add unicode units (#1471)
* adds unicode units * keep "u" and "Ohm" for compatibility * add c, d, da and h * lint * py2 compatible u"" strings
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@ -1,41 +1,41 @@
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# -*- coding: utf-8 -*-
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## Very simple unit support:
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## - creates variable names like 'mV' and 'kHz'
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## - the value assigned to the variable corresponds to the scale prefix
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## (mV = 0.001)
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## - the actual units are purely cosmetic for making code clearer:
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##
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## x = 20*pA is identical to x = 20*1e-12
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# Very simple unit support:
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# - creates variable names like 'mV' and 'kHz'
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# - the value assigned to the variable corresponds to the scale prefix
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# (mV = 0.001)
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# - the actual units are purely cosmetic for making code clearer:
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#
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# x = 20*pA is identical to x = 20*1e-12
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#
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# No unicode variable names (μ,Ω) allowed until python 3, but just assigning
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# them to the globals dict doesn't error in python 2.
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import unicodedata
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## No unicode variable names (μ,Ω) allowed until python 3
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SI_PREFIXES = 'yzafpnum kMGTPEZY'
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UNITS = 'm,s,g,W,J,V,A,F,T,Hz,Ohm,S,N,C,px,b,B,Pa'.split(',')
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# All unicode identifiers get normalized automatically
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SI_PREFIXES = unicodedata.normalize("NFKC", u"yzafpnµm kMGTPEZY")
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UNITS = unicodedata.normalize("NFKC", u"m,s,g,W,J,V,A,F,T,Hz,Ohm,Ω,S,N,C,px,b,B,Pa").split(",")
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allUnits = {}
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def addUnit(p, n):
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def addUnit(prefix, val):
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g = globals()
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v = 1000**n
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for u in UNITS:
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g[p+u] = v
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allUnits[p+u] = v
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for p in SI_PREFIXES:
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if p == ' ':
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p = ''
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n = 0
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elif p == 'u':
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n = -2
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else:
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n = SI_PREFIXES.index(p) - 8
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addUnit(p, n)
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cm = 0.01
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g[prefix + u] = val
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allUnits[prefix + u] = val
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for pre in SI_PREFIXES:
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v = SI_PREFIXES.index(pre) - 8
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if pre == " ":
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pre = ""
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addUnit(pre, 1000 ** v)
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addUnit("c", 0.01)
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addUnit("d", 0.1)
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addUnit("da", 10)
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addUnit("h", 100)
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# py2 compatibility
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addUnit("u", 1e-6)
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def evalUnits(unitStr):
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@ -47,6 +47,7 @@ def evalUnits(unitStr):
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"""
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pass
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def formatUnits(units):
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"""
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Format a unit specification ([numerators,...], [denominators,...])
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@ -54,11 +55,10 @@ def formatUnits(units):
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"""
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pass
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def simplify(units):
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"""
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Cancel units that appear in both numerator and denominator, then attempt to replace
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groups of units with single units where possible (ie, J/s => W)
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"""
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pass
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