Question: What era was the show, in which Peter Sellers co-starred with a French actress, popular during?

Context paragraphs:
The Magic Christian (novel): The Magic Christian is a 1959 comic novel by American author Terry Southern (1924–1995) about an odd billionaire who spends most of his time playing elaborate practical jokes on people.  It is known for bringing Southern to the attention of filmmaker Stanley Kubrick, who had received a copy as a gift from Peter Sellers, and subsequently hired him as co-writer for "Dr. Strangelove" (1964) when Kubrick decided to make that film a black comedy/satire, rather than a straightforward thriller.  In 1969, "The Magic Christian" was made into a film starring Peter Sellers and Ringo Starr; the story was much altered and relocated from New York City to London.

The Party (film): The Party is a 1968 American comedy film directed by Blake Edwards, starring Peter Sellers and Claudine Longet.  The film has a very loose structure, and essentially serves as a series of setpieces for Sellers's improvisational comedy talents.  The comedy is based on a fish out of water premise, in which a bungling Indian actor accidentally gets invited to a lavish Hollywood dinner party and "makes terrible mistakes based upon ignorance of Western ways" set in the 1960s.

Claudine Longet: Claudine Georgette Longet (born 29 January 1942) is a French singer, actress, dancer and recording artist who was popular during the 1960s and 1970s.

Ruxton Hayward: Ruxton Hayward was a British eccentric.  In the early 1950s, as a scoutmaster in London, he attempted to recruit acts for a stage show.  He approached Michael Bentine, and then, at Bentine's recommendation, Peter Sellers.  Sellers was so taken with Hayward's appearance -- the man being tall with a bushy red beard, and wearing a Boy Scout uniform with short trousers -- that he used an imitation of Hayward's high-pitched voice for the character Bluebottle in "The Goon Show".  The character became a popular regular on the series, and was often greeted by cheers from the audience.

Peter Sellers: Peter Sellers, CBE (born Richard Henry Sellers; 8 September 1925 – 24 July 1980) was an English film actor, comedian and singer.  He performed in the BBC Radio comedy series "The Goon Show", featured on a number of hit comic songs and became known to a worldwide audience through his many film characterisations, among them Chief Inspector Clouseau in "The Pink Panther" series of films.

Mr. Topaze: Mr. Topaze (also known as I Like Money) is Peter Sellers' directorial debut in 1961.  Starring Sellers, Nadia Gray and Leo McKern, as well as Herbert Lom.  His son Michael Sellers plays in the film in the role of Gaston.  The film is based on the eponymous play by Marcel Pagnol.

Hoffman (film): Hoffman is a 1970 British film directed by Alvin Rakoff and starring Peter Sellers, Sinéad Cusack, Ruth Dunning and Jeremy Bulloch.  It is the tale of an older man (Peter Sellers) who blackmails an attractive young woman (Sinéad Cusack) into spending a week with him in his flat in London.  His hope is that she will forget her crooked fiancé and fall in love with him instead.

The Fiendish Plot of Dr. Fu Manchu: The Fiendish Plot of Dr. Fu Manchu is a 1980 comedy film, primarily notable as the final film of Peter Sellers, David Tomlinson and John Le Mesurier.  Pre-production began with Richard Quine as director.  By the time the film entered production, Piers Haggard had replaced him.  Peter Sellers handled the re-shoots himself.  Based on characters created by Sax Rohmer, the film stars Sellers in the dual role of Fu Manchu, a stereotypical Chinese evil genius, and English country gentleman detective Nayland Smith.  Released only two weeks after Sellers death, the film was a commercial and critical failure.  It was also the final screen appearance for Tomlinson, who retired from acting shortly before its release.

The Life and Death of Peter Sellers: The Life and Death of Peter Sellers is a 2004 British-American television film about the life of English comedian Peter Sellers, based on Roger Lewis's book of the same name.  It was directed by Stephen Hopkins and stars Geoffrey Rush as Sellers, Miriam Margolyes as his mother Peg Sellers, Emily Watson as his first wife Anne Howe, Charlize Theron as his second wife Britt Ekland, John Lithgow as Blake Edwards, Stephen Fry as Maurice Woodruff and Stanley Tucci as Stanley Kubrick.

Trail of the Pink Panther: Trail of the Pink Panther is a 1982 British comedy film starring Peter Sellers for the sixth and final time.  It was the seventh film in "The Pink Panther" series, the first film in the series following Sellers' death and also the last in which he appeared as Inspector Clouseau.  Sellers died before production began.  His performance consists only of deleted scenes from previous films.

Supporting paragraphs: The Party (film) Claudine Longet
Answer: 1960s