diff --git a/letsencrypt/client/client.py b/letsencrypt/client/client.py
index 5b6797005..aca683265 100644
--- a/letsencrypt/client/client.py
+++ b/letsencrypt/client/client.py
@@ -272,7 +272,7 @@ def validate_key_csr(privkey, csr=None):
     if csr:
         if csr.form == "der":
             csr_obj = M2Crypto.X509.load_request_der_string(csr.data)
-            csr = Client.CSR(csr.file, csr_obj.as_pem(), "der")
+            csr = le_util.CSR(csr.file, csr_obj.as_pem(), "der")
 
         # If CSR is provided, it must be readable and valid.
         if csr.data and not crypto_util.valid_csr(csr.data):
diff --git a/letsencrypt/client/display/display_util.py b/letsencrypt/client/display/display_util.py
index 306729e40..d0df0fa12 100644
--- a/letsencrypt/client/display/display_util.py
+++ b/letsencrypt/client/display/display_util.py
@@ -5,7 +5,6 @@ import textwrap
 import dialog
 import zope.interface
 
-from letsencrypt.client import errors
 from letsencrypt.client import interfaces
 
 
@@ -35,6 +34,7 @@ class NcursesDisplay(object):
         self.height = height
 
     def notification(self, message, height=10, pause=False):
+        # pylint: disable=unused-argument
         """Display a notification to the user and wait for user acceptance.
 
         :param str message: Message to display
@@ -150,6 +150,7 @@ class FileDisplay(object):
         self.outfile = outfile
 
     def notification(self, message, height=10, pause=True):
+        # pylint: disable=unused-argument
         """Displays a notification and waits for user acceptance.
 
         :param str message: Message to display
@@ -166,8 +167,9 @@ class FileDisplay(object):
         if pause:
             raw_input("Press Enter to Continue")
 
-    def menu(
-        self, message, choices, ok_label="", cancel_label="", help_label=""):
+    def menu(self, message, choices,
+             ok_label="", cancel_label="", help_label=""):
+        # pylint: disable=unused-argument
         """Display a menu.
 
         :param str message: title of menu
@@ -264,6 +266,7 @@ class FileDisplay(object):
                 return code, []
 
     def _scrub_checklist_input(self, indices, tags):
+        # pylint: disable=no-self-use
         """Validate input and transform indices to appropriate tags.
 
         :param list indices: input
@@ -335,7 +338,7 @@ class FileDisplay(object):
 
         return os.linesep.join(fixed_l)
 
-    def _get_valid_int_ans(self, max):
+    def _get_valid_int_ans(self, max_):
         """Get a numerical selection.
 
         :param int max: The maximum entry (len of choices), must be positive
@@ -347,10 +350,10 @@ class FileDisplay(object):
 
         """
         selection = -1
-        if max > 1:
+        if max_ > 1:
             input_msg = ("Select the appropriate number "
-                         "[1-{max}] then [enter] (press 'c' to "
-                         "cancel): ".format(max=max))
+                         "[1-{max_}] then [enter] (press 'c' to "
+                         "cancel): ".format(max_=max_))
         else:
             input_msg = ("Press 1 [enter] to confirm the selection "
                          "(press 'c' to cancel): ")
@@ -360,7 +363,7 @@ class FileDisplay(object):
                 return CANCEL, -1
             try:
                 selection = int(ans)
-                if selection < 1 or selection > max:
+                if selection < 1 or selection > max_:
                     selection = -1
                     raise ValueError
 
@@ -371,16 +374,16 @@ class FileDisplay(object):
         return OK, selection
 
 
-def separate_list_input(input):
+def separate_list_input(input_):
     """Separate a comma or space separated list.
 
-    :param str input: input from the user
+    :param str input_: input from the user
 
     :returns: strings
     :rtype: list
 
     """
-    no_commas = input.replace(",", " ")
+    no_commas = input_.replace(",", " ")
     return [string for string in no_commas.split()]
 
 def _parens_around_char(label):
diff --git a/letsencrypt/client/display/enhancements.py b/letsencrypt/client/display/enhancements.py
index 738be6429..ed73f24db 100644
--- a/letsencrypt/client/display/enhancements.py
+++ b/letsencrypt/client/display/enhancements.py
@@ -22,7 +22,7 @@ def ask(enhancement):
 
     """
     try:
-        return _dispatch[enhancement]()
+        return dispatch[enhancement]()
     except KeyError:
         logging.error("Unsupported enhancement given to ask()")
         raise errors.LetsEncryptClientError("Unsupported Enhancement")
@@ -40,19 +40,19 @@ def redirect_by_default():
         ("Secure", "Make all requests redirect to secure HTTPS access"),
     ]
 
-    result = _util(interfaces.IDisplay).menu(
+    code, selection = util(interfaces.IDisplay).menu(
         "Please choose whether HTTPS access is required or optional.",
         choices)
 
-    if result[0] != display_util.OK:
+    if code != display_util.OK:
         return False
 
-    return result[1] == 1
+    return selection == 1
 
 
-_util = zope.component.getUtility
+util = zope.component.getUtility  # pylint: disable=invalid-name
 
 
-_dispatch = {
+dispatch = {  # pylint: disable=invalid-name
     "redirect": redirect_by_default
-}
\ No newline at end of file
+}
diff --git a/letsencrypt/client/display/ops.py b/letsencrypt/client/display/ops.py
index 36a1498e2..22048df7b 100644
--- a/letsencrypt/client/display/ops.py
+++ b/letsencrypt/client/display/ops.py
@@ -1,4 +1,4 @@
-import logging
+"""Contains UI methods for LE user operations."""
 import os
 import sys
 
@@ -8,7 +8,7 @@ from letsencrypt.client import interfaces
 from letsencrypt.client.display import display_util
 
 # Define a helper function to avoid verbose code
-util = zope.component.getUtility
+util = zope.component.getUtility  # pylint: disable=invalid-name
 
 
 def choose_authenticator(auths):
@@ -82,11 +82,11 @@ def _filter_names(names):
 def _choose_names_manually():
     """Manualy input names for those without an installer."""
 
-    code, input = util(interfaces.IDisplay).input(
+    code, input_ = util(interfaces.IDisplay).input(
         "Please enter in your domain name(s) (comma and/or space separated) ")
 
     if code == display_util.OK:
-        return display_util.separate_list_input(input)
+        return display_util.separate_list_input(input_)
 
     sys.exit(0)
 
diff --git a/letsencrypt/client/display/revocation.py b/letsencrypt/client/display/revocation.py
index 2f162626d..04394a11e 100644
--- a/letsencrypt/client/display/revocation.py
+++ b/letsencrypt/client/display/revocation.py
@@ -1,3 +1,4 @@
+"""Revocation UI class."""
 import os
 
 import zope.component
@@ -5,7 +6,7 @@ import zope.component
 from letsencrypt.client import interfaces
 from letsencrypt.client.display import display_util
 
-util = zope.component.getUtility
+util = zope.component.getUtility  # pylint: disable=invalid-name
 
 
 def choose_certs(certs):
@@ -45,12 +46,13 @@ def display_certs(certs):
 
     """
     list_choices = [
-        ("%s | %s | %s" %
-        (str(cert.get_cn().ljust(display_util.WIDTH - 39)),
-        cert.get_not_before().strftime("%m-%d-%y"),
-        "Installed" if cert.installed and cert.installed != ["Unknown"]
-        else "")
-        for cert in enumerate(certs))
+        ("%s | %s | %s" % (
+            str(cert.get_cn().ljust(display_util.WIDTH - 39)),
+            cert.get_not_before().strftime("%m-%d-%y"),
+            "Installed" if cert.installed and cert.installed != ["Unknown"]
+            else "")
+         for cert in enumerate(certs)
+        )
     ]
 
     code, tag = util(interfaces.IDisplay).menu(
diff --git a/letsencrypt/client/errors.py b/letsencrypt/client/errors.py
index 086af84d4..c1d6c785f 100644
--- a/letsencrypt/client/errors.py
+++ b/letsencrypt/client/errors.py
@@ -41,4 +41,4 @@ class LetsEncryptMisconfigurationError(LetsEncryptConfiguratorError):
 
 
 class LetsEncryptRevokerError(LetsEncryptClientError):
-    """Let's Encrypt Revoker error."""
\ No newline at end of file
+    """Let's Encrypt Revoker error."""
diff --git a/letsencrypt/client/revoker.py b/letsencrypt/client/revoker.py
index d2c4a3b93..48d4deaff 100644
--- a/letsencrypt/client/revoker.py
+++ b/letsencrypt/client/revoker.py
@@ -95,7 +95,7 @@ class Revoker(object):
 
         self._remove_mark()
 
-    def _mark_for_revocation(self, cert):
+    def _mark_for_revocation(self, cert):  # pylint: disable=no-self-use
         """Marks a cert for revocation."""
         if os.path.isfile(Revoker.marked_path):
             raise errors.LetsEncryptRevokerError(
@@ -104,7 +104,7 @@ class Revoker(object):
             csvwriter = csv.writer(marked_file)
             csvwriter.writerow([cert.backup_path, cert.backup_key_path])
 
-    def _remove_mark(self):
+    def _remove_mark(self):  # pylint: disable=no-self-use
         """Remove the marked file."""
         os.remove(Revoker.marked_path)
 
@@ -128,6 +128,7 @@ class Revoker(object):
                 "certificates for this server.")
 
     def _populate_saved_certs(self, csha1_vhlist):
+        # pylint: disable=no-self-use
         """Populate a list of all the saved certs."""
         certs = []
         with open(Revoker.list_path, "rb") as csvfile:
@@ -188,7 +189,7 @@ class Revoker(object):
         os.remove(cert.backup_path)
         os.remove(cert.backup_key_path)
 
-    def _remove_cert_from_list(self, cert):
+    def _remove_cert_from_list(self, cert):  # pylint: disable=no-self-use
         """Remove a certificate from the LIST file."""
         list_path2 = os.path.join(CONFIG.CERT_KEY_BACKUP, "LIST.tmp")
 
@@ -346,34 +347,44 @@ class Cert(object):
         self.backup_key_path = backup_key
 
     def get_installed_msg(self):
+        """Access installed message."""
         return ", ".join(self.installed)
 
     def get_subject(self):
+        """Get subject."""
         return self.cert.get_subject().as_text()
 
     def get_cn(self):
+        """Get common name."""
         return self.cert.get_subject().CN
 
     def get_issuer(self):
+        """Get issuer."""
         return self.cert.get_issuer().as_text()
 
     def get_fingerprint(self):
+        """Get sha1 fingerprint."""
         return self.cert.get_fingerprint(md="sha1")
 
     def get_not_before(self):
+        """Get not_valid_before field."""
         return self.cert.get_not_before().get_datetime()
 
     def get_not_after(self):
+        """Get not_valid_after field."""
         return self.cert.get_not_after().get_datetime()
 
     def get_serial(self):
+        """Get serial number."""
         self.cert.get_serial_number()
 
     def get_pub_key(self):
+        """Get public key size."""
         # .. todo:: M2Crypto doesn't support ECC, this will have to be updated
         return "RSA " + str(self.cert.get_pubkey().size() * 8)
 
     def get_san(self):
+        """Get subject alternative name if available."""
         try:
             return self.cert.get_ext("subjectAltName").get_value()
         except LookupError:
diff --git a/letsencrypt/client/tests/apache/configurator_test.py b/letsencrypt/client/tests/apache/configurator_test.py
index e662e5eab..c1ad7278d 100644
--- a/letsencrypt/client/tests/apache/configurator_test.py
+++ b/letsencrypt/client/tests/apache/configurator_test.py
@@ -166,6 +166,7 @@ class TwoVhost80Test(util.ApacheTest):
 
 
 class GetVersionTest(unittest.TestCase):
+    # pylint: disable=too-few-public-methods
     @classmethod
     def _call(cls):
         from letsencrypt.client.apache.configurator import get_version
diff --git a/letsencrypt/client/tests/display/display_util_test.py b/letsencrypt/client/tests/display/display_util_test.py
index 42c551bad..3c81a463f 100644
--- a/letsencrypt/client/tests/display/display_util_test.py
+++ b/letsencrypt/client/tests/display/display_util_test.py
@@ -1,4 +1,4 @@
-import contextlib
+"""Test the display utility."""
 import os
 import unittest
 
@@ -8,6 +8,8 @@ from letsencrypt.client.display import display_util
 
 
 class DisplayT(unittest.TestCase):
+    """Base class for both utility classes."""
+    # pylint: disable=too-few-public-methods
     def setUp(self):
         self.choices = [("First", "Description1"), ("Second", "Description2")]
         self.tags = ["tag1", "tag2", "tag3"]
@@ -205,6 +207,7 @@ class FileOutputDisplayTest(DisplayT):
         self.assertEqual(ret, (display_util.CANCEL, []))
 
     def test_scrub_checklist_input_valid(self):
+        # pylint: disable=protected-access
         indices = [
             ["1"],
             ["1", "2", "1"],
@@ -221,6 +224,7 @@ class FileOutputDisplayTest(DisplayT):
             self.assertEqual(set_tags, exp[i])
 
     def test_scrub_checklist_input_invalid(self):
+        # pylint: disable=protected-access
         indices = [
             ["0"],
             ["4"],
@@ -233,11 +237,13 @@ class FileOutputDisplayTest(DisplayT):
                 self.displayer._scrub_checklist_input(list_, self.tags), [])
 
     def test_print_menu(self):
+        # pylint: disable=protected-access
         # This is purely cosmetic... just make sure there aren't any exceptions
         self.displayer._print_menu("msg", self.choices)
         self.displayer._print_menu("msg", self.tags)
 
     def test_wrap_lines(self):
+        # pylint: disable=protected-access
         msg = ("This is just a weak test\n"
                "This function is only meant to be for easy viewing\n"
                "Test a really really really really really really really really "
@@ -247,6 +253,7 @@ class FileOutputDisplayTest(DisplayT):
         self.assertEqual(text.count(os.linesep), 3)
 
     def test_get_valid_int_ans_valid(self):
+        # pylint: disable=protected-access
         with mock.patch("__builtin__.raw_input", return_value="1"):
             self.assertEqual(
                 self.displayer._get_valid_int_ans(1), (display_util.OK, 1))
@@ -257,6 +264,7 @@ class FileOutputDisplayTest(DisplayT):
                 (display_util.OK, int(ans)))
 
     def test_get_valid_int_ans_invalid(self):
+        # pylint: disable=protected-access
         answers = [
             ["0", "c"],
             ["4", "one", "C"],
@@ -279,9 +287,9 @@ class SeparateListInputTest(unittest.TestCase):
         self.exp = ["a", "b", "c", "test"]
 
     @classmethod
-    def _call(cls, input):
+    def _call(cls, input_):
         from letsencrypt.client.display.display_util import separate_list_input
-        return separate_list_input(input)
+        return separate_list_input(input_)
 
     def test_commas(self):
         actual = self._call("a,b,c,test")
@@ -305,7 +313,7 @@ class SeparateListInputTest(unittest.TestCase):
 
 class PlaceParensTest(unittest.TestCase):
     @classmethod
-    def _call(cls, label):
+    def _call(cls, label):  # pylint: disable=protected-access
         from letsencrypt.client.display.display_util import _parens_around_char
         return _parens_around_char(label)
 
@@ -319,4 +327,4 @@ class PlaceParensTest(unittest.TestCase):
 
 
 if __name__ == "__main__":
-    unittest.main()
\ No newline at end of file
+    unittest.main()
diff --git a/letsencrypt/client/tests/display/ops_test.py b/letsencrypt/client/tests/display/ops_test.py
index bb105ce65..10d8d9642 100644
--- a/letsencrypt/client/tests/display/ops_test.py
+++ b/letsencrypt/client/tests/display/ops_test.py
@@ -1,3 +1,4 @@
+"""Test display.ops."""
 import sys
 import unittest
 
@@ -129,13 +130,15 @@ class ChooseNamesTest(unittest.TestCase):
     @mock.patch("letsencrypt.client.display.ops.util")
     def test_filter_names_cancel(self, mock_util):
         self.mock_install.get_all_names.return_value = set(["example.com"])
-        mock_util().checklist.return_value = (display_util.CANCEL, ["example.com"])
+        mock_util().checklist.return_value = (
+            display_util.CANCEL, ["example.com"])
 
         self.assertRaises(SystemExit, self._call, self.mock_install)
 
 
 class SuccessInstallationTest(unittest.TestCase):
-
+    # pylint: disable=too-few-public-methods
+    """Test the success installation message."""
     @classmethod
     def _call(cls, names):
         from letsencrypt.client.display.ops import success_installation
@@ -156,4 +159,4 @@ class SuccessInstallationTest(unittest.TestCase):
 
 
 if __name__ == "__main__":
-    unittest.main()
\ No newline at end of file
+    unittest.main()
diff --git a/letsencrypt/scripts/main.py b/letsencrypt/scripts/main.py
index 7096c17e1..24892f6a8 100755
--- a/letsencrypt/scripts/main.py
+++ b/letsencrypt/scripts/main.py
@@ -105,7 +105,7 @@ def main():  # pylint: disable=too-many-statements,too-many-branches
     except errors.LetsEncryptMisconfigurationError as err:
         logging.fatal("Please fix your configuration before proceeding.%s"
                       "The Authenticator exited with the following message: "
-                      "%s", (os.linesep, err))
+                      "%s", os.linesep, err)
         sys.exit(1)
 
     # Use the same object if possible
@@ -114,7 +114,7 @@ def main():  # pylint: disable=too-many-statements,too-many-branches
     else:
         installer = client.determine_installer()
 
-    domains = ops.choose_names(installer) if args.domains is None else args.domains
+    doms = ops.choose_names(installer) if args.domains is None else args.domains
 
     # Prepare for init of Client
     if args.privkey is None:
@@ -133,11 +133,11 @@ def main():  # pylint: disable=too-many-statements,too-many-branches
     # but this code should be safe on all environments.
     cert_file = None
     if auth is not None:
-        cert_file, chain_file = acme.obtain_certificate(domains)
+        cert_file, chain_file = acme.obtain_certificate(doms)
     if installer is not None and cert_file is not None:
-        acme.deploy_certificate(domains, privkey, cert_file, chain_file)
+        acme.deploy_certificate(doms, privkey, cert_file, chain_file)
     if installer is not None:
-        acme.enhance_config(domains, args.redirect)
+        acme.enhance_config(doms, args.redirect)
 
 
 def display_eula():