What exactly do “u” and “r” string flags do, and what are raw string literals?

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While asking this question, I realized I didn"t know much about raw strings. For somebody claiming to be a Django trainer, this sucks.

I know what an encoding is, and I know what u"" alone does since I get what is Unicode.

• But what does r"" do exactly? What kind of string does it result in?

• And above all, what the heck does ur"" do?

• Finally, is there any reliable way to go back from a Unicode string to a simple raw string?

• Ah, and by the way, if your system and your text editor charset are set to UTF-8, does u"" actually do anything?

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