英文:
UnboundError: local variable 'item_url' referenced before assignment
问题
在另一个函数中，URL 是一个单独的变量，一切正常运行。
def afd(url):
url = '...'
...
links = [...]
async def ...(...):
items = [...]
result_id = ...
for i in range(5):
if result_id == items[i].id:
item_url = links[i]
break
afd(item_url)
我尝试了什么都没有，因为我在这里没有看到任何问题，也不知道如何修复它。一些互联网上的解决方案没有起作用。
英文:
In another function where URL is a separate variable everything works fine
def afd(url):
url = '...'
...
links = [...]
async def ...(...):
items = [...]
result_id = ...
for i in range(5):
if result_id = items[i].id:
item_url = links[i]
break
afd(item_url)
I tried nothing because I don't see any problems here and have no idea how to fix it. Some solutions from the internet didn't work
答案1
得分: 0
根据错误信息显示，您正在引用一个未分配的变量。
在这种情况下，只有在满足条件result_id = items[id].id时，才会分配item_url，但这是不可能的，因为您只是在评估一个赋值语句（例如 x = 10）而不是一个语句（例如 x == 10）。
即使在修复语句后，变量item_url也只会在item.id有效的情况下分配，您应该在item.id无效的情况下定义一个默认值（例如item_url = []，假设每个项目都有一个不同的URL），或者在if体内使用该变量。
选项1
def afd(url):
url = '...'
...
links = [...]
async def ...(...):
items = [...]
result_id = ...
items_url = [] // 默认值
for i in range(5):
if result_id == items[i].id: // 正确的比较语句
items_url[i] = links[i] // 添加有效的item_url
break
for item_url in items_url:
afd(item_url) // 对每个有效的item_url调用afd
这绝不是最佳实现，而只是基于您提供的代码片段的教育性尝试。
英文:
As the error says, you are referencing a variable that is not assigned.
In this case item_url only get assigned if the condition result_id = items[id].id is met, which it's impossible as you are just evaluating an assignment (e.g x = 10) and not a statement (eg x == 10).
And even after fixing the statement, the variable item_url only is assigned for cases in which the item.id is valid, you should define a default value (e.g item_url = [] assuming there is a different url for each item) in case the item.id is invalid or use the variable inside your if body.
Option 1
def afd(url):
url = '...'
...
links = [...]
async def ...(...):
items = [...]
result_id = ...
items_url = [] // default value
for i in range(5):
if result_id == items[i].id: // Correct comparison statement
items_url[i] = links[i] // Add valid item_url
break
for item_url in items_url:
afd(item_url) // Invoke afd over every valid item_url
This is by no means the best implementation but more an educational attempt based on your snippet of code.
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