diff --git a/contrib/pyzfs/libzfs_core/_constants.py b/contrib/pyzfs/libzfs_core/_constants.py
index 7ee2ef87df3e..2db2bba8a824 100644
--- a/contrib/pyzfs/libzfs_core/_constants.py
+++ b/contrib/pyzfs/libzfs_core/_constants.py
@@ -1,117 +1,117 @@
 #
 # Copyright 2015 ClusterHQ
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #    http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
 
 """
 Important `libzfs_core` constants.
 """
 
 from __future__ import absolute_import, division, print_function
 import errno
 import sys
 
 
 # Compat for platform-specific errnos
 if sys.platform.startswith('freebsd'):
     ECHRNG = errno.ENXIO
     ECKSUM = 97  # EINTEGRITY
     ETIME = errno.ETIMEDOUT
 else:
     ECHRNG = errno.ECHRNG
     ECKSUM = errno.EBADE
     ETIME = errno.ETIME
 
 
 # https://stackoverflow.com/a/1695250
 def enum_with_offset(offset, sequential, named):
     enums = dict(((b, a + offset) for a, b in enumerate(sequential)), **named)
     return type('Enum', (), enums)
 
 
 def enum(*sequential, **named):
     return enum_with_offset(0, sequential, named)
 
 
 #: Maximum length of any ZFS name.
 MAXNAMELEN = 255
 #: Default channel program limits
 ZCP_DEFAULT_INSTRLIMIT = 10 * 1000 * 1000
 ZCP_DEFAULT_MEMLIMIT = 10 * 1024 * 1024
 #: Encryption wrapping key length
 WRAPPING_KEY_LEN = 32
 #: Encryption key location enum
 zfs_key_location = enum(
     'ZFS_KEYLOCATION_NONE',
     'ZFS_KEYLOCATION_PROMPT',
     'ZFS_KEYLOCATION_URI'
 )
 #: Encryption key format enum
 zfs_keyformat = enum(
     'ZFS_KEYFORMAT_NONE',
     'ZFS_KEYFORMAT_RAW',
     'ZFS_KEYFORMAT_HEX',
     'ZFS_KEYFORMAT_PASSPHRASE'
 )
 # Encryption algorithms enum
 zio_encrypt = enum(
     'ZIO_CRYPT_INHERIT',
     'ZIO_CRYPT_ON',
     'ZIO_CRYPT_OFF',
     'ZIO_CRYPT_AES_128_CCM',
     'ZIO_CRYPT_AES_192_CCM',
     'ZIO_CRYPT_AES_256_CCM',
     'ZIO_CRYPT_AES_128_GCM',
     'ZIO_CRYPT_AES_192_GCM',
     'ZIO_CRYPT_AES_256_GCM'
 )
 # ZFS-specific error codes
 zfs_errno = enum_with_offset(1024, [
         'ZFS_ERR_CHECKPOINT_EXISTS',
         'ZFS_ERR_DISCARDING_CHECKPOINT',
         'ZFS_ERR_NO_CHECKPOINT',
         'ZFS_ERR_DEVRM_IN_PROGRESS',
         'ZFS_ERR_VDEV_TOO_BIG',
         'ZFS_ERR_IOC_CMD_UNAVAIL',
         'ZFS_ERR_IOC_ARG_UNAVAIL',
         'ZFS_ERR_IOC_ARG_REQUIRED',
         'ZFS_ERR_IOC_ARG_BADTYPE',
         'ZFS_ERR_WRONG_PARENT',
         'ZFS_ERR_FROM_IVSET_GUID_MISSING',
         'ZFS_ERR_FROM_IVSET_GUID_MISMATCH',
         'ZFS_ERR_SPILL_BLOCK_FLAG_MISSING',
         'ZFS_ERR_UNKNOWN_SEND_STREAM_FEATURE',
         'ZFS_ERR_EXPORT_IN_PROGRESS',
         'ZFS_ERR_BOOKMARK_SOURCE_NOT_ANCESTOR',
         'ZFS_ERR_STREAM_TRUNCATED',
         'ZFS_ERR_STREAM_LARGE_BLOCK_MISMATCH',
         'ZFS_ERR_RESILVER_IN_PROGRESS',
         'ZFS_ERR_REBUILD_IN_PROGRESS',
         'ZFS_ERR_BADPROP',
         'ZFS_ERR_VDEV_NOTSUP',
         'ZFS_ERR_NOT_USER_NAMESPACE',
     ],
     {}
 )
 # compat before we used the enum helper for these values
 ZFS_ERR_CHECKPOINT_EXISTS = zfs_errno.ZFS_ERR_CHECKPOINT_EXISTS
-assert(ZFS_ERR_CHECKPOINT_EXISTS == 1024)
+assert (ZFS_ERR_CHECKPOINT_EXISTS == 1024)
 ZFS_ERR_DISCARDING_CHECKPOINT = zfs_errno.ZFS_ERR_DISCARDING_CHECKPOINT
 ZFS_ERR_NO_CHECKPOINT = zfs_errno.ZFS_ERR_NO_CHECKPOINT
 ZFS_ERR_DEVRM_IN_PROGRESS = zfs_errno.ZFS_ERR_DEVRM_IN_PROGRESS
 ZFS_ERR_VDEV_TOO_BIG = zfs_errno.ZFS_ERR_VDEV_TOO_BIG
 ZFS_ERR_WRONG_PARENT = zfs_errno.ZFS_ERR_WRONG_PARENT
 ZFS_ERR_VDEV_NOTSUP = zfs_errno.ZFS_ERR_VDEV_NOTSUP
 
 # vim: softtabstop=4 tabstop=4 expandtab shiftwidth=4