cpython/Lib/operator.py at 8f8ec92de85b40b9e7bec81ae87f18cc3996c560 · python/cpython · GitHub

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"""

Operator Interface

This module exports a set of functions corresponding to the intrinsic

operators of Python. For example, operator.add(x, y) is equivalent

to the expression x+y. The function names are those used for special

methods; variants without leading and trailing '__' are also provided

for convenience.

This is the pure Python implementation of the module.

"""

__all__ = ['abs', 'add', 'and_', 'attrgetter', 'concat', 'contains', 'countOf',

'delitem', 'eq', 'floordiv', 'ge', 'getitem', 'gt', 'iadd', 'iand',

'iconcat', 'ifloordiv', 'ilshift', 'imod', 'imul', 'index',

'indexOf', 'inv', 'invert', 'ior', 'ipow', 'irshift', 'is_',

'is_not', 'isub', 'itemgetter', 'itruediv', 'ixor', 'le',

'length_hint', 'lshift', 'lt', 'methodcaller', 'mod', 'mul', 'ne',

'neg', 'not_', 'or_', 'pos', 'pow', 'rshift', 'setitem', 'sub',

'truediv', 'truth', 'xor']

from builtins import abs as _abs

# Comparison Operations *******************************************************#

def lt(a, b):

"Same as a < b."

return a < b

def le(a, b):

"Same as a <= b."

return a <= b

def eq(a, b):

"Same as a == b."

return a == b

def ne(a, b):

"Same as a != b."

return a != b

def ge(a, b):

"Same as a >= b."

return a >= b

def gt(a, b):

"Same as a > b."

return a > b

# Logical Operations **********************************************************#

def not_(a):

"Same as not a."

return not a

def truth(a):

"Return True if a is true, False otherwise."

return True if a else False

def is_(a, b):

"Same as a is b."

return a is b

def is_not(a, b):

"Same as a is not b."

return a is not b

# Mathematical/Bitwise Operations *********************************************#

def abs(a):

"Same as abs(a)."

return _abs(a)

def add(a, b):

"Same as a + b."

return a + b

def and_(a, b):

"Same as a & b."

return a & b

def floordiv(a, b):

"Same as a // b."

return a // b

def index(a):

"Same as a.__index__()."

return a.__index__()

def inv(a):

"Same as ~a."

return ~a

invert = inv

def lshift(a, b):

"Same as a << b."

return a << b

def mod(a, b):

"Same as a % b."

return a % b

def mul(a, b):

"Same as a * b."

return a * b

def neg(a):

"Same as -a."

return -a

def or_(a, b):

"Same as a | b."

return a | b

def pos(a):

"Same as +a."

return +a

def pow(a, b):

"Same as a ** b."

return a ** b

def rshift(a, b):

"Same as a >> b."

return a >> b

def sub(a, b):

"Same as a - b."

return a - b

def truediv(a, b):

"Same as a / b."

return a / b

def xor(a, b):

"Same as a ^ b."

return a ^ b

# Sequence Operations *********************************************************#

def concat(a, b):

"Same as a + b, for a and b sequences."

if not hasattr(a, '__getitem__'):

msg = "'%s' object can't be concatenated" % type(a).__name__

raise TypeError(msg)

return a + b

def contains(a, b):

"Same as b in a (note reversed operands)."

return b in a

def countOf(a, b):

"Return the number of times b occurs in a."

count = 0

for i in a:

if i == b:

count += 1

return count

def delitem(a, b):

"Same as del a[b]."

del a[b]

def getitem(a, b):

"Same as a[b]."

return a[b]

def indexOf(a, b):

"Return the first index of b in a."

for i, j in enumerate(a):

if j == b:

return i

else:

raise ValueError('sequence.index(x): x not in sequence')

def setitem(a, b, c):

"Same as a[b] = c."

a[b] = c

def length_hint(obj, default=0):

"""

Return an estimate of the number of items in obj.

This is useful for presizing containers when building from an iterable.

If the object supports len(), the result will be exact. Otherwise, it may

over- or under-estimate by an arbitrary amount. The result will be an

integer >= 0.

"""

if not isinstance(default, int):

msg = ("'%s' object cannot be interpreted as an integer" %

type(default).__name__)

raise TypeError(msg)

try:

return len(obj)

except TypeError:

pass

try:

hint = type(obj).__length_hint__

except AttributeError:

return default

try:

val = hint(obj)

except TypeError:

return default

if val is NotImplemented:

return default

if not isinstance(val, int):

msg = ('__length_hint__ must be integer, not %s' %

type(val).__name__)

raise TypeError(msg)

if val < 0:

msg = '__length_hint__() should return >= 0'

raise ValueError(msg)

return val

# Generalized Lookup Objects **************************************************#

class attrgetter:

"""

Return a callable object that fetches the given attribute(s) from its operand.

After f = attrgetter('name'), the call f(r) returns r.name.

After g = attrgetter('name', 'date'), the call g(r) returns (r.name, r.date).

After h = attrgetter('name.first', 'name.last'), the call h(r) returns

(r.name.first, r.name.last).

"""

def __init__(self, attr, *attrs):

if not attrs:

if not isinstance(attr, str):

raise TypeError('attribute name must be a string')

names = attr.split('.')

def func(obj):

for name in names:

obj = getattr(obj, name)

return obj

self._call = func

else:

getters = tuple(map(attrgetter, (attr,) + attrs))

def func(obj):

return tuple(getter(obj) for getter in getters)

self._call = func

def __call__(self, obj):

return self._call(obj)

class itemgetter:

"""

Return a callable object that fetches the given item(s) from its operand.

After f = itemgetter(2), the call f(r) returns r[2].

After g = itemgetter(2, 5, 3), the call g(r) returns (r[2], r[5], r[3])

"""

def __init__(self, item, *items):

if not items:

def func(obj):

return obj[item]

self._call = func

else:

items = (item,) + items

def func(obj):

return tuple(obj[i] for i in items)

self._call = func

def __call__(self, obj):

return self._call(obj)

class methodcaller:

"""

Return a callable object that calls the given method on its operand.

After f = methodcaller('name'), the call f(r) returns r.name().

After g = methodcaller('name', 'date', foo=1), the call g(r) returns

r.name('date', foo=1).

"""

def __init__(*args, **kwargs):

if len(args) < 2:

msg = "methodcaller needs at least one argument, the method name"

raise TypeError(msg)

self = args[0]

self._name = args[1]

self._args = args[2:]

self._kwargs = kwargs

def __call__(self, obj):

return getattr(obj, self._name)(*self._args, **self._kwargs)

# In-place Operations *********************************************************#

def iadd(a, b):

"Same as a += b."

a += b

return a

def iand(a, b):

"Same as a &= b."

a &= b

return a

def iconcat(a, b):

"Same as a += b, for a and b sequences."

if not hasattr(a, '__getitem__'):

msg = "'%s' object can't be concatenated" % type(a).__name__

raise TypeError(msg)

a += b

return a

def ifloordiv(a, b):

"Same as a //= b."

a //= b

return a

def ilshift(a, b):

"Same as a <<= b."

a <<= b

return a

def imod(a, b):

"Same as a %= b."

a %= b

return a

def imul(a, b):

"Same as a *= b."

a *= b

return a

def ior(a, b):

"Same as a |= b."

a |= b

return a

def ipow(a, b):

"Same as a **= b."

a **=b

return a

def irshift(a, b):

"Same as a >>= b."

a >>= b

return a

def isub(a, b):

"Same as a -= b."

a -= b

return a

def itruediv(a, b):

"Same as a /= b."

a /= b

return a

def ixor(a, b):

"Same as a ^= b."

a ^= b

return a

try:

from _operator import *

except ImportError:

pass

else:

from _operator import __doc__

# All of these "__func__ = func" assignments have to happen after importing

# from _operator to make sure they're set to the right function

__lt__ = lt

__le__ = le

__eq__ = eq

__ne__ = ne

__ge__ = ge

__gt__ = gt

__not__ = not_

__abs__ = abs

__add__ = add

__and__ = and_

__floordiv__ = floordiv

__index__ = index

__inv__ = inv

__invert__ = invert

__lshift__ = lshift

__mod__ = mod

__mul__ = mul

__neg__ = neg

__or__ = or_

__pos__ = pos

__pow__ = pow

__rshift__ = rshift

__sub__ = sub

__truediv__ = truediv

__xor__ = xor

__concat__ = concat

__contains__ = contains

__delitem__ = delitem

__getitem__ = getitem

__setitem__ = setitem

__iadd__ = iadd

__iand__ = iand

__iconcat__ = iconcat

__ifloordiv__ = ifloordiv

__ilshift__ = ilshift

__imod__ = imod

__imul__ = imul

__ior__ = ior

__ipow__ = ipow

__irshift__ = irshift

__isub__ = isub

__itruediv__ = itruediv

__ixor__ = ixor

cpython/Lib/operator.py at 8f8ec92de85b40b9e7bec81ae87f18cc3996c560 · python/cpython · GitHub

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