diff --git a/labrad/decorators.py b/labrad/decorators.py
index aba22d0..e6659b5 100644
--- a/labrad/decorators.py
+++ b/labrad/decorators.py
@@ -102,7 +102,7 @@ def __init__(self, func, lr_ID, lr_name, returns, unflatten, **params):
         #    unpack tuples, so this case is not allowed:  The first argument
         #    cannot be a tuple or '?' tag if the second argument is optional.
         
-        argspec = inspect.getargspec(self.func)
+        argspec = inspect.getfullargspec(self.func)
         args = argspec.args[2:] # Skip 'self' and context data arguments.
 
         if inspect.isgeneratorfunction(func):
@@ -224,8 +224,8 @@ def messageHandler(lr_ID, lr_name=None, returns=[], lr_num_params=2, **params):
     strings of allowed types.
     """
     def decorated(f):
-        args, varargs, varkw, defaults = inspect.getargspec(f)
-        args = args[lr_num_params:]
+        argspec = inspect.getfullargspec(f)
+        args, defaults = argspec.args[lr_num_params:], argspec.defaults
 
         # handle generators as defer.inlineCallbacks
         if inspect.isgeneratorfunction(f):
diff --git a/labrad/node/server_config.py b/labrad/node/server_config.py
index f83733a..95d2ebf 100644
--- a/labrad/node/server_config.py
+++ b/labrad/node/server_config.py
@@ -30,7 +30,7 @@ def from_string(conf, filename=None, path=None, platform=sys.platform):
     if isinstance(conf, bytes):
         conf = conf.decode('utf-8')
     scp = ConfigParser()
-    scp.readfp(io.StringIO(conf))
+    scp.read_file(io.StringIO(conf))
 
     # general information
     name = scp.get('info', 'name', raw=True)
diff --git a/labrad/test/extraction_test.py b/labrad/test/extraction_test.py
index 97fb808..1354f78 100644
--- a/labrad/test/extraction_test.py
+++ b/labrad/test/extraction_test.py
@@ -17,8 +17,8 @@ def timeIt(f, *a, **kw):
     return result
 
 def extractAverage(packets):
-    data = ''.join(packets)
-    Is, Qs = np.fromstring(data, dtype='<i2').reshape(-1, 2).astype(int).T
+    data = b''.join(packets)
+    Is, Qs = np.frombuffer(data, dtype='<i2').reshape(-1, 2).astype(int).T
     return (Is, Qs)
 
 def extract(packets):
@@ -29,7 +29,7 @@ def extract(packets):
 mac = '01:23:45:67:89:ab'
 eth = 1
 
-packets = [(mac, mac, eth, '\x00'*44) for _ in range(9000)]
+packets = [(mac, mac, eth, b'\x00' * 44) for _ in range(9000)]
 data, t, endianness = types.flatten(packets)
 
 timeIt(extract, packets)
diff --git a/labrad/types/types.py b/labrad/types/types.py
index b2984fd..a41385f 100644
--- a/labrad/types/types.py
+++ b/labrad/types/types.py
@@ -163,7 +163,7 @@ def parseSingleType(s):
     s.strip(WHITESPACE)
     return t
 
-COMMENTS = re.compile('\{[^\{\}]*\}')
+COMMENTS = re.compile(r'\{[^\{\}]*\}')
 
 def stripComments(s):
     """Remove comments from a type tag.
@@ -1222,9 +1222,9 @@ def unflattenNDlist(s, dims):
     def _unflatten_as_array(self, s, endianness, elem, dims, size):
         """Unflatten to numpy array."""
         def make(t, width):
-            a = np.fromstring(s.get(size*width), dtype=np.dtype(t))
+            a = np.frombuffer(s.get(size*width), dtype=np.dtype(t))
             if endianness != SYSTEM_BYTE_ORDER:
-                a.byteswap(True) # inplace
+                a = a.byteswap(inplace=False)
             return a
 
         if elem == TBool(): a = make('bool', 1)