More specifically, there are two possible value formats that will pass validation: An empty string("") indicating that the user did not enter a value or that the value was removed.
If both the user name and password have not been set, or if a blank character string/null is set, the user will be connected without using the user name and password.
The semantics of empty or non-specified selectors are dependent on the context, and API types that use selectors should document the validity and meaning of them.
設定がない、または空文字列・nullが設定された場合、空文字列をユーザ名として使用し接続します。
If there is no setting, or if a blank character string/null is set, the blank character string will be used as the user name in the connection.
Calling this method with a null name has no effect; if you want to disable all alternate and preferred style sheets, you must pass"", the empty string.
If comments is False(the default), the parsing of comments in the given string will be disabled setting the commenters attribute of the shlex instance to the empty string.
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