Remove dead code

We not not appear to have ever emitted this header (or rather, set
prefix to True).

Change-Id: I6e289c91b8efad227778c1a5c4b519458c1aa600
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

openstack_requirements/cmds/edit_constraint.py

@@ -68,7 +68,7 @@ def main(argv=None, stdout=None):
     content = open(args[0], 'rt').read()
     reqs = requirement.parse(content, permit_urls=True)
     out_reqs = edit(reqs, args[1], args[2])
-    out = requirement.to_content(out_reqs, prefix=False)
+    out = requirement.to_content(out_reqs)
     with open(args[0] + '.tmp', 'wt') as f:
         f.write(out)
     if os.path.exists(args[0]):

openstack_requirements/requirement.py

@@ -21,17 +21,6 @@ import pkg_resources
 import re
 
 
-# A header for the requirements file(s).
-# TODO(lifeless): Remove this once constraints are in use.
-_REQS_HEADER = [
-    '# The order of packages is significant, because pip processes '
-    'them in the order\n',
-    '# of appearance. Changing the order has an impact on the overall '
-    'integration\n',
-    '# process, which may cause wedges in the gate later.\n',
-]
-
-
 def key_specifier(a):
     weight = {'>=': 0, '>': 0,
               '===': 1, '==': 1, '~=': 1, '!=': 1,
@@ -160,10 +149,8 @@ def parse_line(req_line, permit_urls=False):
     return Requirement(name, location, specifier, markers, comment, extras)
 
 
-def to_content(reqs, marker_sep=';', line_prefix='', prefix=True):
+def to_content(reqs, marker_sep=';', line_prefix=''):
     lines = []
-    if prefix:
-        lines += _REQS_HEADER
     for req in reqs.reqs:
         lines.append(req.to_line(marker_sep, line_prefix))
     return u''.join(lines)

openstack_requirements/tests/test_requirement.py

@@ -116,8 +116,7 @@ class TestToContent(testtools.TestCase):
              'foo', '', '<=1', "python_version=='2.7'", '# BSD')]),
             marker_sep='!')
         self.assertEqual(
-            ''.join(requirement._REQS_HEADER
-                    + ["foo<=1!python_version=='2.7' # BSD\n"]),
+            "foo<=1!python_version=='2.7' # BSD\n",
             reqs)
 
     def test_location(self):
@@ -125,8 +124,7 @@ class TestToContent(testtools.TestCase):
             [requirement.Requirement(
              'foo', 'file://foo', '', "python_version=='2.7'", '# BSD')]))
         self.assertEqual(
-            ''.join(requirement._REQS_HEADER
-                    + ["file://foo#egg=foo;python_version=='2.7' # BSD\n"]),
+            "file://foo#egg=foo;python_version=='2.7' # BSD\n",
             reqs)