Question: In what year was the film I Am a Camera first adapted as a play?

Context paragraphs:
Sweet Kitty Bellairs (1916 film): Sweet Kitty Bellairs is a 1916 American silent romantic comedy film based on the 1900 novel "The Bath Comedy", by Agnes and Egerton Castle.  The novel was first adapted for the stage in 1903 by David Belasco which was a huge Broadway success for lead actress Henrietta Crosman.  The film version stars Mae Murray and was directed by James Young.

Goodbye, Mr. Chips (1969 film): Goodbye, Mr. Chips is a 1969 American musical film directed by Herbert Ross.  The screenplay by Terence Rattigan is based on James Hilton's 1934 novel "Goodbye, Mr. Chips", which was first adapted for the screen in 1939.

The Magnificent Ambersons: The Magnificent Ambersons is a 1918 novel written by Booth Tarkington which won the 1919 Pulitzer Prize for the novel.  It was the second novel in his "Growth" trilogy, which included "The Turmoil" (1915) and "The Midlander" (1923, retitled "National Avenue" in 1927).  In 1925 the novel was first adapted for film under the title "Pampered Youth".  In 1942 Orson Welles wrote and directed an acclaimed film adaptation of the book.  Welles's original screenplay was the basis of a 2002 TV movie produced by the A&E Network.

Young America (1932 film): Young America is a 1932 American Pre-Code film first adapted for the screen by Maurine Watkins from the play by Fred Ballard (Copyright 1931, Premier Syndicate Hollywood, Sept. 2).  William M. Conselman rewrote the screenplay and Maurine Watkins' name no longer appeared on the credits (per American Film Institute catalog).  The film was directed by Frank Borzage, whose son, Raymond Borzage, plays Edward 'Nutty' Beamish in the film.

Widelux: The Widelux is a fully mechanical swing-lens panoramic camera first developed in Japan in 1958, by Panon Camera Shoko.  There were both 35mm and medium-format models available.  Instead of a shutter, the camera has a slit that exposes the film as the lens pivots on a horizontal arc.  This pivot allows for some distortion effects not available with traditional cameras.  The last Widelux model F8 ended production in 2000.

The Locked Door: The Locked Door is a 1929 American pre-Code drama film directed by George Fitzmaurice and starring Rod LaRocque, Barbara Stanwyck, William "Stage" Boyd, and Betty Bronson.  The film is based on the play "The Sign on the Door" by Channing Pollock.  The play was first adapted for the screen in 1921 as "The Sign on the Door", starring Norma Talmadge.  "The Locked Door" was Barbara Stanwyck's second film appearance, first starring role, and first talking picture.

Christopher Isherwood: Christopher William Bradshaw Isherwood (26 August 1904 – 4 January 1986) was an English-American novelist.  His best-known works include "The Berlin Stories" (1935-39), two semi-autobiographical novellas inspired by Isherwood's time in Weimar Republic Germany.  These enhanced his postwar reputation when they were adapted first into the play "I Am a Camera" (1951), then the 1955 film of the same name, "I Am a Camera (film)"; much later (1966) into the bravura stage musical "Cabaret (musical)" which was acclaimed on Broadway, its unsparing stance being substantially sweetened for the film "Cabaret" (1972).  His novel "A Single Man" was published in 1964.

Condemned To Be Shot: Condemned To Be Shot was an early BBC television drama, broadcast by the BBC Television Service in the United Kingdom on the evening of Saturday 4 March 1939.  It is particularly notable for two reasons – firstly, it was one of the very first plays to be written especially for television, rather than adapted from the theatre or from radio drama.  Secondly, it was the first television production where the camera was made into one of the 'characters' of the piece – the play revolves around the first-person perspective of the character whose viewpoint the camera represents, and who is not otherwise seen, his voice heard only in voiceover.  The play ends with the main character faced with a firing squad.

I Am a Camera (film): I Am a Camera is a British comedy-drama film released in 1955.  Based on "The Berlin Stories" by Christopher Isherwood and the play "I Am a Camera" by John Van Druten, the film is a fictionalized account of Isherwood's time living in Berlin between the World Wars.  Directed by Henry Cornelius from a script by John Collier, "I Am a Camera" stars Laurence Harvey as Isherwood and Julie Harris recreating her Tony Award winning performance as Sally Bowles.

Scott Spencer (writer): Scott Spencer (born September 1, 1945 in Washington, D.C.) is an American author who has written eleven novels.  He also wrote the screenplay for the 1993 movie "Father Hood".  Two of Spencer's novels, "Endless Love" and "Waking the Dead," have been adapted into films.  "Endless Love" was first adapted into a motion picture by Franco Zeffirelli in 1981, and a second adaptation by Shana Feste was released in 2014. " Waking the Dead" was produced by Jodie Foster and directed by Keith Gordon in 2000.  The novels "Endless Love" and "A Ship Made of Paper" have both been nominated for the National Book Award, with "Endless Love" selling over 2 million copies.  Spencer has heavily panned both film adaptations of "Endless Love".

Supporting paragraphs: I Am a Camera (film) Christopher Isherwood
Answer: 1951