Python Pocket Reference, 3rd Edition

Operator Overloading Methods

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63

__delitem__(self, key)

Invoked on del self[key]. This method is for index/key

component deletion.

As of Python 2.0, the following three methods are consid-

ered deprecated, but are still supported. They are called only

when a simple two-item slice with a single colon is used and

the slice method is defined. For slice operations involving

extended three-item slice notation, or in the absence of the

slice method,

__getitem__, __setitem__,or__delitem__ is

called instead, with a slice object as its argument.

__getslice__(self, low, high)

Invoked on self[low:high] for sequence slicing. This

format is considered deprecated as of Python 2.0.

If no

__getslice_ _

is found, or if an extended three-item slice

is used, then a slice object is created and is passed to the

__getitem_ _

method.

__setslice__(self, low, high, seq)

Invoked on self[low:high]=seq for sequence slice assign-

ment.

__delslice__(self, low, high)

Invoked on del self[low:high] for sequence slice dele-

tion.

For Numbers (Binary Operators)

Basic binary methods

__add__(self, other)

Invoked on self + other for numeric addition, or

sequence concatenation.

__sub__(self, other)

Invoked on self - other.

__mul__(self, other)

Invoked on self * other for numeric multiplication, or

sequence repetition.

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Python Pocket Reference

__div__(self, ...