Python：从多个词典列表中筛选空字符串

Question

我可以知道如何提出我的预期结果。我正在使用“if”陈述挣扎一个小时，但没有发生任何事情。

books = [{'title':'Angels and Demons'},{'title':''},{'title':'If'},{'title':'Eden'}] 
authors = [{'author':'Dan Brown'},{'author':'Veronica Roth'},{'author':''},{'author':'James Rollins'}] 

for i, book in enumerate(books): 
    print(book, authors[i]) 

---

expected result: 
({'title': 'Angels and Demons'}, {'author': 'Dan Brown'}) 
({'title': 'Eden'}, {'author': 'James Rollins'}) 

Answer 1

你想可能是排除一对标题或作者为空字符串什么。

books = [{'title':'Angels and Demons'},{'title':''},{'title':'If'},{'title':'Eden'}] 
authors = [{'author':'Dan Brown'},{'author':'Veronica Roth'},{'author':''},{'author':'James Rollins'}] 

for book, author in zip(books, authors): 
    if book["title"] and author["author"]: 
     print(book, author) 

# or 

[(book, author) for book, author in zip(books, authors) if book["title"] and author["author"]] 

Answer 2

books = [{'title':'Angels and Demons'},{'title':''},{'title':'If'},{'title':'Eden'}] 
authors = [{'author':'Dan Brown'},{'author':'Veronica Roth'},{'author':''},{'author':'James Rollins'}] 

for i, book in enumerate(books): 
    if book['title'] != '': 
     print(book, authors[i]) 

这应该工作

Answer 3

使用列表Comphersion

[(books[i],authors[i]) for i,v in enumerate(books) if books[i]['title'] and authors[i]['author']] 

输出：

您的问题

[({'title': 'Angels and Demons'}, {'author': 'Dan Brown'}), ({'title': 'Eden'}, {'author': 'James Rollins'})] 

Answer 4

一行代码

In [3]: [(book, author) for book, author in zip(books,authors) if book['title'] and author['author']] 
Out[3]: 
[({'title': 'Angels and Demons'}, {'author': 'Dan Brown'}), 
({'title': 'Eden'}, {'author': 'James Rollins'})]