py_compile

Routine to "compile" a .py file to a .pyc file.

This module has intimate knowledge of the format of .pyc files.

Classes

PyCompileError

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'

with_traceback(...)

  Exception.with_traceback(tb) --
      set self.__traceback__ to tb and return self.

args = <attribute 'args' of 'BaseException' objects>

PycInvalidationMode

An enumeration.

CHECKED_HASH = <PycInvalidationMode.CHECKED_HASH: 2>

TIMESTAMP = <PycInvalidationMode.TIMESTAMP: 1>

UNCHECKED_HASH = <PycInvalidationMode.UNCHECKED_HASH: 3>

name = <types.DynamicClassAttribute object at 0x7f0227ac4b80>
  The name of the Enum member.

value = <types.DynamicClassAttribute object at 0x7f0227ac4bb0>
  The value of the Enum member.

Functions

compile

compile(file, cfile=None, dfile=None, doraise=False, optimize=-1, invalidation_mode=None, quiet=0)

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.

main

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 '-' is the only parameter in args, the list of
      files is taken from standard input.

Modules