shlex.source
This attribute is None
by default. If you assign a string to it, that string will be recognized as a lexical-level inclusion request similar to the source
keyword in various shells. That is, the immediately following token will be opened as a filename and input will be taken from that stream until EOF, at which point the close()
method of that stream will be called and the input source will again become the original input stream. Source requests may be stacked any number of levels deep.
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