diff --git a/src/allmydata/client.py b/src/allmydata/client.py
index ad5e61c14..50ceb448f 100644
--- a/src/allmydata/client.py
+++ b/src/allmydata/client.py
@@ -31,13 +31,11 @@ from allmydata.util.abbreviate import parse_abbreviated_size
 from allmydata.util.time_format import parse_duration, parse_date
 from allmydata.util.i2p_provider import create as create_i2p_provider
 from allmydata.util.tor_provider import create as create_tor_provider
-from allmydata.util.base32 import a2b, b2a
 from allmydata.stats import StatsProvider
 from allmydata.history import History
 from allmydata.interfaces import IStatsProducer, SDMF_VERSION, MDMF_VERSION, DEFAULT_MAX_SEGMENT_SIZE
 from allmydata.nodemaker import NodeMaker
 from allmydata.blacklist import Blacklist
-from allmydata import node
 
 
 KiB=1024
diff --git a/src/allmydata/scripts/admin.py b/src/allmydata/scripts/admin.py
index 0a641728c..ef1059a31 100644
--- a/src/allmydata/scripts/admin.py
+++ b/src/allmydata/scripts/admin.py
@@ -72,7 +72,7 @@ class AddGridManagerCertOptions(BaseOptions):
                 "Must provide --filename option"
             )
         if self['filename'] == '-':
-            print >>self.parent.parent.stderr, "reading certificate from stdin"
+            print("reading certificate from stdin", file=self.parent.parent.stderr)
             data = sys.stdin.read()
             if len(data) == 0:
                 raise usage.UsageError(
@@ -82,7 +82,7 @@ class AddGridManagerCertOptions(BaseOptions):
             try:
                 self.certificate_data = parse_grid_manager_data(data)
             except ValueError as e:
-                print >>self.parent.parent.stderr, "Error parsing certificate: {}".format(e)
+                print("Error parsing certificate: {}".format(e), file=self.parent.parent.stderr)
                 self.certificate_data = None
         else:
             with open(self['filename'], 'r') as f:
@@ -118,10 +118,10 @@ def add_grid_manager_cert(options):
     cert_fname = "{}.cert".format(options['name'])
     cert_path = config.get_config_path(cert_fname)
     cert_bytes = json.dumps(options.certificate_data, indent=4) + '\n'
-    cert_name = options['name']
+    # cert_name = options['name']
 
     if exists(cert_path):
-        print >>options.parent.parent.stderr, "Already have file '{}'".format(cert_path)
+        print("Already have file '{}'".format(cert_path), file=options.parent.parent.stderr)
         return 1
 
     cfg = config.config  # why aren't methods we call on cfg in _Config itself?
@@ -141,7 +141,7 @@ def add_grid_manager_cert(options):
         cfg.write(f)
     # print("wrote {}".format(config_fname))
 
-    print >>options.parent.parent.stderr, "There are now {} certificates".format(len(gm_certs))
+    print("There are now {} certificates".format(len(gm_certs)), file=options.parent.parent.stderr)
 
     return 0
 
diff --git a/src/allmydata/scripts/tahoe_grid_manager.py b/src/allmydata/scripts/tahoe_grid_manager.py
index f7193cbf2..b33552861 100644
--- a/src/allmydata/scripts/tahoe_grid_manager.py
+++ b/src/allmydata/scripts/tahoe_grid_manager.py
@@ -1,5 +1,5 @@
+from __future__ import print_function
 
-import os
 import sys
 import json
 import time
diff --git a/src/allmydata/storage_client.py b/src/allmydata/storage_client.py
index 53b0d5c53..5f65c6cec 100644
--- a/src/allmydata/storage_client.py
+++ b/src/allmydata/storage_client.py
@@ -43,7 +43,6 @@ from pycryptopp.publickey import ed25519  # perhaps NaCl instead? other code use
 
 from allmydata.interfaces import IStorageBroker, IDisplayableServer, IServer
 from allmydata.util import log, base32, connection_status
-from allmydata.util import keyutil
 from allmydata.util.assertutil import precondition
 from allmydata.util.observer import ObserverList
 from allmydata.util.rrefutil import add_version_to_remote_reference
@@ -304,7 +303,7 @@ def parse_grid_manager_data(gm_data):
                     k,
                 )
             )
-    for k in allowed_keys:
+    for k in required_keys:
         if k not in js:
             raise ValueError(
                 "Grid Manager certificate JSON must contain '{}'".format(