diff --git a/tests/config.py b/tests/config.py
index 0bac30f..5475552 100644
--- a/tests/config.py
+++ b/tests/config.py
@@ -4,7 +4,7 @@ sys.path = ['../',] + sys.path
 from trezorlib.transport_pipe import PipeTransport
 from trezorlib.transport_hid import HidTransport
 from trezorlib.transport_socket import SocketTransportClient
-from trezorlib.transport_bridge import BridgeTransport
+#from trezorlib.transport_bridge import BridgeTransport
 
 devices = HidTransport.enumerate()
 
diff --git a/trezorlib/client.py b/trezorlib/client.py
index 1ac90cd..7d16542 100644
--- a/trezorlib/client.py
+++ b/trezorlib/client.py
@@ -7,14 +7,17 @@ import unicodedata
 import json
 import getpass
 
-import tools
-import mapping
-import messages_pb2 as proto
-import types_pb2 as types
-import protobuf_json
-from debuglink import DebugLink
 from mnemonic import Mnemonic
 
+from . import tools
+from . import mapping
+from . import messages_pb2 as proto
+from . import types_pb2 as types
+from .debuglink import DebugLink
+
+if sys.version_info[0] == 3:
+    from io import BytesIO
+    unicode = lambda s, enc: BytesIO(bytes(s, enc))
 
 # try:
 #     from PIL import Image
@@ -44,7 +47,7 @@ def pprint(msg):
     if isinstance(msg, proto.FirmwareUpload):
         return "<%s> (%d bytes):\n" % (msg_class, msg_size)
     else:
-        return "<%s> (%d bytes):\n%s" % (msg_class, msg_size, msg)
+        return "<%s> (%d bytes):\n%s" % (msg_class, msg_size, '#FIXME') # msg)
 
 def log(msg):
     sys.stderr.write("%s\n" % msg)
diff --git a/trezorlib/debuglink.py b/trezorlib/debuglink.py
index a9cbff3..1f20845 100644
--- a/trezorlib/debuglink.py
+++ b/trezorlib/debuglink.py
@@ -8,7 +8,7 @@ def button_press(yes_no):
     print("User pressed", '"y"' if yes_no else '"n"')
 
 def pprint(msg):
-    return "<%s> (%d bytes):\n%s" % (msg.__class__.__name__, msg.ByteSize(), msg)
+    return "<%s> (%d bytes):\n%s" % (msg.__class__.__name__, msg.ByteSize(), '#FIXME') # msg))
 
 class DebugLink(object):
     def __init__(self, transport, pin_func=pin_info, button_func=button_press):
diff --git a/trezorlib/messages_pb2.py b/trezorlib/messages_pb2.py
index 30d24b2..b7427b6 100644
--- a/trezorlib/messages_pb2.py
+++ b/trezorlib/messages_pb2.py
@@ -14,7 +14,7 @@ from google.protobuf import descriptor_pb2
 _sym_db = _symbol_database.Default()
 
 
-import types_pb2
+from . import types_pb2
 
 
 DESCRIPTOR = _descriptor.FileDescriptor(
diff --git a/trezorlib/tools.py b/trezorlib/tools.py
index e01a887..7b7805b 100644
--- a/trezorlib/tools.py
+++ b/trezorlib/tools.py
@@ -33,7 +33,7 @@ __b58base = len(__b58chars)
 def b58encode(v):
     """ encode v, which is a string of bytes, to base58."""
 
-    long_value = 0L
+    long_value = 0
     for (i, c) in enumerate(v[::-1]):
         long_value += (256 ** i) * ord(c)
 
@@ -57,7 +57,7 @@ def b58encode(v):
 
 def b58decode(v, length):
     """ decode v into a string of len bytes."""
-    long_value = 0L
+    long_value = 0
     for (i, c) in enumerate(v[::-1]):
         long_value += __b58chars.find(c) * (__b58base ** i)
 
diff --git a/trezorlib/transport.py b/trezorlib/transport.py
index 07db893..4cdbf24 100644
--- a/trezorlib/transport.py
+++ b/trezorlib/transport.py
@@ -66,7 +66,7 @@ class Transport(object):
         """
         ser = msg.SerializeToString()
         header = struct.pack(">HL", mapping.get_type(msg), len(ser))
-        self._write("##%s%s" % (header, ser), msg)
+        self._write(b"##" + header + ser, msg)
 
     def read(self):
         """
@@ -110,14 +110,14 @@ class Transport(object):
             # Align cursor to the beginning of the header ("##")
             c = read_f.read(1)
             i = 0
-            while c != '#':
+            while c != b"#":
                 i += 1
                 if i >= 64:
                     # timeout
                     raise Exception("Timed out while waiting for the magic character")
                 c = read_f.read(1)
 
-            if read_f.read(1) != "#":
+            if read_f.read(1) != b"#":
                 # Second character must be # to be valid header
                 raise Exception("Second magic character is broken")
 
diff --git a/trezorlib/transport_pipe.py b/trezorlib/transport_pipe.py
index 2f67898..9fd47b2 100644
--- a/trezorlib/transport_pipe.py
+++ b/trezorlib/transport_pipe.py
@@ -26,10 +26,10 @@ class PipeTransport(Transport):
                 raise Exception("Not connected")
 
         self.write_fd = os.open(self.filename_write, os.O_RDWR)#|os.O_NONBLOCK)
-        self.write_f = os.fdopen(self.write_fd, 'w+')
+        self.write_f = os.fdopen(self.write_fd, 'w+b', 0)
 
         self.read_fd = os.open(self.filename_read, os.O_RDWR)#|os.O_NONBLOCK)
-        self.read_f = os.fdopen(self.read_fd, 'rb')
+        self.read_f = os.fdopen(self.read_fd, 'rb', 0)
 
     def _close(self):
         self.read_f.close()
diff --git a/trezorlib/tx_api.py b/trezorlib/tx_api.py
index 2da2f4a..187a93a 100644
--- a/trezorlib/tx_api.py
+++ b/trezorlib/tx_api.py
@@ -1,10 +1,16 @@
 import binascii
-import urllib2
 import json
 from decimal import Decimal
 # from filecache import filecache, DAY
 from . import types_pb2 as proto_types
 
+try:
+    # For Python 3.0 and later
+    from urllib.request import urlopen
+except ImportError:
+    # Fall back to Python 2's urllib2
+    from urllib2 import urlopen
+
 def insight_tx(url, rawdata=False):
     if not rawdata:
         try: