imputil.py 文件源码

def _compile(pathname, timestamp):
    """Compile (and cache) a Python source file.

    The file specified by <pathname> is compiled to a code object and
    returned.

    Presuming the appropriate privileges exist, the bytecodes will be
    saved back to the filesystem for future imports. The source file's
    modification timestamp must be provided as a Long value.
    """
    codestring = open(pathname, 'rU').read()
    if codestring and codestring[-1] != '\n':
        codestring = codestring + '\n'
    code = __builtin__.compile(codestring, pathname, 'exec')

    # try to cache the compiled code
    try:
        f = open(pathname + _suffix_char, 'wb')
    except IOError:
        pass
    else:
        f.write('\0\0\0\0')
        f.write(struct.pack('<I', timestamp))
        marshal.dump(code, f)
        f.flush()
        f.seek(0, 0)
        f.write(imp.get_magic())
        f.close()

    return code