diff --git a/httpie/context.py b/httpie/context.py
index 8dcc82ce..b0f32c26 100644
--- a/httpie/context.py
+++ b/httpie/context.py
@@ -119,10 +119,6 @@ class Environment:
             self._devnull = open(os.devnull, 'w+')
         return self._devnull
 
-    @devnull.setter
-    def devnull(self, value):
-        self._devnull = value
-
     def log_error(self, msg, level='error'):
         assert level in ['error', 'warning']
         self._orig_stderr.write(f'\n{self.program_name}: {level}: {msg}\n\n')
diff --git a/httpie/downloads.py b/httpie/downloads.py
index bd53684d..0ae8040c 100644
--- a/httpie/downloads.py
+++ b/httpie/downloads.py
@@ -2,7 +2,6 @@
 Download mode implementation.
 
 """
-import errno
 import mimetypes
 import os
 import re
@@ -150,16 +149,8 @@ def trim_filename(filename: str, max_len: int) -> str:
 
 def get_filename_max_length(directory: str) -> int:
     max_len = 255
-    try:
-        pathconf = os.pathconf
-    except AttributeError:
-        pass  # non-posix
-    else:
-        try:
-            max_len = pathconf(directory, 'PC_NAME_MAX')
-        except OSError as e:
-            if e.errno != errno.EINVAL:
-                raise
+    if hasattr(os, 'pathconf') and 'PC_NAME_MAX' in os.pathconf_names:
+        max_len = os.pathconf(directory, 'PC_NAME_MAX')
     return max_len
 
 
diff --git a/httpie/output/writer.py b/httpie/output/writer.py
index 94d51cb5..d239e503 100644
--- a/httpie/output/writer.py
+++ b/httpie/output/writer.py
@@ -39,7 +39,7 @@ def write_message(
     }
     try:
         if env.is_windows and 'colors' in args.prettify:
-            write_stream_with_colors_win_py3(**write_stream_kwargs)
+            write_stream_with_colors_win(**write_stream_kwargs)
         else:
             write_stream(**write_stream_kwargs)
     except OSError as e:
@@ -69,7 +69,7 @@ def write_stream(
             outfile.flush()
 
 
-def write_stream_with_colors_win_py3(
+def write_stream_with_colors_win(
     stream: 'BaseStream',
     outfile: TextIO,
     flush: bool
diff --git a/tests/test_sessions.py b/tests/test_sessions.py
index be249292..9e4fec75 100644
--- a/tests/test_sessions.py
+++ b/tests/test_sessions.py
@@ -189,7 +189,7 @@ class TestSession(SessionTestBase):
                   httpbin.url + '/get', env=self.env())
         assert HTTP_OK in r2
 
-        # FIXME: Authorization *sometimes* is not present on Python3
+        # FIXME: Authorization *sometimes* is not present
         assert (r2.json['headers']['Authorization']
                 == HTTPBasicAuth.make_header('test', UNICODE))
         # httpbin doesn't interpret utf8 headers