Operators

The Python operator module [0] contains a large variety of operators and iteration_utilities only tries to fill in some missing ones:

Reverse arithmetic operators

Function

Equivalent

radd()

lambda x, y: y + x

rsub()

lambda x, y: y - x

rmul()

lambda x, y: y * x

rdiv()

lambda x, y: y / x

rfdiv()

lambda x, y: y // x

rpow()

lambda x, y: y ** x

rmod()

lambda x, y: y % x

Math operators

And of course the standard operators from the operator module:

Function

Equivalent

operator.add() (iadd)

lambda x, y: x + y

operator.sub() (isub)

lambda x, y: x - y

operator.mul() (imul)

lambda x, y: x * y

operator.truediv() (itruediv)

lambda x, y: x / y

operator.floordiv() (ifloordiv)

lambda x, y: x // y

operator.pow() (ipow)

lambda x, y: x ** y

operator.mod() (imod)

lambda x, y: x % y

operator.matmul() (imatmul)

lambda x, y: x @ y

operator.abs()

lambda x: abs(x)

operator.pos()

lambda x: +x

operator.neg()

lambda x: -x

And the bitwise operators:

Function

Equivalent

operator.lshift() (ilshift)

lambda x, y: x << y

operator.rshift() (irshift)

lambda x, y: x >> y

operator.and_() (iand)

lambda x, y: x & y

operator.or_() (ior)

lambda x, y: x | y

operator.xor() (ixor)

lambda x, y: x ^ y

operator.inv()

lambda x: ~x

Note

The math module contains several more!

Comparison operators

  • is_even(), equivalent to lambda x: (x % 2) == 0.

  • is_odd(), equivalent to lambda x: (x % 2) != 0.

  • is_None(), equivalent to lambda x: x is None.

  • is_not_None(), equivalent to lambda x: x is not None.

  • is_iterable(), roughly equivalent to lambda x: isinstance(x, collections.Iterable).

And the comparison operators from the Python library:

Function

Equivalent

operator.lt()

lambda x, y: x < y

operator.le()

lambda x, y: x <= y

operator.eq()

lambda x, y: x == y

operator.ne()

lambda x, y: x |= y

operator.ge()

lambda x, y: x >= y

operator.gt()

lambda x, y: x < y

operator.is_()

lambda x, y: x is y

operator.is_not()

lambda x, y: x is not y

operator.truth()

lambda x: not not x

operator.not_()

lambda x: not x

Misc

And some misc operators

Function

Equivalent

operator.index() *

lambda x: x__index__()

operator.concat() (iconcat) *

lambda x, y: x + y

operator.contains()

lambda x, y: y in x

operator.countOf() *

lambda x, y: y.count(x)

operator.indexOf() *

lambda x, y: y.index(x)

operator.getitem()

lambda x, y: x[y]

operator.setitem()

lambda x, y, z: x[y] = z

operator.delitem()

lambda x, y: del x[y]

operator.itemgetter() *

lambda x, lambda y: y[x]

operator.attrgetter() *

lambda x, lambda y: y.x

operator.methodcaller() *

lambda x, lambda y: y.x()

operator.length_hint() *

lambda x, y: len(x) or x.__length_hint__() or y

Marked (*) functions only have a rough equivalent and may be more sophisticated!

References