debian/bin, debian/lib/python: Fix most errors reported by pycodestyle

Fix coding style violations reported by pycodestyle.  This is
mostly a matter of reformatting code, particularly to eliminate
over-long lines.  I also rename one variable ("l" is considered
visually ambiguous) and change a bare "except" to explicitly
catch all exceptions.

There are three types of error or warning remaining:

- debian/bin/...: E402 module level import not at top of file
  Scripts in debian/bin need to modify the import path before
  importing from debian/lib/python.
- E127 continuation line over-indented for visual indent
  This seems to be a false positive.  pycodestyle doesn't seem to be
  happy with any level of indent (including 0) on a continuation line
  in a "with" statement.
- debian/lib/python/debian_linux/debian.py:15:2: W291 trailing whitespace
  This is a false positive.  The trailing spaces are in a long
  string and are intentional.

1 files changed, 6 insertions, 2 deletions

diff --git a/debian/lib/python/debian_linux/utils.py b/debian/lib/python/debian_linux/utils.py
index 5d6a7d473066..34c15536df05 100644
--- a/debian/lib/python/debian_linux/utils.py
+++ b/debian/lib/python/debian_linux/utils.py
@@ -44,10 +44,12 @@ def read_control(f):
     from .debian import Package
     return _read_rfc822(f, Package)
 
+
 def read_tests_control(f):
     from .debian import TestsControl
     return _read_rfc822(f, TestsControl)
 
+
 def _read_rfc822(f, cls):
     entries = []
     eof = False
@@ -69,14 +71,16 @@ def _read_rfc822(f, cls):
                 break
             if line[0] in ' \t':
                 if not last:
-                    raise ValueError('Continuation line seen before first header')
+                    raise ValueError(
+                        'Continuation line seen before first header')
                 lines.append(line.lstrip())
                 continue
             if last:
                 e[last] = '\n'.join(lines)
             i = line.find(':')
             if i < 0:
-                raise ValueError(u"Not a header, not a continuation: ``%s''" % line)
+                raise ValueError(u"Not a header, not a continuation: ``%s''" %
+                                 line)
             last = line[:i]
             lines = [line[i + 1:].lstrip()]
         if last: