Import Upstream version 2.7.18

Tools/compiler/README

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+This directory contains support tools for the Python compiler package,
+which is now part of the standard library.
+
+compile.py	Demo that compiles a Python module into a .pyc file
+		using the pure-Python compiler code.
+
+demo.py		Prints the names of all the methods defined in a module,
+		as a demonstration of walking through the abstract syntax
+		tree produced by the parser.
+
+dumppyc.py	Dumps the contents of a .pyc file, printing 
+		the attributes of the code object followed by a 
+		code disassembly.
+
+regrtest.py	Runs the Python test suite using bytecode generated 
+		by the pure-Python compiler code instead of the
+		builtin compiler.
+