随着 python3 的增加或减少从动态列表中提取元素

Question

你好，我有一个动态列表，它根据从具有 BeautifulSoup

的站点提取的数据相应地增加或减少

mylist = [a,b,c,d,.......]

如何使以下 fstring 随着列表的增加或减少而动态变化？

fstr = print(f"the forecast for the week is (choose number): {nl}1. {mylist[0]}{nl}2. {mylist[1]}{nl}3. {mylist[2]}{nl}4. {mylist[3]}{nl}5. Show all week")

如您所见，我希望 mylist 的元素在 fstring 中由 \nl（新行）分隔，而不是将其连接到字符串。这可能吗？

输出是

the forecast for the week is (choose number): 
1. Tuesday 08  2022
2. Wednesday 09  2022
3. Thursday 10  2022
4. Friday 11  2022

Answer 1

您可以为您的列表编写一个循环并将打印语句放入其中。类似于：

my_list = ["a","b","c"]
print(f"the forecast for the week is (choose number):")
for idx, word in enumerate(my_list):
    print(f"{str(idx)}. {word}")
print(f"{str(len(my_list))}. Show all week")

这对于您的列表来说应该是动态的

Answer 2

您可以使用 list comprehension 和 enumerate() 创建动态列表和 join() 换行符的元素：

mylist = ['Tuesday 08  2022','Wednesday 09  2022','Thursday 10  2022','Friday 11  2022']

data = '\n'.join([f"{i}. {e}" for i,e in enumerate(mylist,start=1)])

print(f"the forecast for the week is (choose number):\n{data}")

输出

the forecast for the week is (choose number):
1. Tuesday 08  2022
2. Wednesday 09  2022
3. Thursday 10  2022
4. Friday 11  2022

随着 python3 的增加或减少从动态列表中提取元素

Extract elements from dynamic list as increases or decreases in python3

python

iteration

list

beautifulsoup

python-3.8

输出