Which philosophy is associated with the French philosopher, known for his play, which later became a film directed by Vittorio De Sica?
the philosophy of existentialism
Title: The Condemned of Altona (film)
Passage: The Condemned of Altona (Italian: I sequestrati di Altona ) is a 1962 Italian-French drama film directed by Vittorio De Sica.  It is based on the play of the same name by Jean-Paul Sartre.  For this film Vittorio De Sica won the David di Donatello for Best Director.
Title: Jean-Paul Sartre
Passage: Jean-Paul Charles Aymard Sartre ( ; ] ; 21 June 1905 – 15 April 1980) was a French philosopher, playwright, novelist, political activist, biographer, and literary critic.  He was one of the key figures in the philosophy of existentialism and phenomenology, and one of the leading figures in 20th-century French philosophy and Marxism.
Title: Two Women
Passage: Two Women (Italian: La ciociara ] , roughly translated as "The [Woman] from Ciociaria") is a 1960 Italian film directed by Vittorio De Sica.  It tells the story of a woman trying to protect her young daughter from the horrors of war.  The film stars Sophia Loren, Jean-Paul Belmondo, Eleonora Brown, Carlo Ninchi and Andrea Checchi.  The film was adapted by De Sica and Cesare Zavattini from the novel of the same name written by Alberto Moravia.  The story is fictional, but based on actual events during what the Italians call Marocchinate.
Jean-Paul Sartre The Condemned of Altona (film)