[Python-Dev] this python string literals documentation couldn't explain me: single quote presence inside double quoted string and viceversa. Can Anyone explain me?

[Alok Nayak]

Thanks for you answer sir,
I was thinking its regular expressions(automata) not BNF grammer. Aint I
right ?

And I thought even if it is for human reading, if we write literal grammer
( regular expression, in my view) using documentation, we would end up with
python not allowing strings like"python's rule" and ' python"the master" '

Here I changed the defination of string literal for explaining my thinking,
inserted short-singlequoted-stringitem, short-sq-tstringchar,
short-doublequoted-stringitem and short-dq-stringchar . I think we should
use this in documentation

stringliteral   ::=  [stringprefix](shortstring | longstring)
stringprefix    ::=  "r" | "u" | "ur" | "R" | "U" | "UR" | "Ur" | "uR"
                     | "b" | "B" | "br" | "Br" | "bR" | "BR"
shortstring     ::=  "'" short-singlequoted-stringitem* "'" | '"'
short-doublequoted-stringitem* '"'
longstring      ::=  "'''" longstringitem* "'''"
                     | '"""' longstringitem* '"""'
short-singlequoted-stringitem ::=  short-sq-stringchar | escapeseq
short-doublequoted-stringitem ::=  short-dq-stringchar | escapeseq
longstringitem  ::=  longstringchar | escapeseq
short-sq-tstringchar ::=  <any source character except "\" or newline or
single-quote>
short-dq-stringchar ::=  <any source character except "\" or newline or
double-quote>
longstringchar  ::=  <any source character except "\">
escapeseq       ::=  "\" <any ASCII character>
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