inspect: Add initial, mostly dummy, implementation.

Only few most obvious functions are implemented, several more added with
dummy implementation.

The intention of this module will likely always stay to be able to run
software which depends on this module for exceptional parts (like error
reporting), not to actually inspect objects.

inspect/inspect.py

@@ -0,0 +1,59 @@
+import sys
+
+
+def getmembers(obj, pred=None):
+    res = []
+    for name in dir(obj):
+        val = getattr(obj, name)
+        if pred is None or pred(val):
+            res.append((name, val))
+    res.sort()
+    return res
+
+def isfunction(obj):
+    return isinstance(obj, type(isfunction))
+
+def isgeneratorfunction(obj):
+    return isinstance(obj, type(lambda:(yield)))
+
+def isgenerator(obj):
+    return isinstance(obj, type(lambda:(yield)()))
+
+class _Class:
+    def meth(): pass
+_Instance = _Class()
+
+def ismethod(obj):
+    return isinstance(obj, type(_Instance.meth))
+
+def isclass(obj):
+    return isinstance(object, type)
+
+def ismodule(obj):
+    return isinstance(obj, type(sys))
+
+
+def getargspec(func):
+    raise NotImplementedError("This is over-dynamic function, not supported by MicroPython")
+
+def getmodule(obj, _filename=None):
+    return None  # Not known
+
+def getmro(cls):
+    return [cls]
+
+def getsourcefile(obj):
+    return None  # Not known
+
+def getfile(obj):
+    return "<unknown>"
+
+def getsource(obj):
+    return "<source redacted to save you memory>"
+
+
+def currentframe():
+    return None
+
+def getframeinfo(frame, context=1):
+    return ("<unknown>", -1, "<unknown>", [""], 0)