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fractions.cpython-35.pyc
|gF_ @ s d Z d d l m Z d d l Z d d l Z d d l Z d d l Z d d l Z d d g Z d d Z d d Z e j j Z e j j Z e j d e j e j B Z Gd d d e j Z d S) z+Fraction, infinite-precision, real numbers. )DecimalNFractiongcdc C s d d l } | j d t d t | t k oB t | k n rz | pP | d k rj t j | | St j | | St | | S)zCalculate the Greatest Common Divisor of a and b. Unless b==0, the result will have the same sign as b (so that when b is divided by it, the result comes out positive). r Nz6fractions.gcd() is deprecated. Use math.gcd() instead. )warningswarnDeprecationWarningtypeintmathr _gcd)abr r /usr/lib/python3.5/fractions.pyr s (c C s" x | r | | | } } q W| S)Nr )r r r r r r s r aC \A\s* # optional whitespace at the start, then (?P<sign>[-+]?) # an optional sign, then (?=\d|\.\d) # lookahead for digit or .digit (?P<num>\d*) # numerator (possibly empty) (?: # followed by (?:/(?P<denom>\d+))? # an optional denominator | # or (?:\.(?P<decimal>\d*))? # an optional fractional part (?:E(?P<exp>[-+]?\d+))? # and optional exponent ) \s*\Z # and optional whitespace to finish c se e Z d Z d Z dR Z d d d f d d Z e d d Z e d d Z d d d Z e d d Z e d d Z d d Z d d Z d d Z d d Z e e e j \ Z Z d d Z e e e j \ Z Z d d Z e e e j \ Z Z d d! Z e e e j \ Z Z d" d# Z! d$ d% Z" d& d' Z# d( d) Z$ d* d+ Z% d, d- Z& d. d/ Z' d0 d1 Z( d2 d3 Z) d4 d5 Z* d6 d7 Z+ d8 d9 Z, d d: d; Z- d< d= Z. d> d? Z/ d@ dA Z0 dB dC Z1 dD dE Z2 dF dG Z3 dH dI Z4 dJ dK Z5 dL dM Z6 dN dO Z7 dP dQ Z8 S)Sr a] This class implements rational numbers. In the two-argument form of the constructor, Fraction(8, 6) will produce a rational number equivalent to 4/3. Both arguments must be Rational. The numerator defaults to 0 and the denominator defaults to 1 so that Fraction(3) == 3 and Fraction() == 0. Fractions can also be constructed from: - numeric strings similar to those accepted by the float constructor (for example, '-2.3' or '1e10') - strings of the form '123/456' - float and Decimal instances - other Rational instances (including integers) _numerator _denominatorr NTc sU t t | j | } | d k r+t | t k rL | | _ d | _ | St | t j rz | j | _ | j | _ | St | t r t j | } | j | _ | j | _ | St | t r t j | } | j | _ | j | _ | St | t r t j | } | d k r(t d | t | j d p=d } | j d } | rgt | } n d } | j d } | rd t | } | | t | } | | 9} | j d } | rt | } | d k r| d | 9} n | d | 9} | j d d k r(| } qt d n t | t k oNt | k n rVnT t | t j rt | t j r| j | j | j | j } } n t d | d k rt d | | r?t | t k ot | k n r t j | | } | d k r+| } n t | | } | | } | | } | | _ | | _ | S)a Constructs a Rational. Takes a string like '3/2' or '1.5', another Rational instance, a numerator/denominator pair, or a float. Examples -------- >>> Fraction(10, -8) Fraction(-5, 4) >>> Fraction(Fraction(1, 7), 5) Fraction(1, 35) >>> Fraction(Fraction(1, 7), Fraction(2, 3)) Fraction(3, 14) >>> Fraction('314') Fraction(314, 1) >>> Fraction('-35/4') Fraction(-35, 4) >>> Fraction('3.1415') # conversion from numeric string Fraction(6283, 2000) >>> Fraction('-47e-2') # string may include a decimal exponent Fraction(-47, 100) >>> Fraction(1.47) # direct construction from float (exact conversion) Fraction(6620291452234629, 4503599627370496) >>> Fraction(2.25) Fraction(9, 4) >>> Fraction(Decimal('1.47')) Fraction(147, 100) N z Invalid literal for Fraction: %rZnum0denomdecimal expr sign-z2argument should be a string or a Rational instancez+both arguments should be Rational instanceszFraction(%s, 0))superr __new__r r r r isinstancenumbersRational numerator denominatorfloat from_floatr from_decimalstr_RATIONAL_FORMATmatch ValueErrorgrouplen TypeErrorZeroDivisionErrorr r r ) clsr r! _normalizeselfvaluemr r Zscaler g) __class__r r r T s ( ( zFraction.__new__c C s t | t j r | | St | t sP t d | j | t | j f t j | rx t d | | j f t j | r t d | | j f | | j S)zConverts a finite float to a rational number, exactly. Beware that Fraction.from_float(0.3) != Fraction(3, 10). z.%s.from_float() only takes floats, not %r (%s)zCannot convert %r to %s.) r r Integralr" r+ __name__r r isnanr( isinf OverflowErroras_integer_ratio)r- fr r r r# s zFraction.from_floatc C s) d d l m } t | t j r7 | t | } n4 t | | sk t d | j | t | j f | j r t d | | j f | j r t d | | j f | j \ } } } t d j t t | } | r | } | d k r| | d | S| | d | Sd S)zAConverts a finite Decimal instance to a rational number, exactly.r )r z2%s.from_decimal() only takes Decimals, not %r (%s)zCannot convert %s to %s. r N)r r r r r4 r r+ r5 r Z is_infiniter8 Zis_nanr( Zas_tuplejoinmapr% )r- Zdecr r Zdigitsr r r r r$ s& zFraction.from_decimali@B c C s% | d k r t d | j | k r1 t | Sd \ } } } } | j | j } } xd | | } | | | } | | k r~ P| | | | | | f \ } } } } | | | | } } qY W| | | } t | | | | | | } t | | } t | | t | | k r | S| Sd S)aW Closest Fraction to self with denominator at most max_denominator. >>> Fraction('3.141592653589793').limit_denominator(10) Fraction(22, 7) >>> Fraction('3.141592653589793').limit_denominator(100) Fraction(311, 99) >>> Fraction(4321, 8765).limit_denominator(10000) Fraction(4321, 8765) r z$max_denominator should be at least 1r N)r r r r )r( r r r abs) r/ Zmax_denominatorZp0Zq0Zp1Zq1ndr Zq2kZbound1Zbound2r r r limit_denominator s& & zFraction.limit_denominatorc C s | j S)N)r )r r r r r * s zFraction.numeratorc C s | j S)N)r )r r r r r! . s zFraction.denominatorc C s d | j j | j | j f S)z repr(self)z %s(%s, %s))r3 r5 r r )r/ r r r __repr__2 s zFraction.__repr__c C s4 | j d k r t | j Sd | j | j f Sd S)z str(self)r z%s/%sN)r r% r )r/ r r r __str__7 s zFraction.__str__c st f d d } d j d | _ j | _ f d d } d j d | _ j | _ | | f S)a Generates forward and reverse operators given a purely-rational operator and a function from the operator module. Use this like: __op__, __rop__ = _operator_fallbacks(just_rational_op, operator.op) In general, we want to implement the arithmetic operations so that mixed-mode operations either call an implementation whose author knew about the types of both arguments, or convert both to the nearest built in type and do the operation there. In Fraction, that means that we define __add__ and __radd__ as: def __add__(self, other): # Both types have numerators/denominator attributes, # so do the operation directly if isinstance(other, (int, Fraction)): return Fraction(self.numerator * other.denominator + other.numerator * self.denominator, self.denominator * other.denominator) # float and complex don't have those operations, but we # know about those types, so special case them. elif isinstance(other, float): return float(self) + other elif isinstance(other, complex): return complex(self) + other # Let the other type take over. return NotImplemented def __radd__(self, other): # radd handles more types than add because there's # nothing left to fall back to. if isinstance(other, numbers.Rational): return Fraction(self.numerator * other.denominator + other.numerator * self.denominator, self.denominator * other.denominator) elif isinstance(other, Real): return float(other) + float(self) elif isinstance(other, Complex): return complex(other) + complex(self) return NotImplemented There are 5 different cases for a mixed-type addition on Fraction. I'll refer to all of the above code that doesn't refer to Fraction, float, or complex as "boilerplate". 'r' will be an instance of Fraction, which is a subtype of Rational (r : Fraction <: Rational), and b : B <: Complex. The first three involve 'r + b': 1. If B <: Fraction, int, float, or complex, we handle that specially, and all is well. 2. If Fraction falls back to the boilerplate code, and it were to return a value from __add__, we'd miss the possibility that B defines a more intelligent __radd__, so the boilerplate should return NotImplemented from __add__. In particular, we don't handle Rational here, even though we could get an exact answer, in case the other type wants to do something special. 3. If B <: Fraction, Python tries B.__radd__ before Fraction.__add__. This is ok, because it was implemented with knowledge of Fraction, so it can handle those instances before delegating to Real or Complex. The next two situations describe 'b + r'. We assume that b didn't know about Fraction in its implementation, and that it uses similar boilerplate code: 4. If B <: Rational, then __radd_ converts both to the builtin rational type (hey look, that's us) and proceeds. 5. Otherwise, __radd__ tries to find the nearest common base ABC, and fall back to its builtin type. Since this class doesn't subclass a concrete type, there's no implementation to fall back to, so we need to try as hard as possible to return an actual value, or the user will get a TypeError. c sn t | t t f r" | | St | t rD t | | St | t rf t | | St Sd S)N)r r r r" complexNotImplemented)r r )fallback_operatormonomorphic_operatorr r forward s z-Fraction._operator_fallbacks.<locals>.forward__c s} t | t j r | | St | t j rJ t | t | St | t j ru t | t | St Sd S)N)r r r ZRealr" ComplexrE rF )r r )rG rH r r reverse s z-Fraction._operator_fallbacks.<locals>.reverseZ__r)r5 __doc__)rH rG rI rL r )rG rH r _operator_fallbacks> s P z Fraction._operator_fallbacksc C s6 | j | j } } t | j | | j | | | S)za + b)r! r r )r r dadbr r r _add s z Fraction._addc C s6 | j | j } } t | j | | j | | | S)za - b)r! r r )r r rO rP r r r _sub s z Fraction._subc C s! t | j | j | j | j S)za * b)r r r! )r r r r r _mul s z Fraction._mulc C s! t | j | j | j | j S)za / b)r r r! )r r r r r _div s z Fraction._divc C s t j | | S)za // b)r floor)r r r r r __floordiv__ s zFraction.__floordiv__c C s t j | | S)za // b)r rU )r r r r r __rfloordiv__ s zFraction.__rfloordiv__c C s | | } | | | S)za % br )r r divr r r __mod__ s zFraction.__mod__c C s | | } | | | S)za % br )r r rX r r r __rmod__ s zFraction.__rmod__c C s t | t j r | j d k r} | j } | d k rW t | j | | j | d d St | j | | j | d d Sq t | t | Sn t | | Sd S)za ** b If b is not an integer, the result will be a float or complex since roots are generally irrational. If b is an integer, the result will be rational. r r r. FN) r r r r! r r r r r" )r r Zpowerr r r __pow__ s zFraction.__pow__c C sz | j d k r) | j d k r) | | j St | t j rR t | j | j | S| j d k rl | | j S| t | S)za ** br r ) r r r r r r r r! r" )r r r r r __rpow__ s zFraction.__rpow__c C s t | j | j d d S)z++a: Coerces a subclass instance to Fractionr. F)r r r )r r r r __pos__ s zFraction.__pos__c C s t | j | j d d S)z-ar. F)r r r )r r r r __neg__ s zFraction.__neg__c C s t t | j | j d d S)zabs(a)r. F)r r> r r )r r r r __abs__ s zFraction.__abs__c C s1 | j d k r | j | j S| j | j Sd S)ztrunc(a)r N)r r )r r r r __trunc__ s zFraction.__trunc__c C s | j | j S)z Will be math.floor(a) in 3.0.)r r! )r r r r __floor__ s zFraction.__floor__c C s | j | j S)z Will be math.ceil(a) in 3.0.)r r! )r r r r __ceil__ s zFraction.__ceil__c C s | d k ru t | j | j \ } } | d | j k r> | S| d | j k rY | d S| d d k rm | S| d Sd t | } | d k r t t | | | St t | | | Sd S)zOWill be round(self, ndigits) in 3.0. Rounds half toward even. Nr r r r )divmodr r! r> r round)r/ ZndigitsrU Z remainderZshiftr r r __round__ s zFraction.__round__c C sl t | j t d t } | s( t } n t | j | t } | d k rQ | n | } | d k rh d S| S)z hash(self)r r r )powr _PyHASH_MODULUS _PyHASH_INFr> r )r/ ZdinvZhash_resultr r r __hash__5 s zFraction.__hash__c C s t | t k r. | j | k o- | j d k St | t j rb | j | j k oa | j | j k St | t j r | j d k r | j } t | t r t j | s t j | r d | k S| | j | k Sn t Sd S)za == br r g N)r r r r r r r r r! rK imagrealr" r r6 r7 r# rF )r r r r r __eq__K s ! zFraction.__eq__c C s t | t j r3 | | j | j | j | j St | t r t j | s` t j | rm | d | S| | | j | Sn t Sd S)ac Helper for comparison operators, for internal use only. Implement comparison between a Rational instance `self`, and either another Rational instance or a float `other`. If `other` is not a Rational instance or a float, return NotImplemented. `op` should be one of the six standard comparison operators. g N) r r r r r! r r r" r r6 r7 r# rF )r/ otheropr r r _richcmp` s zFraction._richcmpc C s | j | t j S)za < b)rr operatorlt)r r r r r __lt__v s zFraction.__lt__c C s | j | t j S)za > b)rr rs gt)r r r r r __gt__z s zFraction.__gt__c C s | j | t j S)za <= b)rr rs le)r r r r r __le__~ s zFraction.__le__c C s | j | t j S)za >= b)rr rs ge)r r r r r __ge__ s zFraction.__ge__c C s | j d k S)za != 0r )r )r r r r __bool__ s zFraction.__bool__c C s | j t | f f S)N)r3 r% )r/ r r r __reduce__ s zFraction.__reduce__c C s, t | t k r | S| j | j | j S)N)r r r3 r r )r/ r r r __copy__ s zFraction.__copy__c C s, t | t k r | S| j | j | j S)N)r r r3 r r )r/ memor r r __deepcopy__ s zFraction.__deepcopy__)z _numeratorz _denominator)9r5 __module__ __qualname__rM __slots__r classmethodr# r$ rB propertyr r! rC rD rN rQ rs add__add____radd__rR sub__sub____rsub__rS mul__mul____rmul__rT truediv __truediv__ __rtruediv__rV rW rY rZ r[ r\ r] r^ r_ r` ra rb re rl ro rr ru rw ry r{ r| r} r~ r r r )r3 r r < sV u7 k )rM r r r r rs resys__all__r r hash_infomodulusri infrj compileVERBOSE IGNORECASEr& r r r r r r <module> s