ebsnvme-id: fix flake8 warnings

No functional changes

Note that there are a few lines that still fail the "line too long" check,
mostly due to comments or embedded human-readable text.  In my opinion, fixing
these errors had a negative impact on readability, so I left the lines in place
and suppressed the warnings.

Signed-off-by: Noah Meyerhans <nmeyerha@amzn.com>

Author: Noah Meyerhans

ebsnvme-id

@@ -13,7 +13,8 @@ the volume.
 """
 
 import argparse
-from ctypes import *
+from ctypes import Structure, c_uint8, c_uint16, \
+        c_uint32, c_uint64, c_char, addressof, sizeof
 from fcntl import ioctl
 import sys
 
@@ -22,6 +23,7 @@ NVME_IOCTL_ADMIN_CMD = 0xC0484E41
 AMZN_NVME_VID = 0x1D0F
 AMZN_NVME_EBS_MN = "Amazon Elastic Block Store"
 
+
 class nvme_admin_command(Structure):
     _pack_ = 1
     _fields_ = [("opcode", c_uint8),      # op code
@@ -41,11 +43,13 @@ class nvme_admin_command(Structure):
                 ("cdw15", c_uint32),
                 ("reserved1", c_uint64)]
 
+
 class nvme_identify_controller_amzn_vs(Structure):
     _pack_ = 1
     _fields_ = [("bdev", c_char * 32),  # block device name
                 ("reserved0", c_char * (1024 - 32))]
 
+
 class nvme_identify_controller_psd(Structure):
     _pack_ = 1
     _fields_ = [("mp", c_uint16),       # maximum power
@@ -58,6 +62,7 @@ class nvme_identify_controller_psd(Structure):
                 ("rwl", c_uint8),       # relative write latency
                 ("reserved1", c_char * 16)]
 
+
 class nvme_identify_controller(Structure):
     _pack_ = 1
     _fields_ = [("vid", c_uint16),          # PCI Vendor ID
@@ -77,7 +82,7 @@ class nvme_identify_controller(Structure):
                 ("lpa", c_uint8),           # Log Page Attributes
                 ("elpe", c_uint8),          # Error Log Page Entries
                 ("npss", c_uint8),          # Number of Power States Support
-                ("avscc", c_uint8),         # Admin Vendor Specific Command Configuration
+                ("avscc", c_uint8),         # Admin Vendor Specific Command Configuration # noqa
                 ("reserved1", c_uint8 * (512 - 265)),
                 ("sqes", c_uint8),          # Submission Queue Entry Size
                 ("cqes", c_uint8),          # Completion Queue Entry Size
@@ -89,22 +94,23 @@ class nvme_identify_controller(Structure):
                 ("vwc", c_uint8),           # Volatile Write Cache
                 ("awun", c_uint16),         # Atomic Write Unit Normal
                 ("awupf", c_uint16),        # Atomic Write Unit Power Fail
-                ("nvscc", c_uint8),         # NVM Vendor Specific Command Configuration
+                ("nvscc", c_uint8),         # NVM Vendor Specific Command Configuration # noqa
                 ("reserved3", c_uint8 * (704 - 531)),
                 ("reserved4", c_uint8 * (2048 - 704)),
-                ("psd", nvme_identify_controller_psd * 32),     # Power State Descriptor
+                ("psd", nvme_identify_controller_psd * 32),  # Power State Descriptor # noqa
                 ("vs", nvme_identify_controller_amzn_vs)]  # Vendor Specific
 
+
 class ebs_nvme_device:
     def __init__(self, device):
         self.device = device
         self.ctrl_identify()
 
     def _nvme_ioctl(self, id_response, id_len):
-        admin_cmd = nvme_admin_command(opcode = NVME_ADMIN_IDENTIFY,
-                                       addr = id_response,
-                                       alen = id_len,
-                                       cdw10 = 1)
+        admin_cmd = nvme_admin_command(opcode=NVME_ADMIN_IDENTIFY,
+                                       addr=id_response,
+                                       alen=id_len,
+                                       cdw10=1)
 
         with open(self.device, "r+") as nvme:
             ioctl(nvme, NVME_IOCTL_ADMIN_CMD, admin_cmd)
@@ -113,8 +119,9 @@ class ebs_nvme_device:
         self.id_ctrl = nvme_identify_controller()
         self._nvme_ioctl(addressof(self.id_ctrl), sizeof(self.id_ctrl))
 
-        if self.id_ctrl.vid != AMZN_NVME_VID or self.id_ctrl.mn.decode().strip() != AMZN_NVME_EBS_MN:
-            raise TypeError("[ERROR] Not an EBS device: '{0}'".format(self.device))
+        if self.id_ctrl.vid != AMZN_NVME_VID \
+                or self.id_ctrl.mn.decode().strip() != AMZN_NVME_EBS_MN:
+            raise TypeError("[ERROR] Not an EBS device: '{0}'".format(self.device)) # noqa
 
     def get_volume_id(self):
         vol = self.id_ctrl.sn.decode()
@@ -132,17 +139,19 @@ class ebs_nvme_device:
 
         return dev
 
+
 if __name__ == "__main__":
-    parser = argparse.ArgumentParser(description="Reads EBS information from NVMe devices.")
+    parser = \
+        argparse.ArgumentParser(description="Reads EBS information from NVMe devices.") # noqa
     parser.add_argument("device", nargs=1, help="Device to query")
 
     display = parser.add_argument_group("Display Options")
     display.add_argument("-v", "--volume", action="store_true",
-            help="Return volume-id")
+                         help="Return volume-id")
     display.add_argument("-b", "--block-dev", action="store_true",
-            help="Return block device mapping")
+                         help="Return block device mapping")
     display.add_argument("-u", "--udev", action="store_true",
-            help="Output data in format suitable for udev rules")
+                         help="Output data in format suitable for udev rules")
 
     if len(sys.argv) < 2:
         parser.print_help()