Move core/pip dependencies to the separate "dependencies" module

platformio/compat.py

@@ -17,6 +17,7 @@
 import importlib.util
 import inspect
 import locale
+import os
 import shlex
 import sys
 
@@ -45,6 +46,7 @@ else:
 
 
 PY2 = sys.version_info[0] == 2  # DO NOT REMOVE IT. ESP8266/ESP32 depend on it
+PY36 = sys.version_info[0:2] == (3, 6)
 IS_CYGWIN = sys.platform.startswith("cygwin")
 IS_WINDOWS = WINDOWS = sys.platform.startswith("win")
 IS_MACOS = sys.platform.startswith("darwin")
@@ -132,3 +134,12 @@ def path_to_unicode(path):
     and custom device monitor filters
     """
     return path
+
+
+def is_proxy_set(socks=False):
+    for var in ("HTTP_PROXY", "HTTPS_PROXY", "ALL_PROXY"):
+        value = os.getenv(var, os.getenv(var.lower()))
+        if not value or (socks and not value.startswith("socks5://")):
+            continue
+        return True
+    return False