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add unicode units (#1471)

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* adds unicode units

* keep "u" and "Ohm" for compatibility
* add c, d, da and h
* lint

* py2 compatible u"" strings
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Martin Chase 2021-01-03 14:28:56 -08:00 committed by GitHub
parent 64e04e3120
commit 1a71bb53c4
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1 changed files with 33 additions and 33 deletions
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pyqtgraph/units.py
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@ -1,41 +1,41 @@
# -*- coding: utf-8 -*-
## Very simple unit support:
## - creates variable names like 'mV' and 'kHz'
## - the value assigned to the variable corresponds to the scale prefix
## (mV = 0.001)
## - the actual units are purely cosmetic for making code clearer:
##
## x = 20*pA is identical to x = 20*1e-12
# Very simple unit support:
# - creates variable names like 'mV' and 'kHz'
# - the value assigned to the variable corresponds to the scale prefix
# (mV = 0.001)
# - the actual units are purely cosmetic for making code clearer:
#
# x = 20*pA is identical to x = 20*1e-12
#
# No unicode variable names (μ,Ω) allowed until python 3, but just assigning
# them to the globals dict doesn't error in python 2.
import unicodedata
## No unicode variable names (μ,Ω) allowed until python 3
SI_PREFIXES = 'yzafpnum kMGTPEZY'
UNITS = 'm,s,g,W,J,V,A,F,T,Hz,Ohm,S,N,C,px,b,B,Pa'.split(',')
# All unicode identifiers get normalized automatically
SI_PREFIXES = unicodedata.normalize("NFKC", u"yzafpnµm kMGTPEZY")
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(",")
allUnits = {}
def addUnit(p, n):
def addUnit(prefix, val):
g = globals()
v = 1000**n
for u in UNITS:
g[p+u] = v
allUnits[p+u] = v
for p in SI_PREFIXES:
if p == ' ':
p = ''
n = 0
elif p == 'u':
n = -2
else:
n = SI_PREFIXES.index(p) - 8
addUnit(p, n)
cm = 0.01
g[prefix + u] = val
allUnits[prefix + u] = val
for pre in SI_PREFIXES:
v = SI_PREFIXES.index(pre) - 8
if pre == " ":
pre = ""
addUnit(pre, 1000 ** v)
addUnit("c", 0.01)
addUnit("d", 0.1)
addUnit("da", 10)
addUnit("h", 100)
# py2 compatibility
addUnit("u", 1e-6)
def evalUnits(unitStr):
@ -46,19 +46,19 @@ def evalUnits(unitStr):
A*s / V => ([A, s], [V,])
"""
pass
def formatUnits(units):
"""
Format a unit specification ([numerators,...], [denominators,...])
into a string (this is the inverse of evalUnits)
"""
pass
def simplify(units):
"""
Cancel units that appear in both numerator and denominator, then attempt to replace
groups of units with single units where possible (ie, J/s => W)
"""
pass