Minor fixes and cleanup

- remove `object` inheritance
- remove `__future__` imports
- remove `six` checks and conditional imports
- flat out a few for loops
- fix `dir` is a reserved keyword
- few more nitpick fixes

Author: AndreMiras

pythonforandroid/archs.py

@@ -8,7 +8,7 @@
 from pythonforandroid.util import BuildInterruptingException, build_platform
 
 
-class Arch(object):
+class Arch:
 
     toolchain_prefix = None
     '''The prefix for the toolchain dir in the NDK.'''
@@ -46,7 +46,6 @@ class Arch(object):
     ]
 
     def __init__(self, ctx):
-        super().__init__()
         self.ctx = ctx
 
         # Allows injecting additional linker paths used by any recipe.

pythonforandroid/bdistapk.py

@@ -1,4 +1,3 @@
-from __future__ import print_function
 from setuptools import Command
 
 import sys

pythonforandroid/bootstrap.py

@@ -63,7 +63,7 @@ def rank_bootstrap(bootstrap):
             return 1
 
 
-class Bootstrap(object):
+class Bootstrap:
     '''An Android project template, containing recipe stuff for
     compilation and templated fields for APK info.
     '''
@@ -294,15 +294,15 @@ def distribute_libs(self, arch, src_dirs, wildcard='*', dest_dir="libs"):
         tgt_dir = join(dest_dir, arch.arch)
         ensure_dir(tgt_dir)
         for src_dir in src_dirs:
-            for lib in glob.glob(join(src_dir, wildcard)):
-                shprint(sh.cp, '-a', lib, tgt_dir)
+            libs = glob.glob(join(src_dir, wildcard))
+            shprint(sh.cp, '-a', *libs, tgt_dir)
 
     def distribute_javaclasses(self, javaclass_dir, dest_dir="src"):
         '''Copy existing javaclasses from build dir to current dist dir.'''
         info('Copying java files')
         ensure_dir(dest_dir)
-        for filename in glob.glob(javaclass_dir):
-            shprint(sh.cp, '-a', filename, dest_dir)
+        filenames = glob.glob(javaclass_dir)
+        shprint(sh.cp, '-a', *filenames, dest_dir)
 
     def distribute_aars(self, arch):
         '''Process existing .aar bundles and copy to current dist dir.'''
@@ -335,8 +335,7 @@ def _unpack_aar(self, aar, arch):
             debug("  to {}".format(so_tgt_dir))
             ensure_dir(so_tgt_dir)
             so_files = glob.glob(join(so_src_dir, '*.so'))
-            for f in so_files:
-                shprint(sh.cp, '-a', f, so_tgt_dir)
+            shprint(sh.cp, '-a', *so_files, so_tgt_dir)
 
     def strip_libraries(self, arch):
         info('Stripping libraries')

pythonforandroid/bootstraps/common/build/build.py

@@ -1,7 +1,5 @@
 #!/usr/bin/env python3
 
-from __future__ import print_function
-
 import json
 from os.path import (
     dirname, join, isfile, realpath,

pythonforandroid/build.py

@@ -1,5 +1,3 @@
-from __future__ import print_function
-
 from os.path import (
     abspath, join, realpath, dirname, expanduser, exists,
     split, isdir
@@ -79,7 +77,7 @@ def get_available_apis(sdk_dir):
     return apis
 
 
-class Context(object):
+class Context:
     '''A build context. If anything will be built, an instance this class
     will be instantiated and used to hold all the build state.'''
 
@@ -132,34 +130,33 @@ def templates_dir(self):
     @property
     def libs_dir(self):
         # Was previously hardcoded as self.build_dir/libs
-        dir = join(self.build_dir, 'libs_collections',
-                   self.bootstrap.distribution.name)
-        ensure_dir(dir)
-        return dir
+        directory = join(self.build_dir, 'libs_collections',
+                         self.bootstrap.distribution.name)
+        ensure_dir(directory)
+        return directory
 
     @property
     def javaclass_dir(self):
         # Was previously hardcoded as self.build_dir/java
-        dir = join(self.build_dir, 'javaclasses',
-                   self.bootstrap.distribution.name)
-        ensure_dir(dir)
-        return dir
+        directory = join(self.build_dir, 'javaclasses',
+                         self.bootstrap.distribution.name)
+        ensure_dir(directory)
+        return directory
 
     @property
     def aars_dir(self):
-        dir = join(self.build_dir, 'aars', self.bootstrap.distribution.name)
-        ensure_dir(dir)
-        return dir
+        directory = join(self.build_dir, 'aars', self.bootstrap.distribution.name)
+        ensure_dir(directory)
+        return directory
 
     @property
     def python_installs_dir(self):
-        dir = join(self.build_dir, 'python-installs')
-        ensure_dir(dir)
-        return dir
+        directory = join(self.build_dir, 'python-installs')
+        ensure_dir(directory)
+        return directory
 
     def get_python_install_dir(self):
-        dir = join(self.python_installs_dir, self.bootstrap.distribution.name)
-        return dir
+        return join(self.python_installs_dir, self.bootstrap.distribution.name)
 
     def setup_dirs(self, storage_dir):
         '''Calculates all the storage and build dirs, and makes sure
@@ -264,7 +261,7 @@ def prepare_build_environment(self,
             possible_dirs = glob.glob(expanduser(join(
                 '~', '.buildozer', 'android', 'platform', 'android-sdk-*')))
             possible_dirs = [d for d in possible_dirs if not
-                             (d.endswith('.bz2') or d.endswith('.gz'))]
+                             d.endswith(('.bz2', '.gz'))]
             if possible_dirs:
                 info('Found possible SDK dirs in buildozer dir: {}'.format(
                     ', '.join([d.split(os.sep)[-1] for d in possible_dirs])))
@@ -427,15 +424,13 @@ def prepare_build_environment(self,
         for executable in ("pkg-config", "autoconf", "automake", "libtoolize",
                            "tar", "bzip2", "unzip", "make", "gcc", "g++"):
             if not sh.which(executable):
-                warning("Missing executable: {} is not installed".format(
-                    executable))
+                warning(f"Missing executable: {executable} is not installed")
 
         if not ok:
             raise BuildInterruptingException(
                 'python-for-android cannot continue due to the missing executables above')
 
     def __init__(self):
-        super().__init__()
         self.include_dirs = []
 
         self._build_env_prepared = False
@@ -605,23 +600,16 @@ def build_recipes(build_order, python_modules, ctx, project_dir,
         ignore_setup_py=ignore_project_setup_py
     )
 
-    return
-
 
 def project_has_setup_py(project_dir):
-    if project_dir is not None and \
-            (os.path.exists(os.path.join(project_dir,
-                            "setup.py")) or
-             os.path.exists(os.path.join(project_dir,
-                            "pyproject.toml"))
-            ):
-        return True
-    return False
+    return (project_dir is not None and
+            (exists(join(project_dir, "setup.py")) or
+             exists(join(project_dir, "pyproject.toml"))
+            ))
 
 
 def run_setuppy_install(ctx, project_dir, env=None):
-    if env is None:
-        env = dict()
+    env = env or {}
 
     with current_directory(project_dir):
         info('got setup.py or similar, running project install. ' +
@@ -1076,5 +1064,4 @@ def copylibs_function(soname, objs_paths, extra_link_dirs=[], env=None):
                             '\n\t'.join(needed_libs))
 
     print('Copying libraries')
-    for lib in sofiles:
-        shprint(sh.cp, lib, dest)
+    shprint(sh.cp, *sofiles, dest)

pythonforandroid/distribution.py

@@ -7,7 +7,7 @@
 from shutil import rmtree
 
 
-class Distribution(object):
+class Distribution:
     '''State container for information about a distribution (i.e. an
     Android project).
 

pythonforandroid/graph.py

@@ -160,7 +160,7 @@ def obvious_conflict_checker(ctx, name_tuples, blacklist=None):
         current_to_be_added = list(to_be_added)
         to_be_added = []
         for (added_tuple, adding_recipe) in current_to_be_added:
-            assert(type(added_tuple) == tuple)
+            assert type(added_tuple) == tuple
             if len(added_tuple) > 1:
                 # No obvious commitment in what to add, don't check it itself
                 # but throw it into deps for later comparing against

pythonforandroid/logger.py

@@ -7,19 +7,6 @@
 from collections import defaultdict
 from colorama import Style as Colo_Style, Fore as Colo_Fore
 
-# six import left for Python 2 compatibility during initial Python version check
-import six
-
-# This codecs change fixes a bug with log output, but crashes under python3
-if not six.PY3:
-    import codecs
-    stdout = codecs.getwriter('utf8')(stdout)
-    stderr = codecs.getwriter('utf8')(stderr)
-
-if six.PY2:
-    unistr = unicode  # noqa F821
-else:
-    unistr = str
 
 # monkey patch to show full output
 sh.ErrorReturnCode.truncate_cap = 999999
@@ -61,7 +48,7 @@ def format(self, record):
 error = logger.error
 
 
-class colorama_shim(object):
+class colorama_shim:
 
     def __init__(self, real):
         self._dict = defaultdict(str)
@@ -114,12 +101,12 @@ def shorten_string(string, max_width):
         return string
     visible = max_width - 16 - int(log10(string_len))
     # expected suffix len "...(and XXXXX more)"
-    if not isinstance(string, unistr):
-        visstring = unistr(string[:visible], errors='ignore')
+    if not isinstance(string, str):
+        visstring = str(string[:visible], errors='ignore')
     else:
         visstring = string[:visible]
     return u''.join((visstring, u'...(and ',
-                     unistr(string_len - visible), u' more)'))
+                     str(string_len - visible), u' more)'))
 
 
 def get_console_width():

pythonforandroid/recipe.py

@@ -1,7 +1,7 @@
 from os.path import basename, dirname, exists, isdir, isfile, join, realpath, split
 import glob
 from shutil import rmtree
-from six import PY2, with_metaclass
+from six import with_metaclass
 
 import hashlib
 from re import match
@@ -22,26 +22,17 @@
 
 
 def import_recipe(module, filename):
-    if PY2:
-        import imp
-        import warnings
-        with warnings.catch_warnings():
-            # ignores warnings raised by hierarchical module names
-            # (names containing dots) on Python 2
-            warnings.simplefilter("ignore", RuntimeWarning)
-            return imp.load_source(module, filename)
+    # Python 3.5+
+    import importlib.util
+    if hasattr(importlib.util, 'module_from_spec'):
+        spec = importlib.util.spec_from_file_location(module, filename)
+        mod = importlib.util.module_from_spec(spec)
+        spec.loader.exec_module(mod)
+        return mod
     else:
-        # Python 3.5+
-        import importlib.util
-        if hasattr(importlib.util, 'module_from_spec'):
-            spec = importlib.util.spec_from_file_location(module, filename)
-            mod = importlib.util.module_from_spec(spec)
-            spec.loader.exec_module(mod)
-            return mod
-        else:
-            # Python 3.3 and 3.4:
-            from importlib.machinery import SourceFileLoader
-            return SourceFileLoader(module, filename).load_module()
+        # Python 3.3 and 3.4:
+        from importlib.machinery import SourceFileLoader
+        return SourceFileLoader(module, filename).load_module()
 
 
 class RecipeMeta(type):

pythonforandroid/recipes/android/__init__.py

@@ -1,4 +1,3 @@
-from __future__ import unicode_literals
 from pythonforandroid.recipe import CythonRecipe, IncludedFilesBehaviour
 from pythonforandroid.util import current_directory
 from pythonforandroid import logger