all: Rename "sys" module to "usys".

This is consistent with the other 'micro' modules and allows implementing
additional features in Python via e.g. micropython-lib's sys.

Note this is a breaking change (not backwards compatible) for ports which
do not enable weak links, as "import sys" must now be replaced with
"import usys".

3 files changed, 9 insertions, 6 deletions

diff --git a/tests/misc/print_exception.py b/tests/misc/print_exception.py
index f26c1fd5a..9b3467b0a 100644
--- a/tests/misc/print_exception.py
+++ b/tests/misc/print_exception.py
@@ -1,10 +1,10 @@
-import sys
-
 try:
     try:
         import uio as io
+        import usys as sys
     except ImportError:
         import io
+        import sys
 except ImportError:
     print("SKIP")
     raise SystemExit
diff --git a/tests/misc/sys_atexit.py b/tests/misc/sys_atexit.py
index e9c5693f9..141b24cc9 100644
--- a/tests/misc/sys_atexit.py
+++ b/tests/misc/sys_atexit.py
@@ -1,9 +1,9 @@
 # test sys.atexit() function
 
-import sys
+import usys
 
 try:
-    sys.atexit
+    usys.atexit
 except AttributeError:
     print("SKIP")
     raise SystemExit
@@ -15,7 +15,7 @@ def do_at_exit():
     print("done at exit:", some_var)
 
 
-sys.atexit(do_at_exit)
+usys.atexit(do_at_exit)
 
 some_var = "ok"
 print("done before exit")
diff --git a/tests/misc/sys_exc_info.py b/tests/misc/sys_exc_info.py
index d7e8a2d94..3a8c4a6c8 100644
--- a/tests/misc/sys_exc_info.py
+++ b/tests/misc/sys_exc_info.py
@@ -1,4 +1,7 @@
-import sys
+try:
+    import usys as sys
+except ImportError:
+    import sys
 
 try:
     sys.exc_info