Python 枚举还是其他？

Question

我从遵循此示例的 json 对象开始：

[
  {
    "url": "https://www.Whosebug_greatquestions.com",
    "pages": 1
  },
  {
    "url": "https://www.Whosebug_not-so-greatquestions.com",
    "pages": 3
  }
]

我想要完成的是打印与我这样做的页数相等的 url：

url_list = []
for x in json:
    for y in range(x['pages']):
        url_list.append(x['url'])

我快完成了，这是按照我的要求进行并打印出 url，但我还想根据页面的值对输出进行编号。

所以我的最终结果是这样的：

"https://www.Whosebug_greatquestions.com", 1,
"https://www.Whosebug_not-so-greatquestions.com", 1,
"https://www.Whosebug_not-so-greatquestions.com", 2,
"https://www.Whosebug_not-so-greatquestions.com", 3

我觉得枚举在这里很有用，但我似乎无法理解如何实现它。我所能做的就是对整个列表进行编号，正如您从上面看到的那样，这不是我想要完成的。

提前谢谢你，布莱恩

Answer 1

这是一种方法。没什么特别的，只是一个 for 循环和一个 range 依赖于 'pages' 键。

>>> data = [ 
...:   { 
...:     "url": "https://www.Whosebug_greatquestions.com", 
...:     "pages": 1 
...:   }, 
...:   { 
...:     "url": "https://www.Whosebug_not-so-greatquestions.com", 
...:     "pages": 3 
...:   } 
...: ]                                                                                                                        
>>>                                                                                                                           
>>> for d in data: 
...:     for i in range(1, d['pages'] + 1): 
...:         print(d['url'], i) 
...:                                                                                                                          
https://www.Whosebug_greatquestions.com 1
https://www.Whosebug_not-so-greatquestions.com 1
https://www.Whosebug_not-so-greatquestions.com 2
https://www.Whosebug_not-so-greatquestions.com 3

编辑 - 构建列表：

>>> result = [(d['url'], i) for d in data for i in range(1, d['pages'] + 1)]                                                  
>>> result                                                                                                                    
[('https://www.Whosebug_greatquestions.com', 1),
 ('https://www.Whosebug_not-so-greatquestions.com', 1),
 ('https://www.Whosebug_not-so-greatquestions.com', 2),
 ('https://www.Whosebug_not-so-greatquestions.com', 3)]

Answer 2

这会很好用：

url_list = []
for x in json:
    for y in range(x['pages']):
        url_list.append(x['url']+', '+str(y+1))
print(url_list)

输出

['https://www.Whosebug_greatquestions.com, 1', 'https://www.Whosebug_not-so-greatquestions.com, 1', 'https://www.Whosebug_not-so-greatquestions.com, 2', 'https://www.Whosebug_not-so-greatquestions.com, 3']

Python 枚举还是其他？

Python enumerating or something else?

python

json

list

dictionary

enumerate