Patched "distutils.msvc9compiler.find_vcvarsall" to use the standalone
    compiler build for Python (VCForPython). Fall back to original behavior
    when the standalone compiler is not available.

    Redirect the path of "vcvarsall.bat".

    Known supported compilers
    -------------------------
    Microsoft Visual C++ 9.0:
        Microsoft Visual C++ Compiler for Python 2.7 (x86, amd64)

    Parameters
    ----------
    version: float
        Required Microsoft Visual C++ version.

    Return
    ------
    vcvarsall.bat path: str

def msvc9_find_vcvarsall(version):
    """
    Patched "distutils.msvc9compiler.find_vcvarsall" to use the standalone
    compiler build for Python (VCForPython). Fall back to original behavior
    when the standalone compiler is not available.

    Redirect the path of "vcvarsall.bat".

    Known supported compilers
    -------------------------
    Microsoft Visual C++ 9.0:
        Microsoft Visual C++ Compiler for Python 2.7 (x86, amd64)

    Parameters
    ----------
    version: float
        Required Microsoft Visual C++ version.

    Return
    ------
    vcvarsall.bat path: str
    """
    VC_BASE = r'Software\%sMicrosoft\DevDiv\VCForPython\%0.1f'
    key = VC_BASE % ('', version)
    try:
        # Per-user installs register the compiler path here
        productdir = Reg.get_value(key, "installdir")
    except KeyError:
        try:
            # All-user installs on a 64-bit system register here
            key = VC_BASE % ('Wow6432Node\\', version)
            productdir = Reg.get_value(key, "installdir")
        except KeyError:
            productdir = None

    if productdir:
        vcvarsall = os.path.os.path.join(productdir, "vcvarsall.bat")
        if os.path.isfile(vcvarsall):
            return vcvarsall

    return get_unpatched(msvc9_find_vcvarsall)(version)