"""Routine to "compile" a .py file to a .pyc (or .pyo) file. This module has intimate knowledge of the format of .pyc files.""" import __builtin__import impimport marshalimport osimport sysimport traceback MAGIC = imp.get_magic() __all__ = ["compile", "main", "PyCompileError"]  class PyCompileError(Exception):    """Exception raised when an error occurs while attempting to    compile the file.     To raise this exception, use         raise PyCompileError(exc_type,exc_value,file[,msg])     where         exc_type:   exception type to be used in error message                    type name can be accesses as class variable                    'exc_type_name'         exc_value:  exception value to be used in error message                    can be accesses as class variable 'exc_value'         file:       name of file being compiled to be used in error message                    can be accesses as class variable 'file'         msg:        string message to be written as error message                    If no value is given, a default exception message will be given,                    consistent with 'standard' py_compile output.                    message (or default) can be accesses as class variable 'msg'     """     def __init__(self, exc_type, exc_value, file, msg=''):        exc_type_name = exc_type.__name__        if exc_type is SyntaxError:            tbtext = ''.join(traceback.format_exception_only(exc_type, exc_value))            errmsg = tbtext.replace('File "<string>"', 'File "%s"' % file)        else:            errmsg = "Sorry: %s: %s" % (exc_type_name,exc_value)         Exception.__init__(self,msg or errmsg,exc_type_name,exc_value,file)         self.exc_type_name = exc_type_name        self.exc_value = exc_value        self.file = file        self.msg = msg or errmsg     def __str__(self):        return self.msg  # Define an internal helper according to the platformif os.name == "mac":    import MacOS    def set_creator_type(file):        MacOS.SetCreatorAndType(file, 'Pyth', 'PYC ')else:    def set_creator_type(file):        pass def wr_long(f, x):    """Internal; write a 32-bit int to a file in little-endian order."""    f.write(chr( x        & 0xff))    f.write(chr((x >> 8)  & 0xff))    f.write(chr((x >> 16) & 0xff))    f.write(chr((x >> 24) & 0xff)) def compile(file, cfile=None, dfile=None, doraise=False):    """Byte-compile one Python source file to Python bytecode.     Arguments:     file:    source filename    cfile:   target filename; defaults to source with 'c' or 'o' appended             ('c' normally, 'o' in optimizing mode, giving .pyc or .pyo)    dfile:   purported filename; defaults to source (this is the filename             that will show up in error messages)    doraise: flag indicating whether or not an exception should be             raised when a compile error is found. If an exception             occurs and this flag is set to False, a string             indicating the nature of the exception will be printed,             and the function will return to the caller. If an             exception occurs and this flag is set to True, a             PyCompileError exception will be raised.     Note that it isn't necessary to byte-compile Python modules for    execution efficiency -- Python itself byte-compiles a module when    it is loaded, and if it can, writes out the bytecode to the    corresponding .pyc (or .pyo) file.     However, if a Python installation is shared between users, it is a    good idea to byte-compile all modules upon installation, since    other users may not be able to write in the source directories,    and thus they won't be able to write the .pyc/.pyo file, and then    they would be byte-compiling every module each time it is loaded.    This can slow down program start-up considerably.     See compileall.py for a script/module that uses this module to    byte-compile all installed files (or all files in selected    directories).     """    f = open(file, 'U')    try:        timestamp = long(os.fstat(f.fileno()).st_mtime)    except AttributeError:        timestamp = long(os.stat(file).st_mtime)    codestring = f.read()    f.close()    if codestring and codestring[-1] != '\n':        codestring = codestring + '\n'    try:        codeobject = __builtin__.compile(codestring, dfile or file,'exec')    except Exception,err:        py_exc = PyCompileError(err.__class__,err.args,dfile or file)        if doraise:            raise py_exc        else:            sys.stderr.write(py_exc.msg + '\n')            return    if cfile is None:        cfile = file + (__debug__ and 'c' or 'o')    fc = open(cfile, 'wb')    fc.write('\0\0\0\0')    wr_long(fc, timestamp)    marshal.dump(codeobject, fc)    fc.flush()    fc.seek(0, 0)    fc.write(MAGIC)    fc.close()    set_creator_type(cfile) def main(args=None):    """Compile several source files.     The files named in 'args' (or on the command line, if 'args' is    not specified) are compiled and the resulting bytecode is cached    in the normal manner.  This function does not search a directory    structure to locate source files; it only compiles files named    explicitly.     """    if args is None:        args = sys.argv[1:]    for filename in args:        try:            compile(filename, doraise=True)        except PyCompileError,err:            sys.stderr.write(err.msg) if __name__ == "__main__":    main()