During the French Fourth Republic, Lop stood on an electoral platform which consisted of:
the elimination of poverty after 10 pm
the extension of the Roadstead of Brest to Montmartre and of the Boulevard Saint-Michel to the North Sea
the nationalization of brothels
providing a pension to the widow of the unknown soldier
the removal of the last coach from Paris métro trains. He authored numerous booklets, often with evocative titles, such as Thoughts and aphorisms (1951), Pétain and history: What I would have said in my inaugural speech at the Académie française if I had been elected (1957), History of the Latin Quarter (1960–1963), Where is France going? (1961) and Antimaxims (1973). He died and was buried at Évreux, Saint-Sébastien-de-Morsent.