德克萨斯州5个宝宝名字的时间跨度（python）

Question

我在Python中有关于德克萨斯州婴儿名字的这个程序。解决了相当多的问题，但卡在计数部分。我将列表转换为字典。输出必须使得程序在用户提供的时间范围内显示前5个最受欢迎的婴儿名称（开始年份，结束年份）。

def count_names(file_data, begin, end, sex):

    import operator as op
    x=[]
    c=[]
    a=[]
    t=[]
    number_names = 5
    for d in range (begin,end+1):
        x.append(str(d))    
    for y in file_data:
        if y[5:9] in x:
            c.append(y)
    for q in c:
        p=q.split(',')
        if (p[1]=='M'):
            t.append(p)
        elif(p[1]=='F'):    
            a.append(p)               
    if(sex=='M'): 
        dm={}
        for h in t:
            dm[h[3]]=h[4]

    elif(sex=='F'): 
        df={}
        for j in a:
            df[j[3]]=j[4]  

def main():
#Open the data file and save the data in a list called file_data. 
#Each element of the list is a string in the format:
# 'TX,GENDER,YEAR_OF_BIRTH,BABY_NAME,OCCURRENCES\n'
    file_data = open('TX19010-2016.csv').readlines()
    sex = 'M'
    cmd = ''
    while cmd != 'quit()':
        cmd = input('> ')
        if cmd == 'girl':
            sex = 'F'
        elif cmd == 'boy':
            sex ='M'
        elif cmd != 'quit':
            years = cmd.split()
            begin = int(years[0])
            if len(years) > 1:
                end = int(years[1])
            else:
                end = begin
            count_names(file_data, begin, end, sex)

main()