compression.py 文件源码

def lzma_pack(source):
    """
    Returns 'source' as a lzma-compressed, self-extracting python script.

    .. note::

        This method uses up more space than the zip_pack method but it has the
        advantage in that the resulting .py file can still be imported into a
        python program.
    """
    import lzma, base64
    out = ""
    # Preserve shebangs (don't care about encodings for this)
    first_line = source.split('\n')[0]
    if analyze.shebang.match(first_line):
        if py3:
            if first_line.rstrip().endswith('python'): # Make it python3
                first_line = first_line.rstrip()
                first_line += '3' #!/usr/bin/env python3
        out = first_line + '\n'
    compressed_source = lzma.compress(source.encode('utf-8'))
    out += 'import lzma, base64\n'
    out += "exec(lzma.decompress(base64.b64decode('"
    out += base64.b64encode(compressed_source).decode('utf-8')
    out += "')))\n"
    return out