我有初始代码:
books = []
def add_book():
name = input('Input the name of the book: ')
author = input('Input the author: ')
print('Book added successfully.')
books.append(
{
'name': name,
'author': author,
'read': False
}
)
我需要用户能够提供书名,如果他的输入与
books
中的名称匹配,则删除该书引用的整个字典。
我想出了这段代码:
def delete_book():
user_input = input('Input the name of the book to be deleted: ')
for book in books:
for key, value in book.items():
if book['name'] == user_input:
books.remove(book)
但是它不起作用..我浏览了大约2个小时来找到解决方案,作为初学者我无法弄清楚这一点,也许你们可以理清我的思路。
现在再看一下字典中的键值
read
。我希望用户能够将值更改为 True。所以我尝试了很多版本,但这更难。这就是我所拥有的:
def mark_read(): # TODO REVIEW !!!!
book_name = input('Input name of the book: ')
for book in books:
if book == book_name:
user_input = input('Mark book as read? (y/N): ')
if user_input == 'N' or 'n':
print('No changes were made')
elif user_input == 'Y' or 'y':
book.update(read=True)
else:
print('The specified book is not currently in our database.')
那么你能告诉我哪里错了,给我一个更好但菜鸟可读的选项吗?
删除代码:
def delete_book():
user_input = input('Input the name of the book to be deleted: ')
for i,book in enumerate(books):
if book['name'] == user_input:
del books[i]
标记为已读的代码:
def mark_read(): # TODO REVIEW !!!!
book_name = input('Input name of the book: ')
f=0 #flag to see if book is present in dict
for book in books:
if book['name'] == book_name:
f=1
user_input = input('Mark book as read? (y/N): ')
if user_input == 'N' or 'n':
print('No changes were made')
elif user_input == 'Y' or 'y':
book['read']=True
break #if book is found, you can exit the loop early
if f==0:
print('The specified book is not currently in our database.')
您的代码的问题在于,当您只需要一个字段时,您正在循环字典(
name
)。因此,您正在删除带有字典第一个字段的书,但您试图再次删除带有字典下一个字段的条目,这是不可能的。
您不需要迭代字典的所有字段来仅比较一个字段。以下作品:
books =[{'name': "Hello", "author": "Arthur"}, {'name': "Hi", "author": "Vicky"}]
user_input = input('Input the name of the book to be deleted: ')
for book in books:
if book['name'] == user_input:
books.remove(book)
print(books)
输入“Hi”时的结果:
[{'name': 'Hello', 'author': 'Arthur'}]
以上答案都不起作用,我尝试了所有解决方案,但是当我打印我的字典时,没有任何内容被删除,请提供一个代码,通过获取用户的输入从字典中删除项目。那会有帮助的。但是上面的答案对我在某些方面有帮助,谢谢