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https://github.com/python/cpython.git
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54f22ed30b
who writes: Here is batch 2, as a big collection of CVS context diffs. Along with moving comments into docstrings, i've added a couple of missing docstrings and attempted to make sure more module docstrings begin with a one-line summary. I did not add docstrings to the methods in profile.py for fear of upsetting any careful optimizations there, though i did move class documentation into class docstrings. The convention i'm using is to leave credits/version/copyright type of stuff in # comments, and move the rest of the descriptive stuff about module usage into module docstrings. Hope this is okay.
76 lines
2.6 KiB
Python
76 lines
2.6 KiB
Python
"""Routine to "compile" a .py file to a .pyc (or .pyo) file.
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This module has intimate knowledge of the format of .pyc files.
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"""
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import imp
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MAGIC = imp.get_magic()
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def wr_long(f, x):
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"""Internal; write a 32-bit int to a file in little-endian order."""
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f.write(chr( x & 0xff))
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f.write(chr((x >> 8) & 0xff))
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f.write(chr((x >> 16) & 0xff))
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f.write(chr((x >> 24) & 0xff))
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def compile(file, cfile=None, dfile=None):
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"""Byte-compile one Python source file to Python bytecode.
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Arguments:
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file: source filename
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cfile: target filename; defaults to source with 'c' or 'o' appended
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('c' normally, 'o' in optimizing mode, giving .pyc or .pyo)
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dfile: purported filename; defaults to source (this is the filename
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that will show up in error messages)
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Note that it isn't necessary to byte-compile Python modules for
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execution efficiency -- Python itself byte-compiles a module when
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it is loaded, and if it can, writes out the bytecode to the
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corresponding .pyc (or .pyo) file.
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However, if a Python installation is shared between users, it is a
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good idea to byte-compile all modules upon installation, since
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other users may not be able to write in the source directories,
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and thus they won't be able to write the .pyc/.pyo file, and then
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they would be byte-compiling every module each time it is loaded.
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This can slow down program start-up considerably.
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See compileall.py for a script/module that uses this module to
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byte-compile all installed files (or all files in selected
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directories).
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"""
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import os, marshal, __builtin__
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f = open(file)
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try:
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timestamp = long(os.fstat(f.fileno())[8])
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except AttributeError:
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timestamp = long(os.stat(file)[8])
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codestring = f.read()
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f.close()
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if codestring and codestring[-1] != '\n':
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codestring = codestring + '\n'
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try:
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codeobject = __builtin__.compile(codestring, dfile or file, 'exec')
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except SyntaxError, detail:
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import traceback, sys, string
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lines = traceback.format_exception_only(SyntaxError, detail)
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for line in lines:
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sys.stderr.write(string.replace(line, 'File "<string>"',
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'File "%s"' % (dfile or file)))
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return
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if not cfile:
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cfile = file + (__debug__ and 'c' or 'o')
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fc = open(cfile, 'wb')
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fc.write('\0\0\0\0')
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wr_long(fc, timestamp)
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marshal.dump(codeobject, fc)
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fc.flush()
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fc.seek(0, 0)
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fc.write(MAGIC)
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fc.close()
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if os.name == 'mac':
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import macfs
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macfs.FSSpec(cfile).SetCreatorType('Pyth', 'PYC ')
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