Anaconda Enterprise: Documentation

# Special Methods Table

This table lists all of the special methods together with their parameter and return types. In the table below, a parameter name of self is used to indicate that the parameter has the type that the method belongs to. Other parameters with no type specified in the table are generic Python objects.

You don’t have to declare your method as taking these parameter types. If you declare different types, conversions will be performed as necessary.

## General

Name | Parameters | Return type | Description
--- | --- | --- | ---
__cinit__ | self, ... |  | Basic initialisation (no direct Python equivalent)
__init__ | self, ... |  | Further initialisation
__dealloc__ | self |  | Basic deallocation (no direct Python equivalent)
__cmp__ | x, y | int | 3-way comparison
__richcmp__ | x, y, int op | object | Rich comparison (no direct Python equivalent)
__str__ | self | object | str(self)
__repr__ | self | object | repr(self)
__hash__ | self | int | Hash function
__call__ | self, ... | object | self(...)
__iter__ | self | object | Return iterator for sequence
__getattr__ | self, name | object | Get attribute
__getattribute__ | self, name | object | Get attribute, unconditionally
__setattr__ | self, name, val |  | Set attribute
__delattr__ | self, name |  | Delete attribute

## Arithmetic operators

Name | Parameters | Return type | Description
--- | --- | --- | ---
__add__ | x, y | object | binary + operator
__sub__ | x, y | object | binary - operator
__mul__ | x, y | object | * operator
__div__ | x, y | object | / operator for old-style division
__floordiv__ | x, y | object | // operator
__truediv__ | x, y | object | / operator for new-style division
__mod__ | x, y | object | % operator
__divmod__ | x, y | object | combined div and mod
__pow__ | x, y, z | object | ** operator or pow(x, y, z)
__neg__ | self | object | unary - operator
__pos__ | self | object | unary + operator
__abs__ | self | object | absolute value
__nonzero__ | self | int | convert to boolean
__invert__ | self | object | ~ operator
__lshift__ | x, y | object | << operator
__rshift__ | x, y | object | >> operator
__and__ | x, y | object | & operator
__or__ | x, y | object | | operator
__xor__ | x, y | object | ^ operator

## Numeric conversions

Name | Parameters | Return type | Description
--- | --- | --- | ---
__int__ | self | object | Convert to integer
__long__ | self | object | Convert to long integer
__float__ | self | object | Convert to float
__oct__ | self | object | Convert to octal
__hex__ | self | object | Convert to hexadecimal
__index__ | self | object | Convert to sequence index

## In-place arithmetic operators

Name | Parameters | Return type | Description
--- | --- | --- | ---
__iadd__ | self, x | object | += operator
__isub__ | self, x | object | -= operator
__imul__ | self, x | object | *= operator
__idiv__ | self, x | object | /= operator for old-style division
__ifloordiv__ | self, x | object | //= operator
__itruediv__ | self, x | object | /= operator for new-style division
__imod__ | self, x | object | %= operator
__ipow__ | x, y, z | object | **= operator
__ilshift__ | self, x | object | <<= operator
__irshift__ | self, x | object | >>= operator
__iand__ | self, x | object | &= operator
__ior__ | self, x | object | |= operator
__ixor__ | self, x | object | ^= operator

## Sequences and mappings

Name | Parameters | Return type | Description
--- | --- | --- | ---
__len__ | self int |  | len(self)
__getitem__ | self, x | object | self[x]
__setitem__ | self, x, y |  | self[x] = y
__delitem__ | self, x |  | del self[x]
__getslice__ | self, Py_ssize_t i, Py_ssize_t j | object | self[i:j]
__setslice__ | self, Py_ssize_t i, Py_ssize_t j, x |  | self[i:j] = x
__delslice__ | self, Py_ssize_t i, Py_ssize_t j |  | del self[i:j]
__contains__ | self, x | int | x in self

## Iterators

Name | Parameters | Return type | Description
--- | --- | --- | ---
__next__ | self | object | Get next item (called next in Python)

## Buffer interface

Note

The buffer interface is intended for use by C code and is not directly accessible from Python. It is described in the Python/C API Reference Manual under sections 6.6 and 10.6.

Name | Parameters | Return type | Description
--- | --- | --- | ---
__getreadbuffer__ | self, int i, void **p |  |
__getwritebuffer__ | self, int i, void **p |  |
__getsegcount__ | self, int *p |  |
__getcharbuffer__ | self, int i, char **p |  |

## Descriptor objects

Note

Descriptor objects are part of the support mechanism for new-style Python classes. See the discussion of descriptors in the Python documentation. See also PEP 252, “Making Types Look More Like Classes”, and PEP 253, “Subtyping Built-In Types”.

Name | Parameters | Return type | Description
--- | --- | --- | ---
__get__ | self, instance, class | object | Get value of attribute
__set__ | self, instance, value |  | Set value of attribute
__delete__ | self, instance |  | Delete attribute