Question

组合字符串并多次打印

假设我有两个列表，我想打印第一个列表的每个元素，然后是第二个列表的每个元素。为了好玩，我还可以在这两个元素之间添加一个单词，例如“和”？

示例：

firstList = (“cats”, “hats”, “rats”)
secondList = (“dogs”, “frogs”, “logs”)

我想要的是什么：

cats and dogs
cats and frogs
cats and logs
hats and dogs
hats and frogs
hats and logs
rats and dogs
etc...

Answer 1

如果我明白你的意思，这应该很容易。

for item1 in firstlist:
    for item2 in secondlist:
        print(item1+ " and "+item2)

Answer 2

您可以将此作为嵌套列表理解

items = ['%s and %s' % (a,b) for b in secondList for a in firstList]

如果您只想打印值，可以插入print声明

ignore = [print('%s and %s' % (a,b)) for b in secondList for a in firstList]

或者如果您更喜欢format

ignore = [print('{0} and {1}'.format(a,b)) for b in secondList for a in firstList]

Answer 3

你可以使用两个for的列表理解：

>>> words = [x + " and " + y for x in firstList for y in secondList]
>>> print(*words, sep="\n")
cats and dogs
cats and frogs
cats and logs
hats and dogs
hats and frogs
hats and logs
rats and dogs
rats and frogs
rats and logs

如果您想枚举列表，可以使用enumerate，如下所示：

>>> words = ["{}: {} and {}".format(i, x, y) for i, (x, y) in enumerate([(x, y) for x in firstList for y in secondList])]
>>> print(*words)
0: cats and dogs
1: cats and frogs
2: cats and logs
3: hats and dogs
4: hats and frogs
5: hats and logs
6: rats and dogs
7: rats and frogs
8: rats and logs

要使编号从1开始，请将"{}: {} and {}".format(i, x, y)更改为"{}: {} and {}".format(i + 1, x, y)。

Answer 4

除了其他答案之外，另一种方法是使用itertools.product。

import itertools

firstList = (“cats”, “hats”, “rats”)
secondList = (“dogs”, “frogs”, “logs”)

for item in itertools.product(firstList, secondList):
  print(item[0] + " and " + item[1])

Python多次组合字符串和打印

4 个答案: