I couldn't find anything about the parity of an electron. Neither in the german, nor in the spanish and nor in the english version of Wikipedia.
I only found one sentence in the parity article of Wiki:
One way to fix a standard parity operator is to assign the parities of three particles with linearly independent charges B, L and Q. In general one assigns the parity of the most common massive particles, the proton, the neutron and the electron, to be +1. - Wiki
But I cannot find other sources to confirm it.
I do not need it for a special exercise, it's just to understand the whole thing...