[4] In 1997, at 24, Piolle was a parliamentary candidate for the eighth district of Isère as a Miscellaneous left, he won 1.35% of the votes.

[6] In June 2012, Piolle was a parliamentary candidate for the first district of Isère as a member of EELV, he won 7.7% of votes.

[9][10] He was elected during a city council session on April 4, 2014, succeeding Michel Destot (PS) as mayor of Grenoble.

[12] After winning the election, Piolle declined to run for president of Grenoble-Alpes Métropole, and resigned from his position as a regional councilor of Rhône-Alpes.

In response, Minister of the Interior Gérald Darmanin filed an objection against the burkini permit.