PEP 8 + PyFlakes + PyLint fixes

apkkit/base/package.py

+"""Contains the Package class and related helper classes and functions."""
+
 from jinja2 import Template
 import os
 
 
-"""Contains the Package class and related helper classes and functions."""
-
-
-pkginfo_template = Template("""
+PKGINFO_TEMPLATE = Template("""
 # Generated by APK Kit for Adélie Linux
 # {{ builduser }}@{{ buildhost }} {{ builddate }}
 pkgname = {{ package.name }}
@@ -44,8 +43,8 @@ class Package:
 
         :param int size:
             (Recommended) The installed size of the package.  You almost always
-            want to set this to something other than 0 if you don't want unhappy
-            users. :)
+            want to set this to something other than 0 if you don't want
+            unhappy users. :)
 
         :param str url:
             (Optional) The URL of the homepage for the package.
@@ -57,7 +56,7 @@ class Package:
             (Optional) One or more packages that are required to be installed
             to use this package.
         """
-        
+
         self._pkgname = name
         self._pkgver = str(version)
         self._pkgdesc = description or name
@@ -124,14 +123,14 @@ class Package:
         .. note:: To write a file, see the :py:meth:`.write_pkginfo` helper
                   method.
         """
-        return pkginfo_template.render(builduser=os.environ.get('USER', '?'),
+        return PKGINFO_TEMPLATE.render(builduser=os.environ.get('USER', '?'),
                                        buildhost=os.uname().nodename,
                                        package=self)
 
     @classmethod
     def from_pkginfo(cls, buf):
         """Create a new :py:class:`Package` object from an existing PKGINFO.
-        
+
         :param buf:
             The buffer to read from (whether file, StringIO, etc).
 
@@ -152,8 +151,7 @@ class Package:
         params['depends'] = list()
 
         for line in buf.readlines():
-            # XXX TODO make this better
-            if type(line) != str:
+            if not isinstance(line, str):
                 line = line.decode('utf-8')
 
             # Skip comments.

apkkit/io/apkfile.py

+"""I/O classes and helpers for APK files."""
+
 from apkkit.base.package import Package
-import gzip  # Not used, but we need to raise ImportError if gzip isn't built.
+# Not used, but we need to raise ImportError if gzip isn't built.
+import gzip  # pylint: disable=unused-import
 import tarfile
 
+
 class APKFile:
     """Represents an APK file on disk (or in memory)."""
 
     def __init__(self, filename, mode='r'):
         self.tar = tarfile.open(filename, mode)
         self.package = Package.from_pkginfo(self.tar.extractfile('.PKGINFO'))
+
+    @classmethod
+    def create(cls, package, datadir, sign=True, signfile=None, data_hash=True,
+               hash_method='sha1'):
+        """Create an APK file in memory from a package and data directory.
+
+        :param package:
+            A :py:class:`Package` instance that describes the package.
+
+        :param datadir:
+            The path to the directory containing the package's data.
+
+        :param bool sign:
+            Whether to sign the package (default True).
+
+        :param signfile:
+            The path to the GPG key to sign the package with.
+
+        :param bool data_hash:
+            Whether to hash the data (default True).
+
+        :param str hash_method:
+            The hash method to use for hashing the data - default is sha1 to
+            maintain compatibility with upstream apk-tools.
+        """
+        raise NotImplementedError