我需要能夠使用函式 (get_years) 來迭代評論串列，例如：
{'rating': 5.0,
'reviewer_name': 'Karen',
'product_id': 'B00004RFRV',
'review_title': 'Bialetti is the Best!',
'review_time': '11 12, 2017',
'images': ['https://images-na.ssl-images-amazon.com/images/I/81 XxFRGyBL._SY88.jpg'],
'styles': {'Size:': ' 12-Cup', 'Color:': ' Silver'}}```
{'rating': 3.0,
'reviewer_name': 'Peter DP',
'product_id': 'B00005OTXM',
'review_title': "Mr. Coffee DWX23 12-cup doesn't have the quality feel as my 13 year old nearly identical 12-cup Mr. Coffee",
'review_time': '04 17, 2015',
'images': ['https://images-na.ssl-images-amazon.com/images/I/71sFKwTW9sL._SY88.jpg'],
'styles': {'Style Name:': ' COFFEE MAKER ONLY'}}
{'rating': 5.0,
'reviewer_name': 'B. Laska',
'product_id': 'B00004RFRV',
'review_title': 'Love my Moka pots!',
'review_time': '07 9, 2015',
'images': ['https://images-na.ssl-images-amazon.com/images/I/719NCqw4GML._SY88.jpg'],
'styles': {'Size:': ' 1-Cup', 'Color:': ' Silver'}}
能夠回傳：
print(get_years(reviews)) # [2007, 2008, 2009, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018]
print(type(get_years(reviews))) # <class 'list'>
我有：
def get_years(review):
review_years_set = set()
for review in reviews:
review_years_set.add(review['review_time'][-4:])
review_years_list = list(review_years_set)
review_years_list.sort()
return review_years_list
這給了我我想要的東西，但它似乎是更長的路線。是否有更 Pythonic 或更有效的方法來獲取設定值的排序串列？
uj5u.com熱心網友回復：
給定一個可迭代的字串格式日期，例如：
dates = ['07 9, 2007', '04 1, 2008', '01 2, 2007', '08 2, 2014', '01 3, 2004', '01 4, 2004']
使用集合理解生成唯一年份排序串列的簡潔方法如下：
sorted_dates = sorted({int(date[-4:]) for date in dates})
print(sorted_dates)
輸出：
[2004, 2007, 2008, 2014]
uj5u.com熱心網友回復：
嘗試這個。
def get_years(reviews):
return sorted([review['review_time'][-4:] for review in reviews])
print(get_years(reviews))
轉載請註明出處，本文鏈接：https://www.uj5u.com/gongcheng/346443.html
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