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Can not find a specific regular expressions

I am trying to scrap specific information from the site but I am receiving an error. Here is the simplified version of the main problem:
import re
b='href="/bp/vendor?vendorCodes=C901U">C901U</a></span></div></div></div><div heyaa'
c=re.search('href="/bp/vendor?vendorCodes=C901U">C901U</a></span></div></div></div><div',b)
If I try to find what is in c I receive this error:
c.group()
Traceback (most recent call last):
File "<pyshell#87>", line 1, in <module>
c.group()
AttributeError: 'NoneType' object has no attribute 'group'
Thanks in advance.

Not able to open and load pickle file in python 3.6.1

I am trying to open and load pickle file but by two ways. But every time I am getting an error.
Request you to please help.
First way :
enron_data = pickle.load(open("D:/New/ud120-projects/final_project/final_project_dataset.pkl", "r"))
Error: Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: a bytes-like object is required, not 'str'
Second Way :
enron_data = pickle.load(open("D:/New/ud120-projects/final_project/final_project_dataset.pkl", "rb"))
Error : Traceback (most recent call last):
File "<stdin>", line 1, in <module>
_pickle.UnpicklingError: the STRING opcode argument must be quoted
Request you to please help

If you are on Windows you have to use a raw string and backslashes like this:
r'D:\path\to\your\file'

AttributeError: 'module' object has no attribute 'DrtParser'

I already checked all similar thread, but no help.
>>> from nltk import load_parser
>>> parser = load_parser('grammars/book_grammars/drt.fcfg', logic_parser=nltk.sem.drt.DrtParser())
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'DrtParser'
code is given at : http://www.nltk.org/book/ch10.html just above 5.2
>>> print nltk.sem.drt
<module 'nltk.sem.drt' from '/usr/local/lib/python2.7/dist-packages/nltk/sem/drt.pyc'>
what can be the issue?
/nltk/sem has drt.py and drt.pyc files

Pydoc not working in Python 3.3 in Windows

I am trying to generate the help text at runtime and i am not able to use the pydoc command in Windows. When i type
>>> pydoc(atexit)
Traceback (most recent call last):
File "<console>", line 1, in <module>
NameError: name 'pydoc' is not defined
I have already set up the environment variables for pydoc.py file. C:\Python33\Lib\pydoc.py.
This also not works like it works for >>help('atexit')
>>> pydoc('atexit')
Traceback (most recent call last):
File "<console>", line 1, in <module>
NameError: name 'pydoc' is not defined
Whats the possible reason for it.
Updates:
>>> import pydoc
>>> pydoc(sys)
Traceback (most recent call last):
File "<console>", line 1, in <module>
TypeError: 'module' object is not callable
>>> pydoc('sys')
Traceback (most recent call last):
File "<console>", line 1, in <module>
TypeError: 'module' object is not callable

Like any library in Python, you need to import it before you can use it.
Edit What exactly are you trying to achieve? Modules are indeed not callable. pydoc.help is the function you want, although I don't really know why you need it, since as you note the standalone help function does the same thing already.

"argument 1 has unexpected type 'str'"

I'm trying to use PyKDE, PyKDE.kdecore.KStandardDirs to be precise. This method is called with two strings according to the documentation and according to the PyQt4 documentation, I can use standard Python strs instead of QString.
This doesn't work:
>> KStandardDirs.locate()("socket", "foo")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: KStandardDirs.locate(): not enough arguments
>>> KStandardDirs.locate("socket", "foo")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: KStandardDirs.locate(): argument 1 has unexpected type 'str'
I can't use QString either because it doesn't seem to exist:
>>> from PyQt4.QtCore import QString
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: cannot import name QString
>>> from PyQt4.QtCore import *
>>> QString
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'QString' is not defined
What am I doing wrong?

I suspect that PyKDE is not yet Python 3 ready, at least as far as that error message is concerned; try passing in a bytestring instead:
KStandardDirs.locate(b"socket", "foo")