python - whitespace is not allowed between stringprefix and bytesprefix? -

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i not able understand statement in python documentation.

"whitespace not allowed between stringprefix or bytesprefix , rest of literal."

documentation link

a string or bytes prefix u or b precedes literal specify 1 want. sentence saying cannot have whitespace in between prefix , literal itself. in other words:

u "not allowed" b   'still not allowed'

and

u'good' b"also good"

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