Convert exception error to string
<p>I want to work with the error message from an exception but can't seem to convert it to a string.  I've read the os library man page but something is not clicking for me.</p>

<p>Printing the error works:</p>

<pre><code>try:
    os.open("test.txt", os.O_RDONLY)
except OSError as err:
    print ("I got this error: ", err)
</code></pre>

<p>But this does not:</p>

<pre><code>try:
    os.open("test.txt", os.O_RDONLY)
except OSError as err:
    print ("I got this error: " + err)

TypeError: Can't convert 'FileNotFoundError' object to str implicitly
</code></pre>