Hi Pablo, sorry for my shortcut. :) PR = pull request, here is how it works:
https://help.github.com/articles/using-pull-requests yes we use git and github. Start by: git clone https://github.com/sympy/sympy and try to follow the help article. Please ask if you get stuck. Using git and github is a great way to do development, you can use it for any other project as well, not just sympy. Ondrej On Wed, Jul 3, 2013 at 10:54 AM, peibol <[email protected]> wrote: > Sure. Call me stupid, but what's a PR? I'll need some help with the > procedure. > > Are you using GIT or what? > > > El miércoles, 3 de julio de 2013 18:18:02 UTC+2, Ondřej Čertík escribió: >> >> Excellent. >> >> Pablo, can you please send a PR with this? We'll then improve it there >> and I can help with setting up the tests. Please ask if you get stuck. >> >> Ondrej >> >> On Wed, Jul 3, 2013 at 9:49 AM, Aaron Meurer <[email protected]> wrote: >> > Yes, definitely. Eventually, I would like to have a nice framework to >> > make parsing things like this easier and have a nicer, more extensible >> > API, but for now, I think even simple parsers like this are better >> > than nothing. >> > >> > Aaron Meurer >> > >> > On Wed, Jul 3, 2013 at 10:48 AM, Ondřej Čertík <[email protected]> >> > wrote: >> >> Pablo, >> >> >> >> On Wed, Jul 3, 2013 at 5:38 AM, peibol <[email protected]> wrote: >> >>> It will be something like that. For the moment, I'm just implemented >> >>> the >> >>> basics of presentation mathml. I will add features as I need them. >> >>> >> >>> After running it, sympify should be called. What do you think about >> >>> it? >> >>> >> >>> def parseMML(mmlinput): >> >>> from lxml import etree >> >>> from StringIO import * >> >>> from lxml import objectify >> >>> mmlinput= mmlinput.replace(' xmlns="', ' xmlnamespace="') >> >>> parser = >> >>> etree.XMLParser(ns_clean=True,remove_pis=True,remove_comments=True) >> >>> tree = etree.parse(StringIO(mmlinput), parser) >> >>> >> >>> objectify.deannotate(tree,cleanup_namespaces=True,xsi=True,xsi_nil=True) >> >>> mmlinput=etree.tostring(tree.getroot()) >> >>> exppy="" #this is the python expression >> >>> symvars=[] #these are symbolic variables which can eventually take >> >>> part in >> >>> the expression >> >>> events = ("start", "end") >> >>> level = 0 >> >>> context = etree.iterparse(StringIO(mmlinput),events=events) >> >>> for action, elem in context: >> >>> if (action=='start') and (elem.tag=='mfrac'): >> >>> level += 1 >> >>> mmlaux=etree.tostring(elem[0]) >> >>> (a,b)=parseMML(mmlaux) >> >>> symvars.append(b) >> >>> exppy+=a >> >>> exppy+='/' >> >>> mmlaux=etree.tostring(elem[1]) >> >>> (a,b)=parseMML(mmlaux) >> >>> symvars.append(b) >> >>> exppy+=a >> >>> if (action=='end') and (elem.tag=='mfrac'): >> >>> level -= 1 >> >>> if level: >> >>> continue >> >>> if (action=='start') and (elem.tag=='mrow'): >> >>> exppy+='(' >> >>> if (action=='end') and (elem.tag=='mrow'): >> >>> exppy+=')' >> >>> if action=='start' and elem.tag=='mn': #this is a number >> >>> exppy+=elem.text >> >>> if action=='start' and elem.tag=='mi': #this is a variable >> >>> exppy+=elem.text >> >>> symvars.append(elem.text) #we'll return the variable, so sympy can >> >>> sympify >> >>> it afterwards >> >>> if action=='start' and elem.tag=='mo': #this is a operation >> >>> exppy+=elem.text >> >>> return (exppy, symvars) >> >>> >> >>> >> >>> With the example: mmlinput='''<?xml version="1.0"?> <math >> >>> xmlns="http://www.w3.org/1998/Math/MathML"; >> >>> xmlns:mml="http://www.w3.org/1998/Math/MathML"; >> >>> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; >> >>> xsi:schemaLocation="http://www.w3.org/1998/Math/MathML >> >>> http://www.w3.org/Math/XMLSchema/mathml2/mathml2.xsd";> <mrow> <mfrac> >> >>> <mrow> >> >>> <mn>3</mn> </mrow> <mrow> <mn>57</mn> </mrow> </mfrac> </mrow> >> >>> </math>''' >> >>> >> >>> We get: >> >>> exppy='((3)/(57))' >> >> >> >> >> >> I think that's a great start. I assume you pass the expression to >> >> sympify() and obtain a SymPy expression as a result. >> >> >> >> Aaron, I think we should have this in sympy, what do you think? We can >> >> install lxml in .travis.yml and have this tested. If so, I can help >> >> you Pablo with sending a PR and get it setup. >> >> >> >> Ondrej >> >> >> >> -- >> >> You received this message because you are subscribed to the Google >> >> Groups "sympy" group. >> >> To unsubscribe from this group and stop receiving emails from it, send >> >> an email to [email protected]. >> >> To post to this group, send email to [email protected]. >> >> Visit this group at http://groups.google.com/group/sympy. >> >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> >> >> > >> > -- >> > You received this message because you are subscribed to the Google >> > Groups "sympy" group. >> > To unsubscribe from this group and stop receiving emails from it, send >> > an email to [email protected]. >> > To post to this group, send email to [email protected]. >> > Visit this group at http://groups.google.com/group/sympy. >> > For more options, visit https://groups.google.com/groups/opt_out. >> > >> > > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/sympy. > For more options, visit https://groups.google.com/groups/opt_out. > > -- You received this message because you are subscribed to the Google Groups "sympy" group. 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