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".

13 files changed, 49 insertions, 16 deletions

diff --git a/tests/basics/async_await2.py b/tests/basics/async_await2.py
index 1e3164df93..56f77604ac 100644
--- a/tests/basics/async_await2.py
+++ b/tests/basics/async_await2.py
@@ -1,6 +1,9 @@
 # test await expression
 
-import sys
+try:
+    import usys as sys
+except ImportError:
+    import sys
 if sys.implementation.name == 'micropython':
     # uPy allows normal generators to be awaitables
     coroutine = lambda f: f
diff --git a/tests/basics/async_for2.py b/tests/basics/async_for2.py
index aad23a3e5a..4af3be4c6d 100644
--- a/tests/basics/async_for2.py
+++ b/tests/basics/async_for2.py
@@ -1,6 +1,9 @@
 # test waiting within "async for" __anext__ function
 
-import sys
+try:
+    import usys as sys
+except ImportError:
+    import sys
 if sys.implementation.name == 'micropython':
     # uPy allows normal generators to be awaitables
     coroutine = lambda f: f
diff --git a/tests/basics/async_with2.py b/tests/basics/async_with2.py
index 44421ae917..4dd1386240 100644
--- a/tests/basics/async_with2.py
+++ b/tests/basics/async_with2.py
@@ -1,6 +1,9 @@
 # test waiting within async with enter/exit functions
 
-import sys
+try:
+    import usys as sys
+except ImportError:
+    import sys
 if sys.implementation.name == 'micropython':
     # uPy allows normal generators to be awaitables
     coroutine = lambda f: f
diff --git a/tests/basics/attrtuple1.py b/tests/basics/attrtuple1.py
index 78a0fbed1b..249c030bb4 100644
--- a/tests/basics/attrtuple1.py
+++ b/tests/basics/attrtuple1.py
@@ -1,7 +1,10 @@
 # test attrtuple
 # we can't test this type directly so we use sys.implementation object
 
-import sys
+try:
+    import usys as sys
+except ImportError:
+    import sys
 t = sys.implementation
 
 # It can be just a normal tuple on small ports
diff --git a/tests/basics/builtin_callable.py b/tests/basics/builtin_callable.py
index 3ae49f004d..c0a9d0c473 100644
--- a/tests/basics/builtin_callable.py
+++ b/tests/basics/builtin_callable.py
@@ -7,7 +7,10 @@ print(callable([]))
 print(callable("dfsd"))
 
 # modules should not be callabe
-import sys
+try:
+    import usys as sys
+except ImportError:
+    import sys
 print(callable(sys))
 
 # builtins should be callable
diff --git a/tests/basics/builtin_dir.py b/tests/basics/builtin_dir.py
index 1eecbd044b..1f2b498d77 100644
--- a/tests/basics/builtin_dir.py
+++ b/tests/basics/builtin_dir.py
@@ -4,7 +4,10 @@
 print('__name__' in dir())
 
 # dir of module
-import sys
+try:
+    import usys as sys
+except ImportError:
+    import sys
 print('version' in dir(sys))
 
 # dir of type
diff --git a/tests/basics/int_big1.py b/tests/basics/int_big1.py
index 40d16c455b..108e3ee5c9 100644
--- a/tests/basics/int_big1.py
+++ b/tests/basics/int_big1.py
@@ -102,7 +102,10 @@ x = 4611686018427387904 # big
 x = -4611686018427387904 # big
 
 # sys.maxsize is a constant mpz, so test it's compatible with dynamic ones
-import sys
+try:
+    import usys as sys
+except ImportError:
+    import sys
 print(sys.maxsize + 1 - 1 == sys.maxsize)
 
 # test extraction of big int value via mp_obj_get_int_maybe
diff --git a/tests/basics/module2.py b/tests/basics/module2.py
index a135601579..5923a27e08 100644
--- a/tests/basics/module2.py
+++ b/tests/basics/module2.py
@@ -1,6 +1,6 @@
 # uPy behaviour only: builtin modules are read-only
-import sys
+import usys
 try:
-    sys.x = 1
+    usys.x = 1
 except AttributeError:
     print("AttributeError")
diff --git a/tests/basics/python34.py b/tests/basics/python34.py
index 4030db143c..0f6e4bafd0 100644
--- a/tests/basics/python34.py
+++ b/tests/basics/python34.py
@@ -33,9 +33,9 @@ test_syntax("del ()") # can't delete empty tuple (in 3.6 we can)
 
 # from basics/sys1.py
 # uPy prints version 3.4
-import sys
-print(sys.version[:3])
-print(sys.version_info[0], sys.version_info[1])
+import usys
+print(usys.version[:3])
+print(usys.version_info[0], usys.version_info[1])
 
 # from basics/exception1.py
 # in 3.7 no comma is printed if there is only 1 arg (in 3.4-3.6 one is printed)
diff --git a/tests/basics/string_compare.py b/tests/basics/string_compare.py
index 6515809b36..f34879df25 100644
--- a/tests/basics/string_compare.py
+++ b/tests/basics/string_compare.py
@@ -51,7 +51,10 @@ print("1/" <= "1")
 
 # this tests an internal string that doesn't have a hash with a string
 # that does have a hash, but the lengths of the two strings are different
-import sys
+try:
+    import usys as sys
+except ImportError:
+    import sys
 print(sys.version == 'a long string that has a hash')
 
 # this special string would have a hash of 0 but is incremented to 1
diff --git a/tests/basics/sys1.py b/tests/basics/sys1.py
index 095824afaf..0947ea1964 100644
--- a/tests/basics/sys1.py
+++ b/tests/basics/sys1.py
@@ -1,6 +1,9 @@
 # test sys module
 
-import sys
+try:
+    import usys as sys
+except ImportError:
+    import sys
 
 print(sys.__name__)
 print(type(sys.path))
diff --git a/tests/basics/sys_exit.py b/tests/basics/sys_exit.py
index b1f71549db..4d640ae60e 100644
--- a/tests/basics/sys_exit.py
+++ b/tests/basics/sys_exit.py
@@ -1,6 +1,9 @@
 # test sys module's exit function
 
-import sys
+try:
+    import usys as sys
+except ImportError:
+    import sys
 
 try:
     sys.exit
diff --git a/tests/basics/sys_getsizeof.py b/tests/basics/sys_getsizeof.py
index fe1b403e04..4dc919848c 100644
--- a/tests/basics/sys_getsizeof.py
+++ b/tests/basics/sys_getsizeof.py
@@ -1,6 +1,9 @@
 # test sys.getsizeof() function
 
-import sys
+try:
+    import usys as sys
+except ImportError:
+    import sys
 try:
     sys.getsizeof
 except AttributeError: