def __init__(self, code, objects=None):
self._OPERATORS = [
('|', operator.or_),
('^', operator.xor),
('&', operator.and_),
('>>', operator.rshift),
('<<', operator.lshift),
('-', operator.sub),
('+', operator.add),
('%', operator.mod),
('/', operator.truediv),
('*', operator.mul),
]
self._ASSIGN_OPERATORS = [(op + '=', opfunc)
for op, opfunc in self._OPERATORS]
self._ASSIGN_OPERATORS.append(('=', lambda cur, right: right))
self._VARNAME_PATTERN = r'[a-zA-Z_$][a-zA-Z_$0-9]*'
if objects is None:
objects = {}
self.code = code
self._functions = {}
self._objects = objects
python类lshift()的实例源码
def number_of_args(fn):
"""Return the number of positional arguments for a function, or None if the number is variable.
Looks inside any decorated functions."""
try:
if hasattr(fn, '__wrapped__'):
return number_of_args(fn.__wrapped__)
if any(p.kind == p.VAR_POSITIONAL for p in signature(fn).parameters.values()):
return None
else:
return sum(p.kind in (p.POSITIONAL_ONLY, p.POSITIONAL_OR_KEYWORD) for p in signature(fn).parameters.values())
except ValueError:
# signatures don't work for built-in operators, so check for a few explicitly
UNARY_OPS = [len, op.not_, op.truth, op.abs, op.index, op.inv, op.invert, op.neg, op.pos]
BINARY_OPS = [op.lt, op.le, op.gt, op.ge, op.eq, op.ne, op.is_, op.is_not, op.add, op.and_, op.floordiv, op.lshift, op.mod, op.mul, op.or_, op.pow, op.rshift, op.sub, op.truediv, op.xor, op.concat, op.contains, op.countOf, op.delitem, op.getitem, op.indexOf]
TERNARY_OPS = [op.setitem]
if fn in UNARY_OPS:
return 1
elif fn in BINARY_OPS:
return 2
elif fn in TERNARY_OPS:
return 3
else:
raise NotImplementedError("Bult-in operator {} not supported".format(fn))
def __init__(self, code, objects=None):
self._OPERATORS = [
('|', operator.or_),
('^', operator.xor),
('&', operator.and_),
('>>', operator.rshift),
('<<', operator.lshift),
('-', operator.sub),
('+', operator.add),
('%', operator.mod),
('/', operator.truediv),
('*', operator.mul),
]
self._ASSIGN_OPERATORS = [(op + '=', opfunc)
for op, opfunc in self._OPERATORS]
self._ASSIGN_OPERATORS.append(('=', lambda cur, right: right))
self._VARNAME_PATTERN = r'[a-zA-Z_$][a-zA-Z_$0-9]*'
if objects is None:
objects = {}
self.code = code
self._functions = {}
self._objects = objects
def set_bit_order(self, order):
"""Set order of bits to be read/written over serial lines. Should be
either MSBFIRST for most-significant first, or LSBFIRST for
least-signifcant first.
"""
# Set self._mask to the bitmask which points at the appropriate bit to
# read or write, and appropriate left/right shift operator function for
# reading/writing.
if order == MSBFIRST:
self._mask = 0x80
self._write_shift = operator.lshift
self._read_shift = operator.rshift
elif order == LSBFIRST:
self._mask = 0x01
self._write_shift = operator.rshift
self._read_shift = operator.lshift
else:
raise ValueError('Order must be MSBFIRST or LSBFIRST.')
def __lshift__(self, trc):
return self.apply_op2(trc, operator.lshift)
def test_lshift_scalar(self):
self.check_array_scalar_op(operator.lshift)
def test_rlshift_scalar(self):
self.check_array_scalar_op(operator.lshift, swap=True)
def test_lshift_scalarzero(self):
self.check_array_scalarzero_op(operator.lshift)
def test_rlshift_scalarzero(self):
self.check_array_scalarzero_op(operator.lshift, swap=True)
def test_lshift_array(self):
self.check_array_array_op(operator.lshift)
def test_doubly_broadcasted_lshift(self):
self.check_array_doubly_broadcasted_op(operator.lshift)
def lshift(x, n):
"""For an integer x, calculate x << n. Unlike the plain Python
expression (x << n), n is allowed to be negative, in which case a
right shift with default (floor) rounding is performed."""
if n >= 0: return x << n
else: return x >> (-n)
def test_lshift(self):
self.assertRaises(TypeError, operator.lshift)
self.assertRaises(TypeError, operator.lshift, None, 42)
self.assertTrue(operator.lshift(5, 1) == 10)
self.assertTrue(operator.lshift(5, 0) == 5)
self.assertRaises(ValueError, operator.lshift, 2, -1)
def lshift(x, n):
"""For an integer x, calculate x << n. Unlike the plain Python
expression (x << n), n is allowed to be negative, in which case a
right shift with default (floor) rounding is performed."""
if n >= 0: return x << n
else: return x >> (-n)
def __lshift__(self, y):
return NonStandardInteger(operator.lshift(self.val, y))
def __rlshift__(self, y):
return NonStandardInteger(operator.lshift(y, self.val))
def lshift(x, n):
"""For an integer x, calculate x << n. Unlike the plain Python
expression (x << n), n is allowed to be negative, in which case a
right shift with default (floor) rounding is performed."""
if n >= 0: return x << n
else: return x >> (-n)
def test_lshift(self):
self.assertRaises(TypeError, operator.lshift)
self.assertRaises(TypeError, operator.lshift, None, 42)
self.assertTrue(operator.lshift(5, 1) == 10)
self.assertTrue(operator.lshift(5, 0) == 5)
self.assertRaises(ValueError, operator.lshift, 2, -1)
def test_lshift(self):
self.assertRaises(TypeError, operator.lshift)
self.assertRaises(TypeError, operator.lshift, None, 42)
self.assertTrue(operator.lshift(5, 1) == 10)
self.assertTrue(operator.lshift(5, 0) == 5)
self.assertRaises(ValueError, operator.lshift, 2, -1)
def test_lshift_scalar(self):
self.check_array_scalar_op(operator.lshift)
def test_rlshift_scalar(self):
self.check_array_scalar_op(operator.lshift, swap=True)
def test_lshift_scalarzero(self):
self.check_array_scalarzero_op(operator.lshift)
def test_rlshift_scalarzero(self):
self.check_array_scalarzero_op(operator.lshift, swap=True)
def test_lshift_array(self):
self.check_array_array_op(operator.lshift)
def test_doubly_broadcasted_lshift(self):
self.check_array_doubly_broadcasted_op(operator.lshift)
def __lshift__(self, y):
return NonStandardInteger(operator.lshift(self.val, y))
def __rlshift__(self, y):
return NonStandardInteger(operator.lshift(y, self.val))
def test_lshift(self):
self.assertRaises(TypeError, operator.lshift)
self.assertRaises(TypeError, operator.lshift, None, 42)
self.assertTrue(operator.lshift(5, 1) == 10)
self.assertTrue(operator.lshift(5, 0) == 5)
self.assertRaises(ValueError, operator.lshift, 2, -1)
def __lshift__(self, other):
return self._o2(other, operator.lshift)
def __rlshift__(self, other):
return self._r_o2(other, operator.lshift)
