5.21.2 Parsing Rules
When operating in non-POSIX mode, shlex will try to obey to
the following rules.
- Quote characters are not recognized within words
      (Do"Not"Separateis parsed as the single wordDo"Not"Separate);
- Escape characters are not recognized;
- Enclosing characters in quotes preserve the literal value of
      all characters within the quotes;
- Closing quotes separate words ("Do"Separateis parsed
      as"Do"andSeparate);
- If whitespace_split is False, any character not
      declared to be a word character, whitespace, or a quote will be
      returned as a single-character token. If it isTrue,
      shlex will only split words in whitespaces;
- EOF is signaled with an empty string ('');
- It's not possible to parse empty strings, even if quoted.
When operating in POSIX mode, shlex will try to obey to the
following parsing rules.
- Quotes are stripped out, and do not separate words
      ("Do"Not"Separate"is parsed as the single wordDoNotSeparate);
- Non-quoted escape characters (e.g. "\")
      preserve the literal value of the next character that follows;
- Enclosing characters in quotes which are not part of
      escapedquotes (e.g. "'") preserve the literal
      value of all characters within the quotes;
- Enclosing characters in quotes which are part of
      escapedquotes (e.g. """) preserves the literal
      value of all characters within the quotes, with the exception of
      the characters mentioned in escape. The escape characters
      retain its special meaning only when followed by the quote in use,
      or the escape character itself. Otherwise the escape character
      will be considered a normal character.
- EOF is signaled with a None value;
- Quoted empty strings ('') are allowed;
Release 2.4.4, documentation updated on 18 October 2006.
 
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