The following tokens serve as delimiters in the grammar:
( ) [ ] { } , : . ` = ;
The period can also occur in floating-point and imaginary literals. A sequence of three periods has a special meaning as an ellipsis in slices.
The following printing ASCII characters have special meaning as part of other tokens or are otherwise significant to the lexical analyzer:
' " # \
The following printing ASCII characters are not used in Python. Their occurrence outside string literals and comments is an unconditional error:
@ $ ?