我们从Python开源项目中，提取了以下42个代码示例，用于说明如何使用operator.lshift()。
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 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 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__(self, y): return NonStandardInteger(operator.lshift(self.val, y))
def __rlshift__(self, y): return NonStandardInteger(operator.lshift(y, self.val))
def __lshift__(self, other): return self._o2(other, operator.lshift)
def __rlshift__(self, other): return self._r_o2(other, operator.lshift)
def __lshift__(self, other): return _op2(self, other, operator.lshift)
def __rlshift__(self, other): return _op2(self, other, operator.lshift, rev=True)
def eval_BINARY_LSHIFT(self, instr): return self.binop(operator.lshift, instr)
def make_env(): ''' An environment with basic procedures. ''' import math import cmath import itertools import operator as op env = Environment() env.update(vars(math)) env.update(vars(cmath)) env.update(vars(itertools)) env.update({ '>': op.gt, '<': op.lt, '>=': op.ge, '<=': op.le, '=': op.eq, '>>': op.rshift, '<<': op.lshift, '+': lambda *x: reduce(op.add, x, 0), '-': lambda *x: x[0] - sum(x[1:]), '*': lambda *x: reduce(op.mul, x, 1), '/': lambda *x: reduce(op.truediv, (x[1:]), x[0]), '//': lambda *x: reduce(op.floordiv, (x[1:]), x[0]), '%': op.mod, 'abs': abs, 'append': op.add, 'apply': lambda proc,l: proc(*l), 'begin': lambda *x: x[-1], 'bool?': lambda x: isinstance(x, bool), 'call/cc': callcc, 'car': lambda x: x[0], 'cdr': lambda x: x[1:], 'cons': lambda x,y: [x] + y, 'filter': lambda f,l: list(filter(f, l)), 'length': len, 'list': lambda *x: list(x), 'list?': lambda x: isinstance(x,list), # Map can be defined in the stdlib, though it will max out python's recursion depth 'map': lambda f,l: list(map(f, l)), 'max': max, 'min': min, 'not': op.not_, 'number?': lambda x: not isinstance(x, bool) and isinstance(x, int) or isinstance(x, float) or isinstance(x, complex), 'or': op.or_, 'proc?': callable, 'range': lambda *x: list(range(x[0], x[1])) if len(x) > 1 else list(range(x[0])), 'round': round, 'str?': lambda x: isinstance(x, str), 'sum': lambda x: sum(x), }) return env # Create a global env for `gazeval()` to access
