Question

我是Python的新手。每当我使用Try时，就会出现NameError。没有异常处理时，它可以完美工作。

from urllib.request import urlopen
from bs4 import BeautifulSoup
from urllib.error import HTTPError


try:
    htm = urlopen('https://uiit.tech/placements/placements.pp')
except HTTPError as e:
    print(e)


bs = BeautifulSoup(htm, 'html.parser')
print(bs.h1)

输出错误

HTTP Error 404: Not Found
Traceback (most recent call last):line 12, in <module>
bs = BeautifulSoup(htm.read(), 'html.parser')
NameError: name 'htm' is not defined

Answer 1

尝试做：

except urllib.error.HTTPError as e:

    print(e)

Answer 2

您在

上犯了错误

htm = urlopen（'https://uiit.tech/placements/placements.pp'）

这应该是：

htm = urlopen（'https://uiit.tech/placements/placements.php'）

Answer 3

您想尝试在htm部分中使用try。当前，由于异常，它从未设置。

from urllib.request import urlopen
from bs4 import BeautifulSoup
from urllib.error import HTTPError

try:
    htm = urlopen('https://uiit.tech/placements/placements.pp')  
    bs = BeautifulSoup(htm, 'html.parser')
    print(bs.h1)
except HTTPError as e:
    print(e)

美丽汤中的NameError

3 个答案: