routine to compile a py file to a pyc file this module has intimate knowledge of the format of pyc files exception raised when an error occurs while attempting to compile the file to raise this exception use raise pycompileerrorexctype excvalue file msg where exctype exception type to be used in error message type name can be accesses as class variable exctypename excvalue exception value to be used in error message can be accesses as class variable excvalue 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 pycompile output message or default can be accesses as class variable msg bytecompile one python source file to python bytecode param file the source file name param cfile the target byte compiled file name when not given this defaults to the pep 3147pep 488 location param dfile purported file name i e the file name that shows up in error messages defaults to the source file name param 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 param optimize the optimization level for the compiler valid values are 1 0 1 and 2 a value of 1 means to use the optimization level of the current interpreter as given by o command line options param invalidationmode param quiet return full output with false or 0 errors only with 1 and no output with 2 return path to the resulting byte compiled file note that it isn t necessary to bytecompile python modules for execution efficiency python itself bytecompiles a module when it is loaded and if it can writes out the bytecode to the corresponding pyc file however if a python installation is shared between users it is a good idea to bytecompile 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 file and then they would be bytecompiling every module each time it is loaded this can slow down program startup considerably see compileall py for a scriptmodule that uses this module to bytecompile all installed files or all files in selected directories do note that fileexistserror is raised if cfile ends up pointing at a nonregular file or symlink because the compilation uses a file renaming the resulting file would be regular and thus not the same type of file as it was previously 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 byte compile one python source file to python bytecode param file the source file name param cfile the target byte compiled file name when not given this defaults to the pep 3147 pep 488 location param dfile purported file name i e the file name that shows up in error messages defaults to the source file name param 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 param optimize the optimization level for the compiler valid values are 1 0 1 and 2 a value of 1 means to use the optimization level of the current interpreter as given by o command line options param invalidation_mode param quiet return full output with false or 0 errors only with 1 and no output with 2 return path to the resulting byte compiled file 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 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 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 do note that fileexistserror is raised if cfile ends up pointing at a non regular file or symlink because the compilation uses a file renaming the resulting file would be regular and thus not the same type of file as it was previously
import enum
import importlib._bootstrap_external
import importlib.machinery
import importlib.util
import os
import os.path
import sys
import traceback

__all__ = ["compile", "main", "PyCompileError", "PycInvalidationMode"]


class PyCompileError(Exception):
    

    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


class PycInvalidationMode(enum.Enum):
    TIMESTAMP = 1
    CHECKED_HASH = 2
    UNCHECKED_HASH = 3


def _get_default_invalidation_mode():
    if os.environ.get('SOURCE_DATE_EPOCH'):
        return PycInvalidationMode.CHECKED_HASH
    else:
        return PycInvalidationMode.TIMESTAMP


def compile(file, cfile=None, dfile=None, doraise=False, optimize=-1,
            invalidation_mode=None, quiet=0):
    
    if invalidation_mode is None:
        invalidation_mode = _get_default_invalidation_mode()
    if cfile is None:
        if optimize >= 0:
            optimization = optimize if optimize >= 1 else ''
            cfile = importlib.util.cache_from_source(file,
                                                     optimization=optimization)
        else:
            cfile = importlib.util.cache_from_source(file)
    if os.path.islink(cfile):
        msg = ('{} is a symlink and will be changed into a regular file if '
               'import writes a byte-compiled file to it')
        raise FileExistsError(msg.format(cfile))
    elif os.path.exists(cfile) and not os.path.isfile(cfile):
        msg = ('{} is a non-regular file and will be changed into a regular '
               'one if import writes a byte-compiled file to it')
        raise FileExistsError(msg.format(cfile))
    loader = importlib.machinery.SourceFileLoader('<py_compile>', file)
    source_bytes = loader.get_data(file)
    try:
        code = loader.source_to_code(source_bytes, dfile or file,
                                     _optimize=optimize)
    except Exception as err:
        py_exc = PyCompileError(err.__class__, err, dfile or file)
        if quiet < 2:
            if doraise:
                raise py_exc
            else:
                sys.stderr.write(py_exc.msg + '\n')
        return
    try:
        dirname = os.path.dirname(cfile)
        if dirname:
            os.makedirs(dirname)
    except FileExistsError:
        pass
    if invalidation_mode == PycInvalidationMode.TIMESTAMP:
        source_stats = loader.path_stats(file)
        bytecode = importlib._bootstrap_external._code_to_timestamp_pyc(
            code, source_stats['mtime'], source_stats['size'])
    else:
        source_hash = importlib.util.source_hash(source_bytes)
        bytecode = importlib._bootstrap_external._code_to_hash_pyc(
            code,
            source_hash,
            (invalidation_mode == PycInvalidationMode.CHECKED_HASH),
        )
    mode = importlib._bootstrap_external._calc_mode(file)
    importlib._bootstrap_external._write_atomic(cfile, bytecode, mode)
    return cfile


def main():
    import argparse

    description = 'A simple command-line interface for py_compile module.'
    parser = argparse.ArgumentParser(description=description)
    parser.add_argument(
        '-q', '--quiet',
        action='store_true',
        help='Suppress error output',
    )
    parser.add_argument(
        'filenames',
        nargs='+',
        help='Files to compile',
    )
    args = parser.parse_args()
    if args.filenames == ['-']:
        filenames = [filename.rstrip('\n') for filename in sys.stdin.readlines()]
    else:
        filenames = args.filenames
    for filename in filenames:
        try:
            compile(filename, doraise=True)
        except PyCompileError as error:
            if args.quiet:
                parser.exit(1)
            else:
                parser.exit(1, error.msg)
        except OSError as error:
            if args.quiet:
                parser.exit(1)
            else:
                parser.exit(1, str(error))


if __name__ == "__main__":
    main()