pickle: Add trivial pickle implementation using repr()/exec().

pickle/pickle.py

@@ -0,0 +1,14 @@
+def dump(obj, f):
+    f.write(repr(obj))
+
+def dumps(obj):
+    return repr(obj)
+
+def load(f):
+    s = f.read()
+    return loads(s)
+
+def loads(s):
+    d = {}
+    exec("v=" + s, d)
+    return d["v"]

pickle/setup.py

@@ -0,0 +1,14 @@
+import sys
+# Remove current dir from sys.path, otherwise distutils will peek up our
+# module instead of system.
+sys.path.pop(0)
+from setuptools import setup
+
+setup(name='micropython-pickle',
+      version='0.0.1',
+      description='pickle module to MicroPython',
+      url='https://github.com/micropython/micropython/issues/405',
+      author='Paul Sokolovsky',
+      author_email='micro-python@googlegroups.com',
+      license='MIT',
+      py_modules=['pickle'])

pickle/test_pickle.py

@@ -0,0 +1,7 @@
+import pickle
+import sys
+import io
+
+pickle.dump({1:2}, sys.stdout)
+
+print(pickle.loads("{4:5}"))