σ šίΘ[c@`sddlmZmZmZmZddlmZddlZddlZddl Z ddl Z ddl m Z mZddlmZddlmZddlmZdd lmZd d gZd efd „ƒYZejeƒdefd„ƒYƒZdefd„ƒYZdS(i(tabsolute_importtdivisiontprint_functiontunicode_literalsi(tsixN(tUnitt UnitsError(tQuantity(t lazyproperty(tAstropyUserWarning(tInheritDocstringsuConstantu EMConstantt ConstantMetacB`seZdZd„ZRS(u-Metaclass for the :class:`Constant`. The primary purpose of this is to wrap the double-underscore methods of :class:`Quantity` which is the superclass of :class:`Constant`. In particular this wraps the operator overloads such as `__add__` to prevent their use with constants such as ``e`` from being used in expressions without specifying a system. The wrapper checks to see if the constant is listed (by name) in ``Constant._has_incompatible_units``, a set of those constants that are defined in different systems of units are physically incompatible. It also performs this check on each `Constant` if it hasn't already been performed (the check is deferred until the `Constant` is actually used in an expression to speed up import times, among other reasons). cC`sΣd„}tdddddddd d d d d ddgƒ}xrtjttƒƒD][\}}t|tjƒrU|jdƒrU|j dƒrU||krU||ƒ||(RRER R7RPtstrRRQ(R((s9lib/python2.7/site-packages/astropy/constants/constant.pyt__repr__|scC`s(dj|j|j|j|j|jƒS(NuR Name = {0} Value = {1} Uncertainty = {2} Unit = {3} Reference = {4}(RR R7RPRRQ(R((s9lib/python2.7/site-packages/astropy/constants/constant.pyt__str__‚s  cC`s tt|ƒj|ƒdtfS(Ni(R0R;t__quantity_subclass__RN(RR((s9lib/python2.7/site-packages/astropy/constants/constant.pyRV‹scC`s|S(u¨ Return a copy of this `Constant` instance. Since they are by definition immutable, this merely returns another reference to ``self``. ((R((s9lib/python2.7/site-packages/astropy/constants/constant.pytcopyŽscC`s|jS(uŠA typical ASCII text abbreviation of the constant, also generally the same as the Python variable used for this constant. (RG(R((s9lib/python2.7/site-packages/astropy/constants/constant.pyR—scC`s|jS(uThe full name of the constant.(RH(R((s9lib/python2.7/site-packages/astropy/constants/constant.pyR ŸscC`s t|jƒS(u.The unit(s) in which this constant is defined.(RRJ(R((s9lib/python2.7/site-packages/astropy/constants/constant.pyt_unit₯scC`s|jS(u/The known uncertainty in this constant's value.(RK(R((s9lib/python2.7/site-packages/astropy/constants/constant.pyRP«scC`s|jS(u/The source used for the value of this constant.(RL(R((s9lib/python2.7/site-packages/astropy/constants/constant.pyRQ±scC`s|jS(u¬The system of units in which this constant is defined (typically `None` so long as the constant's units can be directly converted between systems). (RM(R((s9lib/python2.7/site-packages/astropy/constants/constant.pyR·scC`sO|j|jjƒ}|j|ƒ}|dk r5|Sttt|ƒ|ƒSdS(N(RR R tgetR<R=R0R;(RtkeyRR ((s9lib/python2.7/site-packages/astropy/constants/constant.pyt_instance_or_superΐs  cC`s |jdƒS(ušIf the Constant is defined in the SI system return that instance of the constant, else convert to a Quantity in the appropriate SI units. usi(R[(R((s9lib/python2.7/site-packages/astropy/constants/constant.pytsiΘscC`s |jdƒS(uœIf the Constant is defined in the CGS system return that instance of the constant, else convert to a Quantity in the appropriate CGS units. ucgs(R[(R((s9lib/python2.7/site-packages/astropy/constants/constant.pytcgsΠscC`sFx*d D]"}t||t||dƒƒqWt|dtƒ|_dS( Nu_abbrevu_nameu_valueu _unit_stringu _uncertaintyu _referenceu_systemu_checked_units(u_abbrevu_nameu_valueu _unit_stringu _uncertaintyu _referenceu_system(RFR=R<RNR(RtobjR6((s9lib/python2.7/site-packages/astropy/constants/constant.pyt__array_finalize__Ψs  N(R8R9R:RR(RR<R1RTRURVRWt __deepcopy__t__copy__tpropertyRR RRXRPRQRR[R\R]R_(((s9lib/python2.7/site-packages/astropy/constants/constant.pyR;Os& "     t EMConstantcB`seZdZed„ƒZRS(uAn electromagnetic constant.cC`stdƒ‚dS(u{Overridden for EMConstant to raise a `TypeError` emphasizing that there are multiple EM extensions to CGS. uγCannot convert EM constants to cgs because there are different systems for E.M constants within the c.g.s system (ESU, Gaussian, etc.). Instead, directly use the constant with the appropriate suffix (e.g. e.esu, e.gauss, etc.).N(R(R((s9lib/python2.7/site-packages/astropy/constants/constant.pyR]γs(R8R9R:RbR](((s9lib/python2.7/site-packages/astropy/constants/constant.pyRcΰs(t __future__RRRRtexternRR%R,RBtnumpyR?t units.coreRRtunits.quantityRtutilsRtutils.exceptionsR t utils.miscR t__all__R t add_metaclassR;Rc(((s9lib/python2.7/site-packages/astropy/constants/constant.pyts"     ;