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Revision dae5d728bc3f1d4039b64e4ec3a9036fd5d19587 authored by Miss Islington (bot) on 10 November 2020, 19:58:27 UTC, committed by GitHub on 10 November 2020, 19:58:27 UTC
Fix an assertion error in format() in debug build for floating point formatting with "n" format, zero padding and small width. Release build is not impacted. Patch by Karthikeyan Singaravelan. (cherry picked from commit 3f7983a25a3d19779283c707fbdd5bc91b1587ef) Co-authored-by: Xtreak <tir.karthi@gmail.com>
1 parent a63234c
Tip revision: dae5d728bc3f1d4039b64e4ec3a9036fd5d19587 authored by Miss Islington (bot) on 10 November 2020, 19:58:27 UTC
bpo-35560: Remove assertion from format(float, "n") (GH-11288) (GH-23231)
bpo-35560: Remove assertion from format(float, "n") (GH-11288) (GH-23231)
Tip revision: dae5d72
test_unpack_ex.py
# Tests for extended unpacking, starred expressions.
doctests = """
Unpack tuple
>>> t = (1, 2, 3)
>>> a, *b, c = t
>>> a == 1 and b == [2] and c == 3
True
Unpack list
>>> l = [4, 5, 6]
>>> a, *b = l
>>> a == 4 and b == [5, 6]
True
Unpack implied tuple
>>> *a, = 7, 8, 9
>>> a == [7, 8, 9]
True
Unpack string... fun!
>>> a, *b = 'one'
>>> a == 'o' and b == ['n', 'e']
True
Unpack long sequence
>>> a, b, c, *d, e, f, g = range(10)
>>> (a, b, c, d, e, f, g) == (0, 1, 2, [3, 4, 5, 6], 7, 8, 9)
True
Unpack short sequence
>>> a, *b, c = (1, 2)
>>> a == 1 and c == 2 and b == []
True
Unpack generic sequence
>>> class Seq:
... def __getitem__(self, i):
... if i >= 0 and i < 3: return i
... raise IndexError
...
>>> a, *b = Seq()
>>> a == 0 and b == [1, 2]
True
Unpack in for statement
>>> for a, *b, c in [(1,2,3), (4,5,6,7)]:
... print(a, b, c)
...
1 [2] 3
4 [5, 6] 7
Unpack in list
>>> [a, *b, c] = range(5)
>>> a == 0 and b == [1, 2, 3] and c == 4
True
Multiple targets
>>> a, *b, c = *d, e = range(5)
>>> a == 0 and b == [1, 2, 3] and c == 4 and d == [0, 1, 2, 3] and e == 4
True
Assignment unpacking
>>> a, b, *c = range(5)
>>> a, b, c
(0, 1, [2, 3, 4])
>>> *a, b, c = a, b, *c
>>> a, b, c
([0, 1, 2], 3, 4)
Set display element unpacking
>>> a = [1, 2, 3]
>>> sorted({1, *a, 0, 4})
[0, 1, 2, 3, 4]
>>> {1, *1, 0, 4}
Traceback (most recent call last):
...
TypeError: 'int' object is not iterable
Dict display element unpacking
>>> kwds = {'z': 0, 'w': 12}
>>> sorted({'x': 1, 'y': 2, **kwds}.items())
[('w', 12), ('x', 1), ('y', 2), ('z', 0)]
>>> sorted({**{'x': 1}, 'y': 2, **{'z': 3}}.items())
[('x', 1), ('y', 2), ('z', 3)]
>>> sorted({**{'x': 1}, 'y': 2, **{'x': 3}}.items())
[('x', 3), ('y', 2)]
>>> sorted({**{'x': 1}, **{'x': 3}, 'x': 4}.items())
[('x', 4)]
>>> {**{}}
{}
>>> a = {}
>>> {**a}[0] = 1
>>> a
{}
>>> {**1}
Traceback (most recent call last):
...
TypeError: 'int' object is not a mapping
>>> {**[]}
Traceback (most recent call last):
...
TypeError: 'list' object is not a mapping
>>> len(eval("{" + ", ".join("**{{{}: {}}}".format(i, i)
... for i in range(1000)) + "}"))
1000
>>> {0:1, **{0:2}, 0:3, 0:4}
{0: 4}
List comprehension element unpacking
>>> a, b, c = [0, 1, 2], 3, 4
>>> [*a, b, c]
[0, 1, 2, 3, 4]
>>> l = [a, (3, 4), {5}, {6: None}, (i for i in range(7, 10))]
>>> [*item for item in l]
Traceback (most recent call last):
...
SyntaxError: iterable unpacking cannot be used in comprehension
>>> [*[0, 1] for i in range(10)]
Traceback (most recent call last):
...
SyntaxError: iterable unpacking cannot be used in comprehension
>>> [*'a' for i in range(10)]
Traceback (most recent call last):
...
SyntaxError: iterable unpacking cannot be used in comprehension
>>> [*[] for i in range(10)]
Traceback (most recent call last):
...
SyntaxError: iterable unpacking cannot be used in comprehension
Generator expression in function arguments
>>> list(*x for x in (range(5) for i in range(3)))
Traceback (most recent call last):
...
list(*x for x in (range(5) for i in range(3)))
^
SyntaxError: invalid syntax
>>> dict(**x for x in [{1:2}])
Traceback (most recent call last):
...
dict(**x for x in [{1:2}])
^
SyntaxError: invalid syntax
Iterable argument unpacking
>>> print(*[1], *[2], 3)
1 2 3
Make sure that they don't corrupt the passed-in dicts.
>>> def f(x, y):
... print(x, y)
...
>>> original_dict = {'x': 1}
>>> f(**original_dict, y=2)
1 2
>>> original_dict
{'x': 1}
Now for some failures
Make sure the raised errors are right for keyword argument unpackings
>>> from collections.abc import MutableMapping
>>> class CrazyDict(MutableMapping):
... def __init__(self):
... self.d = {}
...
... def __iter__(self):
... for x in self.d.__iter__():
... if x == 'c':
... self.d['z'] = 10
... yield x
...
... def __getitem__(self, k):
... return self.d[k]
...
... def __len__(self):
... return len(self.d)
...
... def __setitem__(self, k, v):
... self.d[k] = v
...
... def __delitem__(self, k):
... del self.d[k]
...
>>> d = CrazyDict()
>>> d.d = {chr(ord('a') + x): x for x in range(5)}
>>> e = {**d}
Traceback (most recent call last):
...
RuntimeError: dictionary changed size during iteration
>>> d.d = {chr(ord('a') + x): x for x in range(5)}
>>> def f(**kwargs): print(kwargs)
>>> f(**d)
Traceback (most recent call last):
...
RuntimeError: dictionary changed size during iteration
Overridden parameters
>>> f(x=5, **{'x': 3}, y=2)
Traceback (most recent call last):
...
TypeError: f() got multiple values for keyword argument 'x'
>>> f(**{'x': 3}, x=5, y=2)
Traceback (most recent call last):
...
TypeError: f() got multiple values for keyword argument 'x'
>>> f(**{'x': 3}, **{'x': 5}, y=2)
Traceback (most recent call last):
...
TypeError: f() got multiple values for keyword argument 'x'
>>> f(x=5, **{'x': 3}, **{'x': 2})
Traceback (most recent call last):
...
TypeError: f() got multiple values for keyword argument 'x'
>>> f(**{1: 3}, **{1: 5})
Traceback (most recent call last):
...
TypeError: f() keywords must be strings
Unpacking non-sequence
>>> a, *b = 7
Traceback (most recent call last):
...
TypeError: 'int' object is not iterable
Unpacking sequence too short
>>> a, *b, c, d, e = Seq()
Traceback (most recent call last):
...
ValueError: not enough values to unpack (expected at least 4, got 3)
Unpacking sequence too short and target appears last
>>> a, b, c, d, *e = Seq()
Traceback (most recent call last):
...
ValueError: not enough values to unpack (expected at least 4, got 3)
Unpacking a sequence where the test for too long raises a different kind of
error
>>> class BozoError(Exception):
... pass
...
>>> class BadSeq:
... def __getitem__(self, i):
... if i >= 0 and i < 3:
... return i
... elif i == 3:
... raise BozoError
... else:
... raise IndexError
...
Trigger code while not expecting an IndexError (unpack sequence too long, wrong
error)
>>> a, *b, c, d, e = BadSeq()
Traceback (most recent call last):
...
test.test_unpack_ex.BozoError
Now some general starred expressions (all fail).
>>> a, *b, c, *d, e = range(10) # doctest:+ELLIPSIS
Traceback (most recent call last):
...
SyntaxError: two starred expressions in assignment
>>> [*b, *c] = range(10) # doctest:+ELLIPSIS
Traceback (most recent call last):
...
SyntaxError: two starred expressions in assignment
>>> *a = range(10) # doctest:+ELLIPSIS
Traceback (most recent call last):
...
SyntaxError: starred assignment target must be in a list or tuple
>>> *a # doctest:+ELLIPSIS
Traceback (most recent call last):
...
SyntaxError: can't use starred expression here
>>> *1 # doctest:+ELLIPSIS
Traceback (most recent call last):
...
SyntaxError: can't use starred expression here
>>> x = *a # doctest:+ELLIPSIS
Traceback (most recent call last):
...
SyntaxError: can't use starred expression here
Some size constraints (all fail.)
>>> s = ", ".join("a%d" % i for i in range(1<<8)) + ", *rest = range(1<<8 + 1)"
>>> compile(s, 'test', 'exec') # doctest:+ELLIPSIS
Traceback (most recent call last):
...
SyntaxError: too many expressions in star-unpacking assignment
>>> s = ", ".join("a%d" % i for i in range(1<<8 + 1)) + ", *rest = range(1<<8 + 2)"
>>> compile(s, 'test', 'exec') # doctest:+ELLIPSIS
Traceback (most recent call last):
...
SyntaxError: too many expressions in star-unpacking assignment
(there is an additional limit, on the number of expressions after the
'*rest', but it's 1<<24 and testing it takes too much memory.)
"""
__test__ = {'doctests' : doctests}
def test_main(verbose=False):
from test import support
from test import test_unpack_ex
support.run_doctest(test_unpack_ex, verbose)
if __name__ == "__main__":
test_main(verbose=True)
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