mirror of
https://github.com/python/cpython.git
synced 2025-11-04 11:49:12 +00:00
68 lines
2.3 KiB
Python
68 lines
2.3 KiB
Python
"""Routine to "compile" a .py file to a .pyc (or .pyo) file.
|
|
|
|
This module has intimate knowledge of the format of .pyc files.
|
|
"""
|
|
|
|
import imp
|
|
MAGIC = imp.get_magic()
|
|
|
|
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):
|
|
"""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)
|
|
|
|
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).
|
|
|
|
"""
|
|
import os, marshal, __builtin__
|
|
f = open(file)
|
|
try:
|
|
timestamp = os.fstat(file.fileno())
|
|
except AttributeError:
|
|
timestamp = long(os.stat(file)[8])
|
|
codestring = f.read()
|
|
f.close()
|
|
if codestring and codestring[-1] != '\n':
|
|
codestring = codestring + '\n'
|
|
codeobject = __builtin__.compile(codestring, dfile or file, 'exec')
|
|
if not cfile:
|
|
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()
|
|
if os.name == 'mac':
|
|
import macfs
|
|
macfs.FSSpec(cfile).SetCreatorType('Pyth', 'PYC ')
|
|
macfs.FSSpec(file).SetCreatorType('Pyth', 'TEXT')
|