coding test films find most popular decade from a list

gistfile1.py

"""
short coding test to take a list of movies and
their year and rturn the most popular decade
"""


def movies():

    frequency_of_decade = {
                          '1900': 0,
                          '1910': 0,
                          '1920': 0,
                          '1930': 0,
                          '1940': 0,
                          '1950': 0,
                          '1960': 0,
                          '1970': 0,
                          '1980': 0,
                          '1990': 0,
                          '2000': 0,
                          '2010': 0,
                          }

    a = """
    moviea (1971)
    movieb (1981)
    moviec (1991)
    movied (2001)
    moviee (1982)
    movief (1983)
    movief (2009)
    movief (2012)
    """

    for index, char in enumerate(a):
        if char == "(":
            date = a[index + 1:index + 5]
            date = date[:-1] + "0"
            frequency_of_decade[date] = frequency_of_decade[date] + 1
    ans = max(frequency_of_decade, key=frequency_of_decade.get)
    print('Your favorite decade for Film is the', ans, "\'s")
    return ans

if __name__ == '__main__':
    movies()