Move impotrs into methods for even more namespace tidyness

boot.py

@@ -14,12 +14,6 @@
 
 """µnit - Configurable initialisation system for MicroPython/ESP"""
 
-import gc
-import json
-import network
-import os
-import webrepl
-
 # Set of configuration schemas provided by µnit itself
 #  First level: category -> (human-readable name, dict of settings)
 #  Second level: setting key -> (human-readable name, type, choices, default)
@@ -60,6 +54,8 @@ class _MynitConfig:
         self._load()
 
     def _make_dir(self):
+        import os
+
         try:
             os.stat(self._dir)
         except OSError:
@@ -68,6 +64,8 @@ class _MynitConfig:
 
     def _load(self):
         """Load cached data from data directory."""
+        import json
+
         # Create data directory if it doesn't exist yet
         self._make_dir()
 
@@ -90,6 +88,8 @@ class _MynitConfig:
             self._config = {}
 
     def _save(self):
+        import json
+
         """Save cached data to data directory."""
         # Create data directory if it doesn't exist yet
         self._make_dir()
@@ -161,6 +161,8 @@ class _MynitBoot:
         print("Boot finished")
 
     def setup_wifi(self):
+        import network
+
         # Setup wifi
         if self._config["wifi"]["essid"]:
             if self._config["wifi"]["mode"] == "sta":
@@ -198,6 +200,8 @@ class _MynitBoot:
                     print("Wifi configured as %s" % (nic.ifconfig(),))
 
     def setup_webrepl(self):
+        import webrepl
+
         # Start webrepl if enabled
         if self._config["webrepl"]["enabled"]:
             print("Starting web REPL on port %d" % self._config["webrepl"]["port"])
@@ -219,4 +223,6 @@ if __name__ == "__main__":
     del _MYNIT_SCHEMAS, _MynitBoot, _MynitConfig
 
     # Forcibly clean up before handing overto main.py
-    gc.collect()
+    # fmt: off
+    import gc; gc.collect(); del gc
+    # fmt: on