The following code illustrates the problem. Essentially print str(MongoClient) returns the expected output but the HOST and PORT properties do not.

from pymongo import MongoClient

c = MongoClient("localhost", 27017)
print c
print c.HOST
print str(c.PORT)
c.close()

c = MongoClient("mongodb://localhost:30001/test")
print c
print c.HOST
print str(c.PORT)

c = MongoClient("localhost.localdomain", 30001)
print c
print c.HOST
print str(c.PORT)

c = MongoClient(host="localhost", port=30001)
print c
print c.HOST
print str(c.PORT)

Output is as follows...

<pre>
MongoClient('localhost', 27017)
localhost
27017
MongoClient('localhost', 30001)
localhost
27017
MongoClient('localhost.localdomain', 30001)
localhost
27017
MongoClient('localhost', 30001)
localhost
27017
</pre>