (2, 3)] - >>> list(f(2)) - [(0, 0), (0, 1), (1, 0), (1, 1), (2, 0), (2, 1)] - -Verify that parenthesis are required in a statement - - >>> def f(n): - ... return i*i for i in xrange(n) - Traceback (most recent call last): - ... - SyntaxError: invalid syntax - -Verify that parenthesis are required when used as a keyword argument value - - >>> dict(a = i for i in xrange(10)) - Traceback (most recent call last): - ... - SyntaxError: invalid syntax - -Verify that parenthesis are required when used as a keyword argument value - - >>> dict(a = (i for i in xrange(10))) #doctest: +ELLIPSIS - {'a': <generator object <genexpr> at ...>} - -Verify early binding for the outermost for-expression - - >>> x=10 - >>> g = (i*i for i in range(x)) - >>> x = 5 - >>> list(g) - [0, 1, 4, 9, 16, 25, 36, 49, 64, 81] - -Verify that the outermost for-expression makes an immediate check -for iterability - - >>> (i for i in 6) - Traceback (most recent call last): - File "<pyshell#4>", line 1, in -toplevel- - (i for i in 6) - TypeError: 'int' object is not iterable - -Verify late binding for the outermost if-expression - - >>> include = (2,4,6,8) - >>> g = (i*i for i in range(10) if i in include) - >>> include = (1,3,5,7,9) - >>> list(g) - [1, 9, 25, 49, 81] - -Verify late binding for the innermost for-expression - - >>> g = ((i,j) for i in range(3) for j in range(x)) - >>> x = 4 - >>> list(g) - [(0, 0), (0, 1), (0, 2), (0, 3), (1, 0), (1, 1), (1, 2), (1, 3), (2, 0), (2, 1), (2, 2), (2, 3)] - -Verify re-use of tuples (a side benefit of using genexps over listcomps) - - >>> tupleids = map(id, ((i,i) for i in xrange(10))) - >>> int(max(tupleids) - min(tupleids)) - 0 - -Verify that syntax error's are raised for genexps used as lvalues - - >>> (y for y in (1,2)) = 10 - Traceback (most recent call last): - ... - File "<doctest test.test_genexps.__test__.doctests[40]>", line 1 - SyntaxError: can't assign to generator expression - - >>> (y for y in (1,2)) += 10 - Traceback (most recent call last): - ... - File "<doctest test.test_genexps.__test__.doctests[41]>", line 1 - SyntaxError: can't assign to generator expression - - -########### Tests borrowed from or inspired by test_generators.py ############ - -Make a generator that acts like range() - - >>> yrange = lambda n: (i for i in xrange(n)) - >>> list(yrange(10)) - [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] - -Generators always return to the most recent caller: - - >>> def creator(): - ... r = yrange(5) - ... print "creator", r.next() - ... return r - >>> def caller(): - ... r = creator() - ... for i in r: - ... print "caller", i - >>> caller() - creator 0 - caller 1 - caller 2 - caller 3 - caller 4 - -Generators can call other generators: - - >>> def zrange(n): - ... for i in yrange(n): - ... yield i - >>> list(zrange(5)) - [0, 1, 2, 3, 4] - - -Verify that a gen exp cannot be resumed while it is actively running: - - >>> g = (me.next() for i in xrange(10)) - >>> me = g - >>> me.next() - Traceback (most recent call last): - File "<pyshell#30>", line 1, in -toplevel- - me.next() - File "<pyshell#28>", line 1, in <generator expression> - g = (me.next() for i in xrange(10)) - ValueError: generator already executing - -Verify exception propagation - - >>> g = (10 // i for i in (5, 0, 2)) - >>> g.next() - 2 - >>> g.next() - Traceback (most recent call last): - File "<pyshell#37>", line 1, in -toplevel- - g.next() - File "<pyshell#35>", line 1, in <generator expression> - g = (10 // i for i in (5, 0, 2)) - ZeroDivisionError: integer division or modulo by zero - >>> g.next() - Traceback (most recent call last): - File "<pyshell#38>", line 1, in -toplevel- - g.next() - StopIteration - -Make sure that None is a valid return value - - >>> list(None for i in xrange(10)) - [None, None, None, None, None, None, None, None, None, None] - -Check that generator attributes are present - - >>> g = (i*i for i in range(3)) - >>> expected = set(['gi_frame', 'gi_running', 'next']) - >>> set(attr for attr in dir(g) if not attr.startswith('__')) >= expected - True - - >>> from test.test_support import HAVE_DOCSTRINGS - >>> print(g.next.__doc__ if HAVE_DOCSTRINGS else 'x.next() -> the next value, or raise StopIteration') - x.next() -> the next value, or raise StopIteration - >>> import types - >>> isinstance(g, types.GeneratorType) - True - -Check the __iter__ slot is defined to return self - - >>> iter(g) is g - True - -Verify that the running flag is set properly - - >>> g = (me.gi_running for i in (0,1)) - >>> me = g - >>> me.gi_running - 0 - >>> me.next() - 1 - >>> me.gi_running - 0 - -Verify that genexps are weakly referencable - - >>> import weakref - >>> g = (i*i for i in range(4)) - >>> wr = weakref.ref(g) - >>> wr() is g - True - >>> p = weakref.proxy(g) - >>> list(p) - [0, 1, 4, 9] - - -""" - - -__test__ = {'doctests' : doctests} - -def test_main(verbose=None): - import sys - from test import test_support - from test import test_genexps - test_support.run_doctest(test_genexps, verbose) - - # verify reference counting - if verbose and hasattr(sys, "gettotalrefcount"): - import gc - counts = [None] * 5 - for i in xrange(len(counts)): - test_support.run_doctest(test_genexps, verbose) - gc.collect() - counts[i] = sys.gettotalrefcount() - print counts - -if __name__ == "__main__": - test_main(verbose=True) |