Re: [google-appengine] Get file size with Python

[Takashi Matsuo]

Hi Phát,

Can you show us the actual code and the error message please :)

-- Takashi

On Sat, Sep 29, 2012 at 7:05 PM, Phát Trần <phat...@gmail.com> wrote:

I try to get file size with os.path("asd.txt")

But I cann't. Don't know why. Any help?

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Takashi Matsuo | Developers Advocate | tma...@google.com

[GregF]

Appengine does not give you access to the filesystem. You will need to use either the datastore or the blobstore to store local information.

Cheers!
Greg.

[Gopal Patel]

It prohibits "writing". It allows reading anyway you want.

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[Phát Trần]

So use we use read file. And how can we know its size

Vào 10:58:48 UTC+7 Thứ hai, ngày 01 tháng mười năm 2012, gops đã viết:

[Takashi Matsuo]

import os

size = os.stat(filename).st_size

# or

size = os.path.getsize(filename)

Does one of these work for you?

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[Phát Trần]

I tried but it's not work.

Vào 12:02:56 UTC+7 Thứ hai, ngày 01 tháng mười năm 2012, Takashi Matsuo (Google) đã viết:

[Geoffrey Spear]

What does "does not work" mean? Where's the code you're running? Where's the output, or the traceback?

[Phát Trần]

I use 

import os

print(os.path.getsize("abc.txt"))

Ane I got the log:

WARNING  2012-10-01 12:16:13,943 dev_appserver_import_hook.py:595] Blocking access to static file ".....\abc.txt"

ERROR    2012-10-01 12:16:13,944 wsgi.py:203] 

Traceback (most recent call last):

  File "C:\Program Files\Google\google_appengine\google\appengine\runtime\wsgi.py", line 195, in Handle

    handler = _config_handle.add_wsgi_middleware(self._LoadHandler())

  File "C:\Program Files\Google\google_appengine\google\appengine\runtime\wsgi.py", line 239, in _LoadHandler

    handler = __import__(path[0])

  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_import_hook.py", line 719, in Decorate

    return func(self, *args, **kwargs)

  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_import_hook.py", line 1923, in load_module

    return self.FindAndLoadModule(submodule, fullname, search_path)

  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_import_hook.py", line 719, in Decorate

    return func(self, *args, **kwargs)

  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_import_hook.py", line 1787, in FindAndLoadModule

    description)

  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_import_hook.py", line 719, in Decorate

    return func(self, *args, **kwargs)

  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_import_hook.py", line 1730, in LoadModuleRestricted

    description)

  File "D:\vangvn-igold\size.py", line 18, in <module>

    print(os.path.getsize("abc.txt"))

  File "C:\Python27\lib\genericpath.py", line 49, in getsize

    return os.stat(filename).st_size

  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_import_hook.py", line 663, in __call__

    raise OSError(errno.EACCES, 'path not accessible', path)

OSError: [Errno 13] path not accessible: 'abc.txt'

[Geoffrey Spear]

Your file is specified in app.yaml as a static file; these files are not accessible by the application; they're uploaded to a completely different place from your application code, and are meant to only be served directly to your users' browsers, not accessed in your code. dev_appserver blocks access to them to mimic what you'd see on the production server.

If this file is not meant to ever be served directly to users, change app.yaml so it's no longer static. If you need to both serve it to users and access it in program code, you'll need 2 copies of it (or a symbolic link to it, although I'm not sure how this works on Windows), one of which is static and one of which isn't, probably in different directories.