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  • get_or_create generic relations in Django & python debugging in general

    - by rabidpebble
    I ran the code to create the generically related objects from this demo: http://www.djangoproject.com/documentation/models/generic_relations/ Everything is good intially: >>> bacon.tags.create(tag="fatty") <TaggedItem: fatty> >>> tag, newtag = bacon.tags.get_or_create(tag="fatty") >>> tag <TaggedItem: fatty> >>> newtag False But then the use case that I'm interested in for my app: >>> tag, newtag = bacon.tags.get_or_create(tag="wholesome") Traceback (most recent call last): File "<console>", line 1, in <module> File "/usr/local/lib/python2.6/dist-packages/django/db/models/manager.py", line 123, in get_or_create return self.get_query_set().get_or_create(**kwargs) File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 343, in get_or_create raise e IntegrityError: app_taggeditem.content_type_id may not be NULL I tried a bunch of random things after looking at other code: >>> tag, newtag = bacon.tags.get_or_create(tag="wholesome", content_type=TaggedItem) ValueError: Cannot assign "<class 'generics.app.models.TaggedItem'>": "TaggedItem.content_type" must be a "ContentType" instance. or: >>> tag, newtag = bacon.tags.get_or_create(tag="wholesome", content_type=TaggedItem.content_type) InterfaceError: Error binding parameter 3 - probably unsupported type. etc. I'm sure somebody can give me the correct syntax, but the real problem here is that I have no idea what is going on. I have developed in strongly typed languages for over ten years (x86 assembly, C++ and C#) but am new to Python. I find it really difficult to follow what is going on in Python when things like this break. In the languages I mentioned previously it's fairly straightforward to figure things like this out -- check the method signature and check your parameters. Looking at the Django documentation for half an hour left me just as lost. Looking at the source for get_or_create(self, **kwargs) didn't help either since there is no method signature and the code appears very generic. A next step would be to debug the method and try to figure out what is happening, but this seems a bit extreme... I seem to be missing some fundamental operating principle here... what is it? How do I resolve issues like this on my own in the future?

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  • complex if statement in python

    - by Neverland
    I need to realize a complex if-elif-else statement in Python but I don't get it working. The elif line I need has to check a variable for this conditions: 80, 443 or 1024-65535 inclusive I tried if ... # several checks ... elif (var1 > 65535) or ((var1 < 1024) and (var1 != 80) and (var1 != 443)): # fail else ...

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  • running code if try statements were successful in python

    - by None
    I was wondering if in python there was a simple way to run code if a try statement was successful that wasn't in the try statement itself. Is that what the else or finally commands do (I didn't understand their documentation)? I know I could use code like this: successful = False try: #code that might fail successful = True except: #error handling if code failed if successful: #code to run if try was successful that isn't part of try but I was wondering if there was a shorter way .

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  • Project Euler #290 in python, hint please

    - by debragail
    This solution is grossly inefficient. What am I missing? #!/usr/bin/env python #coding: utf-8 import time from timestrings import * start = time.clock() maxpower = 18 count = 0 for i in range(0, 10 ** maxpower - 1): if i % 9 == 0: result1 = list(str(i)) result2 = list(str(137 * i)) sum1 = 0 for j in result1: sum1 += int(j) sum2 = 0 for j in result2: sum2 += int(j) if sum1 == sum2: print (i, sum1) count += 1 finish = time.clock() print ("Project Euler, Project 290") print () print ("Answer:", count) print ("Time:", stringifytime(finish - start))

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  • Which python mpi library to use?

    - by Dana the Sane
    I'm starting work on some simulations using MPI and want to do the programming in Python/scipy. The scipy site lists a number of mpi libraries, but I was hoping to get feedback on quality, ease of use, etc from anyone who has used one.

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  • Get CGI Fields from URL Python

    - by user299196
    When using the cgi module in Python, I can't seem to figure out how to extract CGI variables in the URL. For example if the url servercgi.py?name=user , how do I get 'name' after import cgi? For some reason, form.getvalue and form['user'] do not work but if I print the object, I see something like FieldStorage(None, None, [MiniFieldStoreage('name', 'user')]).

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  • Type derivation in python?

    - by aXqd
    In Perl, I can do this: push(@{$h->[x]}, y); Can I simplify the following python codes according to above Perl example? if x not in h: h[x] = [] h[x].append(y) I want to simplify this, because it goes many places in my code, (and I cannot initialize all possible x with []). I do not want to make it a function, because there is no 'inline' keyword. Any ideas?

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  • Python: Cannot concatenate str and NoneType objects

    - by Chase Higgins
    sql = """ INSERT INTO [SCHOOLINFO] VALUES( '""" + self.accountNo + """', '""" + self.altName + """', '""" + self.address1 + """', '""" + self.address2 + """', '""" + self.city + """', '""" + self.state + """', '""" + self.zipCode + """', '""" + self.phone1 + """', '""" + self.phone2 + """', '""" + self.fax + """', '""" + self.contactName + """', '""" + self.contactEmail + """', '""" + self.prize_id + """', '""" + self.shipping + """', '""" + self.chairTempPass + """', '""" + self.studentCount + """' ) """; I have the following code and Python keeps throwing the error that it cannon concatenate strings and nonetype objects. The thing is I have verified every variable here is in fact a string and is not null. I have been stuck on this for quite some time today, and any help would be greatly appreciated.

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  • Launch a webpage on a Firefox (win) tab using Python

    - by Leandro Ardissone
    Hi, I'm trying to launch a website url in a new tab using python in that way, but it didn't worked in these both ways: Method 1: os.system('C:\Program Files\Mozilla Firefox\Firefox.exe -new-tab http://www.google.com/'); and Method 2: os.startfile('C:\Program Files\Mozilla Firefox\Firefox.exe -new-tab http://www.google.com/'); If I don't add the parameters (-new-tab http://www.google.com/) it works, opening the default page.

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  • Using python to write text files with DOS line endings on linux

    - by gaumann
    I want to write text files with DOS/Windows line endings '\r\n' using python running on Linux. It seems to me that there must be a better way than manually putting a '\r\n' at the end of every line or using a line ending conversion utility. Ideally I would like to be able to do something like assign to os.linesep the separator that I want to use when writing the file. Or specify the line separator when I open the file.

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  • Japanese in python function

    - by ha22109
    Hello All, I wrote a function in python which is used to tell me whether the two words are similar or not. but now i want to pass japanese text in my same function.It is giving error not a ascii character.I tried using utf -8 ecoding, but then it giving the same error Non-ASCII character '\xe3' in file Is there any way to do that.I cant generate the msg file for that since the 2 keyword will be not be constant.

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  • Python - Get Instance Variables

    - by Chris Bunch
    Is there a built-in method in Python to get an array of all a class' instance variables? For example, if I have this code: class hi: def __init__(self): self.ii = "foo" self.kk = "bar" Is there a way for me to do this: >>> mystery_method(hi) ["ii", "kk"] Thanks guys! Edit: I originally had asked for class variables erroneously. Thanks to all who brought this to my attention!

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  • Reading a MIDI file in Python

    - by Logan
    I want to be able to read events from a MIDI file in Python. I have looked for libraries, but can't find one that works with my MIDI file in windows. I do not need to do anything real time, and just want a simple library that gives me events and times. Would it be easier to write one for myself? Any help would be appreciated.

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