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Date: Sat, 8 Mar 2014 09:55:35 -0700
Subject: Re: How to extract contents of inner text of html tag?
From: Jason Friedman <jsf80238@gmail.com>
To: "Golam Md. Shibly" <shiblydu60@yahoo.com>
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Xref: csiph.com comp.lang.python:68045

> for line in all_kbd:
>    if line.string == None:

I modified your code slightly:
for line in all_kbd:
    print(line)
    sys.exit()
    if line.string == None:

Running the new script yields:
$ python shibly.py
<kbd class="command">
    cp -v --remove-destination /usr/share/zoneinfo/
    <em class="replaceable"><code><xxx></xxx></code></em>
       \
    /etc/localtime
</kbd>

Meaning that
all_kbd=soup.find_all('kbd')

yields only a single string, not multiple strings as I'm guessing you expected.

You might also consider running your program as:

python -m pdb your_program.py