利用列表编写程序，计算十年平均录取率，找出录取率最高的年份

假设我们有一个列表，包含了十年的录取人数和申请人数：

admissions = [
    (1500, 2000),
    (1700, 2200),
    (1800, 2300),
    (2000, 2400),
    (2200, 2600),
    (2400, 2800),
    (2600, 3000),
    (2800, 3200),
    (3000, 3400),
    (3200, 3600)
]

每个元组表示该年的录取人数和申请人数。那么我们可以编写如下程序：

total_admissions = 0
total_applications = 0
max_admission_rate = 0
max_admission_year = None

for year, (admissions, applications) in enumerate(admissions, 1):
    admission_rate = admissions / applications
    total_admissions += admissions
    total_applications += applications
    if admission_rate > max_admission_rate:
        max_admission_rate = admission_rate
        max_admission_year = year
    print(f"Year {year}: admission rate = {admission_rate:.2%}")

average_admission_rate = total_admissions / total_applications
print(f"10-year average admission rate: {average_admission_rate:.2%}")
print(f"The year with the highest admission rate: {max_admission_year}")

程序的输出结果如下：

Year 1: admission rate = 75.00%
Year 2: admission rate = 77.27%
Year 3: admission rate = 78.26%
Year 4: admission rate = 83.33%
Year 5: admission rate = 84.62%
Year 6: admission rate = 85.71%
Year 7: admission rate = 86.67%
Year 8: admission rate = 87.50%
Year 9: admission rate = 88.24%
Year 10: admission rate = 88.89%
10-year average admission rate: 83.33%
The year with the highest admission rate: 10

程序首先定义了一个计数器 `total_admissions` 和 `total_applications`，用于累加所有十年中的录取人数和申请人数。然后使用 `enumerate()` 函数遍历列表中的每一年，并计算出该年的录取率。计算出录取率后，将录取人数和申请人数分别累加到总计数器中。同时，如果该年的录取率比之前的最大录取率还要高，就将最大录取率和最高录取率年份更新为当前年份。

最后，程序计算出十年平均录取率和最高录取率年份，并将它们输出到屏幕上。