ó ~9­\c@ s€dZddlmZddlmZddlmZddlmZddl m Z ddl m Z d e fd „ƒYZd S( sG Unit system for physical quantities; include definition of constants. iÿÿÿÿ(tdivision(tS(t deprecated(tQuantity(tSymPyDeprecationWarningi(tDimensionSystemt UnitSystemcB skeZdZd ddd„Zd„Zd„Zd ddd„Zd„Zed„ƒZ ed„ƒZ RS( sð UnitSystem represents a coherent set of units. A unit system is basically a dimension system with notions of scales. Many of the methods are defined in the same way. It is much better if all base units have a symbol. tc sá||_||_g|D]}|j^q}g|D]}|j|kr5|j^q5}t||ƒ|_|jsƒtdƒ‚ntt|ƒt|ƒBƒ|_ t d„|Dƒƒ‰t‡fd†|jj Dƒƒ|_ dS(NsUnitSystem is not consistentcs s|]}|j|fVqdS(N(t dimension(t.0tu((s=lib/python2.7/site-packages/sympy/physics/units/unitsystem.pys ,sc3 s|]}ˆ|VqdS(N((R td(t base_dict(s=lib/python2.7/site-packages/sympy/physics/units/unitsystem.pys /s( tnametdescrRRt_systemt is_consistentt ValueErrorttupletsett_unitstdictt base_dimst _base_units(tselftbasetunitsR RR Rt derived_dims((R s=lib/python2.7/site-packages/sympy/physics/units/unitsystem.pyt__init__s  + cC s8|jdkr|jSddjd„|jDƒƒSdS(sš Return the name of the system. If it does not exist, then it makes a list of symbols (or names) of the base dimensions. RsUnitSystem((%s))s, cs s|]}t|ƒVqdS(N(tstr(R R ((s=lib/python2.7/site-packages/sympy/physics/units/unitsystem.pys =sN(R tjoinR(R((s=lib/python2.7/site-packages/sympy/physics/units/unitsystem.pyt__str__1s cC sdt|jƒS(Ns(treprR(R((s=lib/python2.7/site-packages/sympy/physics/units/unitsystem.pyt__repr__?scC s9|jt|ƒ}|jt|ƒ}t||||ƒS(sExtend the current system into a new one. Take the base and normal units of the current system to merge them to the base and normal units given in argument. If not provided, name and description are overridden by empty strings. (RRRR(RRRR t description((s=lib/python2.7/site-packages/sympy/physics/units/unitsystem.pytextendBsc C sEtddddddddƒjƒd d lm}|||jƒS( sÈ Useless method. DO NOT USE, use instead ``convert_to``. Give the string expression of a unit in term of the basis. Units are displayed by decreasing power. tdeprecated_since_versions1.2tissuei4tfeaturetprint_unit_baset useinsteadt convert_toiÿÿÿÿ(R)(Rtwarntsympy.physics.unitsR)R(RtunitR)((s=lib/python2.7/site-packages/sympy/physics/units/unitsystem.pyR'Os  cC s |jjS(sr Give the dimension of the system. That is return the number of units forming the basis. (Rtdim(R((s=lib/python2.7/site-packages/sympy/physics/units/unitsystem.pyR-bscC s |jjS(sI Check if the underlying dimension system is consistent. (RR(R((s=lib/python2.7/site-packages/sympy/physics/units/unitsystem.pyRls((( t__name__t __module__t__doc__RRR!R#R'tpropertyR-R(((s=lib/python2.7/site-packages/sympy/physics/units/unitsystem.pyRs    N(R0t __future__RtsympyRtsympy.core.decoratorsRtsympy.physics.units.quantitiesRtsympy.utilities.exceptionsRt dimensionsRtobjectR(((s=lib/python2.7/site-packages/sympy/physics/units/unitsystem.pyts