3.3.6 Emulating numeric types

The following methods can be defined to emulate numeric objects. Methods corresponding to operations that are not supported by the particular kind of number implemented (e.g., bitwise operations for non-integral numbers) should be left undefined.

__add__(self, other)
__sub__(self, other)
__mul__(self, other)
__div__(self, other)
__mod__(self, other)
__divmod__(self, other)
__pow__(self, other[, modulo])
__lshift__(self, other)
__rshift__(self, other)
__and__(self, other)
__xor__(self, other)
__or__(self, other): These functions are called to implement the binary arithmetic operations (+, -, *, /, %, divmod() pow() **, <<, >>, &, ^, |). For instance, to evaluate the expression x+y, where x is an instance of a class that has an __add__() method, x.__add__(y) is called. Note that __pow__() should be defined to accept an optional third argument if the ternary version of the built-in pow() function is to be supported.

__radd__(self, other)
__rsub__(self, other)
__rmul__(self, other)
__rdiv__(self, other)
__rmod__(self, other)
__rdivmod__(self, other)
__rpow__(self, other)
__rlshift__(self, other)
__rrshift__(self, other)
__rand__(self, other)
__rxor__(self, other)
__ror__(self, other): These functions are called to implement the binary arithmetic operations (+, -, *, /, %, divmod() pow() **, <<, >>, &, ^, |) with reflected (swapped) operands. These functions are only called if the left operand does not support the corresponding operation. For instance, to evaluate the expression x-y, where y is an instance of a class that has an __rsub__() method, y.__rsub__(x) is called. Note that ternary pow() will not try calling __rpow__() (the coercion rules would become too complicated).

__iadd__(self, other)
__isub__(self, other)
__imul__(self, other)
__idiv__(self, other)
__imod__(self, other)
__ipow__(self, other[, modulo])
__ilshift__(self, other)
__irshift__(self, other)
__iand__(self, other)
__ixor__(self, other)
__ior__(self, other): These methods are called to implement the augmented arithmetic operations (+=, -=, *=, /=, %=, **=, <<=, >>=, &=, =, |=). These methods should attempt to do the operation in-place (modifying self) and return the result (which could be, but does not have to be, self). If a specific method is not defined, the augmented operation falls back to the normal methods. For instance, to evaluate the expression x+=y, where x is an instance of a class that has an __iadd__() method, x.__iadd__(y) is called. If x is an instance of a class that does not define a __iadd() method, x.__add__(y) and y.__radd__(x) are considered, as with the evaluation of x+y.

__neg__(self)
__pos__(self)
__abs__(self)
__invert__(self): Called to implement the unary arithmetic operations (-, +, abs() and ~).

__complex__(self)
__int__(self)
__long__(self)
__float__(self): Called to implement the built-in functions complex() int() long() and float() Should return a value of the appropriate type.

__oct__(self)
__hex__(self): Called to implement the built-in functions oct() and hex() Should return a string value.

__coerce__(self, other): Called to implement ``mixed-mode'' numeric arithmetic. Should either return a 2-tuple containing self and otherConverted to a common numeric type, or None if conversion is impossible. When the common type would be the type of other, it is sufficient to return None, since the interpreter will also ask the other object to attempt a coercion (but sometimes, if the implementation of the other type cannot be changed, it is useful to do the conversion to the other type here).

Coercion rules: to evaluate x op y, the following steps are taken (where __op__() and __rop__() are the method names corresponding to op, e.g., if op is `+', __add__() and __radd__() are used). If an exception occurs at any point, the evaluation is abandoned and exception handling takes over.

0.

If x is a string object and op is the modulo operator (%), the string formatting operation is invoked and the remaining steps are skipped.

1.

If x is a class instance:

1a.: If x has a __coerce__() method: replace x and y with the 2-tuple returned by x.__coerce__(y); skip to step 2 if the coercion returns None.
1b.: If neither x nor y is a class instance after coercion, go to step 3.
1c.: If x has a method __op__(), return x.__op__(y); otherwise, restore x and y to their value before step 1a.

2.

If y is a class instance:

2a.: If y has a __coerce__() method: replace y and x with the 2-tuple returned by y.__coerce__(x); skip to step 3 if the coercion returns None.
2b.: If neither x nor y is a class instance after coercion, go to step 3.
2b.: If y has a method __rop__(), return y.__rop__(x); otherwise, restore x and y to their value before step 2a.

3.

We only get here if neither x nor y is a class instance.

3a.: If op is `+' and x is a sequence, sequence concatenation is invoked.
3b.: If op is `*' and one operand is a sequence and the other an integer, sequence repetition is invoked.
3c.: Otherwise, both operands must be numbers; they are coerced to a common type if possible, and the numeric operation is invoked for that type.

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