python-3.x - 如何格式化 "for"循环以通过特定的年度日期范围？

Question

我必须执行一个 python 程序来检查从 1987 年到 2012 年的年份，该程序必须告诉我这个范围内有多少年有重复的数字。我正在努力为 1987-2012 年创建一个循环。在执行代码以计算每个数字之前，我必须以某种方式将它们从 int 转换为字符串。

如何将程序重新运行到下一年(例如从 1987 年到 1988 年)？

#years = range(1987,2013)   
year = "1991"


cells = [0,0,0,0,0,0,0,0,0,0]
for x in range(10):
      cells[x] = year.count(str(x))

print("output1=", cells)
print("\n")

for x in range(len(cells)):

    if cells[x] > 1:

        print("for ",year,x,"appears ",cells[x]," times",end=" ")

结果应该是这样的1987没有重复数字for 1988 8 出现2次for 1989 9 出现2次for 1990 9出现2次

Answer 1

扩展 AChampion 的评论，您可以像这样遍历这些年:

start_date = 1987
end_date = 2013
counter = 0
for year in range(start_date, end_date): # Creates an iterable containing years 1987-2013
    # A set can only have unique items, so it will discard duplicates 
    # If the length of the set is less than 4, then it had to discard a duplicate
    if len(set(str(year))) != 4: 
        counter += 1
print("This date range has", counter, "years with duplicate numbers")