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From: Peng Yu on 22 Jun 2010 11:53
Hi,

It seems I don't completely understand how getsource works, as I
expect that I should get the source code of class A. But I don't.
Would you please let me know what I am wrong?

$ cat main.py
#!/usr/bin/env python

import inspect

class A:
pass

a=A()

print inspect.getsource(a)

$ ./main.py
Traceback (most recent call last):
File "./main.py", line 10, in <module>
print inspect.getsource(a)
File "/home/pengy/utility/linux/opt/Python-2.6.5/lib/python2.6/inspect.py",
line 689, in getsource
lines, lnum = getsourcelines(object)
File "/home/pengy/utility/linux/opt/Python-2.6.5/lib/python2.6/inspect.py",
line 678, in getsourcelines
lines, lnum = findsource(object)
File "/home/pengy/utility/linux/opt/Python-2.6.5/lib/python2.6/inspect.py",
line 519, in findsource
file = getsourcefile(object) or getfile(object)
File "/home/pengy/utility/linux/opt/Python-2.6.5/lib/python2.6/inspect.py",
line 441, in getsourcefile
filename = getfile(object)
File "/home/pengy/utility/linux/opt/Python-2.6.5/lib/python2.6/inspect.py",
line 418, in getfile
raise TypeError('arg is not a module, class, method, '
TypeError: arg is not a module, class, method, function, traceback,
frame, or code object


--
Regards,
Peng
From: James Mills on 22 Jun 2010 12:00
On Wed, Jun 23, 2010 at 1:53 AM, Peng Yu <pengyu.ut(a)gmail.com> wrote:
> It seems I don't completely understand how getsource works, as I
> expect that I should get the source code of class A. But I don't.
> Would you please let me know what I am wrong?

If you "read" the documentation carefully:

"""
getsource(object)
Return the text of the source code for an object.

The argument may be a module, class, method, function, traceback, frame,
or code object. The source code is returned as a single string. An
IOError is raised if the source code cannot be retrieved.
"""

This "does not" include an object / instance (whichever you prefer).

$ python main.py
class A:
pass


$ cat main.py
import inspect

class A:
pass

a=A()

print inspect.getsource(a.__class__)

cheers
James

--
--
-- "Problems are solved by method"
From: Ian Kelly on 22 Jun 2010 12:01
On Tue, Jun 22, 2010 at 9:53 AM, Peng Yu <pengyu.ut(a)gmail.com> wrote:
> Hi,
>
> It seems I don't completely understand how getsource works, as I
> expect that I should get the source code of class A. But I don't.
> Would you please let me know what I am wrong?
>
> $ cat main.py
> #!/usr/bin/env python
>
> import inspect
>
> class A:
>  pass
>
> a=A()
>
> print inspect.getsource(a)

You passed in an instance of the class, not the class itself. The
following will work:

print inspect.getsource(A)

As will:

print inspect.getsource(a.__class__)

Cheers,
Ian
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