Question

我是Python的新手，我试图向用户询问所需的一些元素，然后要求在单独的行中输入每个元素，然后对该输入进行气泡排序。

import readline
def bubbleSort(alist):
    for passnum in range(len(alist)-1,0,-1):
        for i in range(passnum):
            if alist[i]>alist[i+1]:
                temp = alist[i]
                alist[i] = alist[i+1]
                alist[i+1] = temp

alist = readlines('Enter the list to sort \n', 'r').rstrip()
alist = alist.split(',')

bubbleSort(alist)
print alist.readlines()

如果我将readlines更改为raw_input，则代码正常工作，但输入只进行一行。有人可以帮助我如何指定元素＆＃39;数字以及如何在新行中获得每个输入？

Answer 1

试试这个：

bubbleSort([raw_input('Enter element') for _ in range(input('Enter the number of elements needed'))])

一个班轮应该做的伎俩

EXPLAIN :::

基本上，一旦你撤消列表推导和pythonic格式，我们在这里做的就是三件事。

#Asking for the number of elements needed and making a loop that will repeat that many times
for _ in range(input('Enter the number of elements needed')):

    #in each loop, retrieve an element from the user and put it into a list for later
    listvariable.append(raw_input('enter element'))

#Then at the end we're taking that list and putting it through the bubbleSort
bubbleSort(listvariable)

使用上面一行解决方案中的列表推导简化了代码。

Answer 2

我相信这是您正在寻找的基础知识。

ntimes = raw_input("Enter the number of lines")

ntimes = int(ntimes)

alist = []

while (ntimes > 0):
    ntimes -= 1
    alist.append(raw_input('Enter the list to sort \n').split(','))

print alist

Answer 3

Python 3：

def bubbleSort(alist):
    for passnum in range(len(alist)-1, 0, -1):
        for i in range(passnum):
            if alist[i] > alist[i+1]:
                temp = alist[i]
                alist[i] = alist[i+1]
                alist[i+1] = temp
    return alist

def main():
    lines = []
    print("Enter names (hit enter twice to bubble-sort):")
    while True:
        line = input("%3i: " % (len(lines)+1))
        if not line:
            break
        lines.append(line)
    print("Sorted names:")
    for i, name in enumerate(bubbleSort(lines), 1):
        print("%3i. %s" % (i, name))

main()

输入和输出：

Enter names (hit enter twice to bubble-sort):
  1: Mark
  2: Jim
  3: Kayne
  4: Foobar
  5: Zulu
  6: Anna
  7: Yeti
  8: 
Sorted names:
  1. Anna
  2. Foobar
  3. Jim
  4. Kayne
  5. Mark
  6. Yeti
  7. Zulu

如何指定输入数量以及如何在新行中获取每个输入？

3 个答案: