checking 'type' programmatically
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 %s<br>' % type(se))
req.write('stderr class %s<br>' % 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
exa...@twistedmatrix.com
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
Billy Earney
if isinstance(obj, str):
print "object is a string.."
elif isinstance(obj, int):
print "object is an integer.."
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