Unicode String Quotes

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When expressing a regular character literal, you simply use single quotes: ‘This is a regular character string literal’. When expressing a Unicode character literal, you need to specify the character N (for National) as a prefix: N’This is a Unicode character string literal’.
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Itzik Ben-Gan (Microsoft SQL Server 2012: T-SQL Fundamentals)
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One of the compelling reasons to switch to Python 3.3+ is that Unicode object storage is significantly cheaper than it is in Python 2.7. If you mainly handle lots of strings and they eat a lot of RAM, definitely consider a move to Python 3.3+. You get this RAM saving absolutely for free.
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Micha Gorelick (High Performance Python: Practical Performant Programming for Humans)