Re: [Tutor] Determine Filetype
Thankyou guys. The search feature of the web site is quite effective! :-) Alan, i know that every site has a search function, but they're not so simple to be used if you're looking for a very common word (in) and don't know other keys to find it. Regards, Giorgio ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Determine Filetype
Hi All,
the solution was in the link i've posted before. If i use:
type = imghdr.what('img.test', image.data)
The imghdr modules ignore the filename (first argument) and takes the
second as a data stream assumed to contain the filetype.
The solution only works for images, but that's what i need. I think
that right now is not possible to generally determine the mimetype for
all types of files on GAE, because some libraries are missing. Anyway,
i'll send a mail to the gae mailing list, and if find a solution i'll
post it here.
Thankyou all guys.
2009/9/19 Sander Sweers sander.swe...@gmail.com:
On Fri, 2009-09-18 at 16:48 -0400, Kent Johnson wrote:
So, the __init__.py file of the GAE evinronment's ctypes library is
broken, as it's importing from a package that doesn't exist. Right?
Probably ctypes is not supported in GAE, that would be a pretty big
security hole.
There is a pure python implementation on pypi [1]. It states it is in
alpha and missing some features. Never used it myself though...
Greets
Sander
[1] http://pypi.python.org/pypi/pymagic/0.1
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Re: [Tutor] Determine Filetype
Ops, i have another question, it seems very simple.
I want to check the extension of an uploaded file. So i've created a
list with allowed extensions:
enabled_ext = ['gif', 'jpeg', 'png', 'bmp', 'tiff']
How can i create a simple if that check if the file ext (file_ext) is
in the list?
I've searched in the python tutorial, but have not been able to find
any example that uses an if statement combined with a list.
Thankyou again
2009/9/19 ad...@gg-lab.net ad...@gg-lab.net:
Hi All,
the solution was in the link i've posted before. If i use:
type = imghdr.what('img.test', image.data)
The imghdr modules ignore the filename (first argument) and takes the
second as a data stream assumed to contain the filetype.
The solution only works for images, but that's what i need. I think
that right now is not possible to generally determine the mimetype for
all types of files on GAE, because some libraries are missing. Anyway,
i'll send a mail to the gae mailing list, and if find a solution i'll
post it here.
Thankyou all guys.
2009/9/19 Sander Sweers sander.swe...@gmail.com:
On Fri, 2009-09-18 at 16:48 -0400, Kent Johnson wrote:
So, the __init__.py file of the GAE evinronment's ctypes library is
broken, as it's importing from a package that doesn't exist. Right?
Probably ctypes is not supported in GAE, that would be a pretty big
security hole.
There is a pure python implementation on pypi [1]. It states it is in
alpha and missing some features. Never used it myself though...
Greets
Sander
[1] http://pypi.python.org/pypi/pymagic/0.1
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Re: [Tutor] Determine Filetype
if file_ext in enabled_ext
Found an example some seconds ago in another mailing lists. I'm not
able to find the python tutorial that describes this statement. Can
you help me please?
2009/9/19 ad...@gg-lab.net ad...@gg-lab.net:
Ops, i have another question, it seems very simple.
I want to check the extension of an uploaded file. So i've created a
list with allowed extensions:
enabled_ext = ['gif', 'jpeg', 'png', 'bmp', 'tiff']
How can i create a simple if that check if the file ext (file_ext) is
in the list?
I've searched in the python tutorial, but have not been able to find
any example that uses an if statement combined with a list.
Thankyou again
2009/9/19 ad...@gg-lab.net ad...@gg-lab.net:
Hi All,
the solution was in the link i've posted before. If i use:
type = imghdr.what('img.test', image.data)
The imghdr modules ignore the filename (first argument) and takes the
second as a data stream assumed to contain the filetype.
The solution only works for images, but that's what i need. I think
that right now is not possible to generally determine the mimetype for
all types of files on GAE, because some libraries are missing. Anyway,
i'll send a mail to the gae mailing list, and if find a solution i'll
post it here.
Thankyou all guys.
2009/9/19 Sander Sweers sander.swe...@gmail.com:
On Fri, 2009-09-18 at 16:48 -0400, Kent Johnson wrote:
So, the __init__.py file of the GAE evinronment's ctypes library is
broken, as it's importing from a package that doesn't exist. Right?
Probably ctypes is not supported in GAE, that would be a pretty big
security hole.
There is a pure python implementation on pypi [1]. It states it is in
alpha and missing some features. Never used it myself though...
Greets
Sander
[1] http://pypi.python.org/pypi/pymagic/0.1
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Re: [Tutor] Determine Filetype
2009/9/19 Sander Sweers sander.swe...@gmail.com:
On Sat, 2009-09-19 at 17:20 +0200, ad...@gg-lab.net wrote:
I want to check the extension of an uploaded file. So i've created a
list with allowed extensions:
enabled_ext = ['gif', 'jpeg', 'png', 'bmp', 'tiff']
If this does not change make it s tuple. It does not change what is
written below.
How can i create a simple if that check if the file ext (file_ext) is
in the list?
The below idle session should help you figure it out.
enabled_ext = ('gif', 'jpeg', 'png', 'bmp', 'tiff')
'gif' in enabled_ext
True
Greets
Sander
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
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Sander, sorry for the top-posting, it's the default in GMail. This is
one of my first times in a mailing list, so it's possible i'm doing
something wrong. Sorry again for it.
I've replied to my mail, as i've found what i was looking for:
if OBJECT in LIST:
Well, but i'd like to read the page of the python tutorial regarding
this. I'm not able to locate it. Can you help me?
Thankyou
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[Tutor] Determine Filetype
Hi, i'm putting file in a DB as BLOB entries. To serve them, i need to take Content-Type headers. So, i'm looking for a function that returnes the filetype, given a data str. I've found many other topics like this in python mail-archive, but any of them contains the solution. Can you help me, please? Thankyou! ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Determine Filetype
Hi Emile, that functions requires a filename/path. Just like this one (for images) http://docs.python.org/library/imghdr.html Ok, i don't have a filename. I get the file from a BLOB in a db. Any idea? Thankyou for your precious help. 2009/9/18 Emile van Sebille em...@fenx.com: On 9/18/2009 10:05 AM ad...@gg-lab.net said... Hi, i'm putting file in a DB as BLOB entries. To serve them, i need to take Content-Type headers. So, i'm looking for a function that returnes the filetype, given a data str. I've found many other topics like this in python mail-archive, but any of them contains the solution. Can you help me, please? I'd take a look at python-magic at http://hupp.org/adam/hg/python-magic/file/d3cd83e5a773 where the example shows that you can do: # For MIME types mime = magic.Magic(mime=True) mime.from_file(testdata/test.pdf) 'application/pdf' HTH, Emile Thankyou! ___ Tutor maillist - tu...@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - tu...@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Determine Filetype
Oh, i'm sorry. I've read the README, but haven't noticed that m.from_buffer(open(testdata/test.pdf).read(1024)) was exactly what i was looking for. Ok, i'll try it and let you know :D 2009/9/18 Kent Johnson ken...@tds.net: On Fri, Sep 18, 2009 at 2:21 PM, ad...@gg-lab.net ad...@gg-lab.net wrote: Hi Emile, that functions requires a filename/path. Did you even look at the link? There is a from_buffer() method also. Kent 2009/9/18 Emile van Sebille em...@fenx.com: I'd take a look at python-magic at http://hupp.org/adam/hg/python-magic/file/d3cd83e5a773 where the example shows that you can do: # For MIME types mime = magic.Magic(mime=True) mime.from_file(testdata/test.pdf) 'application/pdf' ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Determine Filetype
Ok, a good news for me: i've modified my script, adding a: import magic line at the top of it. But I got this error: No module named magic Ok, so magic is not installed on GAE. I've then uploaded it and it loaded succesfully. New error: No module named _ctypes And, reading the full debug i got this: File /base/python_dist/lib/python2.5/ctypes/__init__.py, line 10, in module from _ctypes import Union, Structure, Array So, the __init__.py file of the GAE evinronment's ctypes library is broken, as it's importing from a package that doesn't exist. Right? Maybe i'm doing something wrong. Thankyou 2009/9/18 ad...@gg-lab.net ad...@gg-lab.net: Oh, i'm sorry. I've read the README, but haven't noticed that m.from_buffer(open(testdata/test.pdf).read(1024)) was exactly what i was looking for. Ok, i'll try it and let you know :D 2009/9/18 Kent Johnson ken...@tds.net: On Fri, Sep 18, 2009 at 2:21 PM, ad...@gg-lab.net ad...@gg-lab.net wrote: Hi Emile, that functions requires a filename/path. Did you even look at the link? There is a from_buffer() method also. Kent 2009/9/18 Emile van Sebille em...@fenx.com: I'd take a look at python-magic at http://hupp.org/adam/hg/python-magic/file/d3cd83e5a773 where the example shows that you can do: # For MIME types mime = magic.Magic(mime=True) mime.from_file(testdata/test.pdf) 'application/pdf' ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Still Trying to Understand GAE
Thankyou all, you're very precious for me. yeah it seems the development webserver (and the production one) are importing modules in a non-standard way. I absolutely don't understand this choice. Why import everything everytime? Don't you think it makes scripts much more slow? Giorgio 2009/9/16 Kent Johnson ken...@tds.net: On Sun, Sep 13, 2009 at 9:59 AM, ad...@gg-lab.net ad...@gg-lab.net wrote: Hi All, i've started earning python sone months ago (on Google App Engine unfortunately). I have some doubts reagrding import, and have asked a similar question here months ago, but without finding a solution. So: with import i can import modules or single functions. And this is ok. Then: as i have understood from all the books i readm in each package directory i have the __init__.py file that decides what import with it. In other words if my package skel is like: /gg/ /gg/sub1/ /gg/sub1/file.py /gg/sub2/ /gg/sub2/file.py and i use import gg, nothing is imported. To import sub1 and sub2, i can: - Put in /gg/ a __init__.py file that tells to import them - Use from gg import sub1 Ok now the $1 Billion question: google app engine has the same schema than my gg package, an empty __init__.py file, but if i use import google it also imports all subdirectories. And i can't understand wiìhy it does so. In general, import foo does not import subpackages of foo unless they are specifically imported in foo/__init__.py, so dir(foo) will not show the subpackages. However if you import foo import foo.bar then dir(foo) will include 'bar'. Here is an example from the std lib: In [1]: import distutils In [2]: dir(distutils) Out[2]: ['__builtins__', '__doc__', '__file__', '__name__', '__package__', '__path__', '__revision__', '__version__'] In [3]: import distutils.cmd In [4]: dir(distutils) Out[4]: ['__builtins__', '__doc__', '__file__', '__name__', '__package__', '__path__', '__revision__', '__version__', 'archive_util', 'cmd', 'dep_util', 'dir_util', 'errors', 'file_util', 'log', 'spawn', 'util'] My guess is that the startup for GAE is importing the subpackages so they then appear as imported modules. To access your sub-package, just import it normally. Kent ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Still Trying to Understand GAE
Yes Kent, i'm not worrying about it, i was just trying to find the reason why they're doing so. Anyway, i'm a newbye, but the GAE Evinronment is very very difficult to understand. The only thing is thas in common with the real python is the sintax. Thankyou again 2009/9/17 Kent Johnson ken...@tds.net: On Thu, Sep 17, 2009 at 8:38 AM, ad...@gg-lab.net ad...@gg-lab.net wrote: Thankyou all, you're very precious for me. yeah it seems the development webserver (and the production one) are importing modules in a non-standard way. I absolutely don't understand this choice. Why import everything everytime? Don't you think it makes scripts much more slow? My guess is that they are importing what they need. It does impact startup but hey, if you need it, you need it. Try this for comparison: Start Python from a command line, then In [5]: import sys In [6]: len(sys.modules) Out[6]: 323 I have IPython loaded so this number may be larger than yours. In Python 3, with no IPython, I get import sys len(sys.modules) 47 So my advice is, don't worry about it. Kent ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Still Trying to Understand GAE
Hi Wesley! Thankyou very much for your mail (and i'd like to thankyou in a special way for your corrections :) ). it imports all sub*packages*. don't think directories because the import mechanism doesn't work this way. this is likely because there are __init__.py files in those subdirectories. another possibility is that there are non-empty __init__.py files that do the imports of things that you're not expecting. Ok, i've checked all those files, because in a standard python evinronment the __init__.py is the only file that can decide what to import. If you want to check directly, here you can find the SDK. Just open the google directory. http://googleappengine.googlecode.com/files/google_appengine_1.2.5.zip As i've said, this simple script: --- #!/usr/bin/python import google print Content-Type: text/html print print head print /head print body print google,dir(google) print /br print /br print /body --- Gives this output: google ['__builtins__', '__doc__', '__file__', '__name__', '__package__', '__path__', 'appengine', 'net', 'pyglib'] The google directoy has an empty __init__.py file (well, if we want to be completely correct it contains some commented -#- lines). Same for appengine, net and pyglib. As they all have an __init__.py file, they should be consiedered as modules from the python interpreter. So, if i run import google it imports all google's submodules. Well, now, the problem: if i create another directory (module) in the google dir, it doesn't get imported. Of course i've put in it some .py files and an empty __init__.py file. Thankyou again! Giorgio 2009/9/13 wesley chun wes...@gmail.com: hi Giorgio, welcome to Python (whether directly or from GAE!) :-) my comments below. with import i can import modules or single functions. And this is ok. not quite true. regardless of whether you use import or from-import, you're *always* importing (and loading) modules or packages in their entirety. now, whether you have *access* to entire modules/packages or individual attributes (functions, classes, or standard data), is another matter -- usually this is a result of using from-import. also, the difference between importing and loading is that loading only happens the first time you import a module/package. (if you do it more than once, e.g., module A imports B and C and module B also imports C, the import of C happens twice but the loading happens only once. if i use import google it also imports all subdirectories. And i can't understand wiìhy it does so. it imports all sub*packages*. don't think directories because the import mechanism doesn't work this way. this is likely because there are __init__.py files in those subdirectories. another possibility is that there are non-empty __init__.py files that do the imports of things that you're not expecting. hope this helps! -- wesley - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Core Python Programming, Prentice Hall, (c)2007,2001 Python Fundamentals, Prentice Hall, (c)2009 http://corepython.com wesley.j.chun :: wescpy-at-gmail.com python training and technical consulting cyberweb.consulting : silicon valley, ca http://cyberwebconsulting.com ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Still Trying to Understand GAE
Hi All, i've started earning python sone months ago (on Google App Engine unfortunately). I have some doubts reagrding import, and have asked a similar question here months ago, but without finding a solution. So: with import i can import modules or single functions. And this is ok. Then: as i have understood from all the books i readm in each package directory i have the __init__.py file that decides what import with it. In other words if my package skel is like: /gg/ /gg/sub1/ /gg/sub1/file.py /gg/sub2/ /gg/sub2/file.py and i use import gg, nothing is imported. To import sub1 and sub2, i can: - Put in /gg/ a __init__.py file that tells to import them - Use from gg import sub1 Ok now the $1 Billion question: google app engine has the same schema than my gg package, an empty __init__.py file, but if i use import google it also imports all subdirectories. And i can't understand wiìhy it does so. Can you help me? Thankyou Giorgio ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
