import shutil

[buran]

'r' denotes it is a raw string. Because you are using back-slash (\) and back-slash is used as escape char it may cause problems with your path. e.g. if you have \t this will be considered tab.

Unless an 'r' or 'R' prefix is present, escape sequences in string and bytes literals are interpreted according to rules similar to those used by Standard C. The recognized escape sequences are:
Escape Sequence Meaning Notes
\newline Backslash and newline ignored
\\ Backslash (\)
\' Single quote (')
\" Double quote (")
\a ASCII Bell (BEL)
\b ASCII Backspace (BS)
\f ASCII Formfeed (FF)
\n ASCII Linefeed (LF)
\r ASCII Carriage Return (CR)
\t ASCII Horizontal Tab (TAB)
\v ASCII Vertical Tab (VT)
\ooo Character with octal value ooo (1,3)
\xhh Character with hex value hh (2,3)


you can use forward-slash instead

shutil.copy('C:/111/AAA.PDF', 'C:/222/AAA.PDF')