字典计算列表中的数字出现次数

a = [1, 2, 3, 1, 1, 3, 6, 9, 6, 9, 9, 1, 2, 2, 2, 6, 6, 6]
b = {}
for j in c:
    if j in b.keys():
        b[j] = b[j] + 1
    else:
        b[j] = 1
for k in b.keys():
    print(“值”, k, "&", “出现次数”, b[k])
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