checking 'type' programmatically

2009-11-20 Thread mk 


Disclaimer: this is for exploring and debugging only. Really.

I can check type or __class__ in the interactive interpreter:

Python 2.6.2 (r262:71600, Jun 16 2009, 16:49:04)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-44)] on linux2
Type help, copyright, credits or license for more information.
 import subprocess
 
p=subprocess.Popen(['/bin/ls'],stdout=subprocess.PIPE,stderr=subprocess.PIPE)

 p
subprocess.Popen object at 0xb7f2010c
 (so, se) = p.communicate()
 so
'abc.txt\nbak\nbox\nbuild\ndead.letter\nDesktop\nhrs\nmbox\nmmultbench\nmmultbench.c\npyinstaller\nscreenlog.0\nshutdown\ntaddm_import.log\nv2\nvm\nworkspace\n'
 se
''
 so.__class__
type 'str'
 type(so)
type 'str'
 type(se)
type 'str'

But when I do smth like this in code that is ran non-interactively (as 
normal program):


req.write('stderr type %sbr' % type(se))
req.write('stderr class %sbr' % str(se.__class__))

then I get empty output. WTF?

How do I get the type or __class__ into some object that I can display?


Why do that: e.g. if documentation is incomplete, e.g. documentation on 
Popen.communicate() says communicate() returns a tuple (stdoutdata, 
stderrdata) but doesn't say what is the class of stdoutdata and 
stderrdata (a file object to read? a string?).


Regards,
mk



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Re: checking 'type' programmatically

2009-11-20 Thread exarkun 

On 10:10 am, mrk...@gmail.com wrote:


Disclaimer: this is for exploring and debugging only. Really.

I can check type or __class__ in the interactive interpreter:

Python 2.6.2 (r262:71600, Jun 16 2009, 16:49:04)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-44)] on linux2
Type help, copyright, credits or license for more information.
 import subprocess
 
p=subprocess.Popen(['/bin/ls'],stdout=subprocess.PIPE,stderr=subprocess.PIPE)

 p
subprocess.Popen object at 0xb7f2010c
 (so, se) = p.communicate()
 so
'abc.txt\nbak\nbox\nbuild\ndead.letter\nDesktop\nhrs\nmbox\nmmultbench\nmmultbench.c\npyinstaller\nscreenlog.0\nshutdown\ntaddm_import.log\nv2\nvm\nworkspace\n'
 se
''
 so.__class__
type 'str'
 type(so)
type 'str'
 type(se)
type 'str'

But when I do smth like this in code that is ran non-interactively (as 
normal program):


req.write('stderr type %sbr' % type(se))
req.write('stderr class %sbr' % str(se.__class__))

then I get empty output. WTF?

How do I get the type or __class__ into some object that I can display?


Hooray for HTML.

You asked a browser to render stderr type type 'str'br.  This 
isn't valid HTML, so pretty much any behavior goes.  In this case, the 
browser seems to be discarding the entire type 'str' - not too 
suprising, as it has some features in common with an html tag.


Try properly quoting your output (perhaps by generating your html with a 
real html generation library).


Jean-Paul
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RE: checking 'type' programmatically

2009-11-20 Thread Billy Earney 
Try looking at the function 'isinstance', so for example

if isinstance(obj, str):
print object is a string..
elif isinstance(obj, int):
print object is an integer.. 

-Original Message-
From: python-list-bounces+billy.earney=gmail@python.org
[mailto:python-list-bounces+billy.earney=gmail@python.org] On Behalf Of
mk
Sent: Friday, November 20, 2009 4:10 AM
To: python-list@python.org
Subject: checking 'type' programmatically


Disclaimer: this is for exploring and debugging only. Really.

I can check type or __class__ in the interactive interpreter:

Python 2.6.2 (r262:71600, Jun 16 2009, 16:49:04)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-44)] on linux2
Type help, copyright, credits or license for more information.
  import subprocess
  
p=subprocess.Popen(['/bin/ls'],stdout=subprocess.PIPE,stderr=subprocess.PIPE
)
  p
subprocess.Popen object at 0xb7f2010c
  (so, se) = p.communicate()
  so
'abc.txt\nbak\nbox\nbuild\ndead.letter\nDesktop\nhrs\nmbox\nmmultbench\nmmul
tbench.c\npyinstaller\nscreenlog.0\nshutdown\ntaddm_import.log\nv2\nvm\nwork
space\n'
  se
''
  so.__class__
type 'str'
  type(so)
type 'str'
  type(se)
type 'str'

But when I do smth like this in code that is ran non-interactively (as 
normal program):

req.write('stderr type %sbr' % type(se))
req.write('stderr class %sbr' % str(se.__class__))

then I get empty output. WTF?

How do I get the type or __class__ into some object that I can display?


Why do that: e.g. if documentation is incomplete, e.g. documentation on 
Popen.communicate() says communicate() returns a tuple (stdoutdata, 
stderrdata) but doesn't say what is the class of stdoutdata and 
stderrdata (a file object to read? a string?).

Regards,
mk



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