Fix imports + subparsers in python3

bmc.py

@@ -433,7 +433,8 @@ def update(entry):
 if __name__ == '__main__':
     parser = argparse.ArgumentParser(description="A bibliography " +
                                      "management tool.")
-    subparsers = parser.add_subparsers(help="sub-command help")
+    subparsers = parser.add_subparsers(help="sub-command help", dest='parser')
+    subparsers.required = True  # Fix for Python 3.3.5
 
     parser_download = subparsers.add_parser('download', help="download help")
     parser_download.add_argument('-t', '--type', default=None,

libbmc/fetcher.py

@@ -24,12 +24,13 @@ except ImportError:
     # Fall back to Python 2's urllib2
     from urllib2 import urlopen, URLError
 import arxiv2bib as arxiv_metadata
-import tools
+import libbmc.tools
 from bibtexparser.bparser import BibTexParser
-from config import Config
+from libbmc.config import Config
 
 
 config = Config()
+default_socket = socket.socket
 
 
 def download(url):
@@ -51,13 +52,16 @@ def download(url):
             except ValueError:
                 port = None
             socks.set_default_proxy(proxy_type, proxy, port)
-        else: # TODO : Reset if proxy is empty
+            socket.socket = socks.socksocket
+        elif proxy == '':
+            socket.socket = default_socket
+        else:
             try:
                 proxy, port = proxy.split(':')
             except ValueError:
                 port = None
             socks.set_default_proxy(socks.HTTP, proxy, port)
-        socket.socket = socks.socksocket
+            socket.socket = socks.socksocket
         try:
             r = urlopen(url)
             size = int(r.headers.getheader('content-length').strip())