python - 如何在python中使用max命令或类似的“内部”命令？答案

【问题标题】：How to use max command or similar "inside" while command in python?python - 如何在python中使用max命令或类似的“内部”命令？
【发布时间】：2017-07-16 14:48:55
【问题描述】：

def main():

    line = input("How many numbers are included? \n")

    numbers_included = int(line)

    i = 0

    sum = 0
    print("Each number should be placed on separate row")
    while i < numbers_included:
        line = input ("")
        number = int(line)
        sum = sum + number
        i = i + 1
    average = sum / numbers_included
    print("Average is",average)
    print("and the biggest digit is", max(number))

main()

如何在上面的代码中打印最大的数字？

提前致谢！

【问题讨论】：

标签： python python-2.7 python-3.x max

【解决方案1】：

如果你想使用max，你需要收集一个可迭代的数字传递给max()：

...
numbers = [] # here
...
while i < numbers_included:
    line = input ("")
    number = int(line)
    numbers.append(number) # here
    ...
average = sum / numbers_included
print("Average is", average)
print("and the biggest digit is", max(numbers))

【讨论】：

【解决方案2】：

我认为在这种情况下不使用while 循环最好使用for 循环。并将数字附加到列表并使用sum() 和max() 列表操作来完成您的工作。

def main():

    line = input("How many numbers are included? \n")

    numbers_included = int(line)
    val_sum = 0
    numbers = []
    print("Each number should be placed on separate row")

    for _ in range(numbers_included):
        line = int(input ())
        numbers.append(line)

    val_sum = sum(numbers)
    average = val_sum / numbers_included
    print("Average is",average)
    print("and the biggest digit is", max(numbers))

main()

【讨论】：

【解决方案3】：

或者，为了有趣和简洁

    if __name__ == "__main__":
        n_lines_str = input("How many numbers are included? \n")
        n_lines = int(n_lines_str )
        print("Each number should be placed on separate row")

        numbers = [int(input()) for i in range(n_lines)]
        mean = sum(numbers) / len(numbers)

        print("Average is {}".format(mean))
        print("Maximum is {}".format(max(numbers)))

【讨论】：

不用打len；你已经知道有多少个数字 (n_lines)。
当然，你知道他们应该是平等的。但是， len 调用是常数时间，这意味着平均值实际上是列表中内容的平均值。否则，我们知道这是一个均值，前提是 len == n_... 但这是一个逻辑级别的间接。