Question

我正在学习使用python作为课程，所以我对这门语言很新。我正在进行一项练习，我一直遇到一个错误，我无法找到解决方案：

 File "get-weather-data.py", line 27, in <module>
    dayTemp = soup.findAll(attrs={"class":"wx-value"})[1].get_text()
IndexError: list index out of range

我更改了索引编号，似乎没有任何工作 - 我的代码是：

import urllib2
from bs4 import BeautifulSoup

#Create/open file called wunder.txt
f = open('wunder-data.txt', 'w')

#Iternate though months and day 
for m in range (1, 13):
    for d in range (1, 32):

#Check if already gone through month 
if (m == 2 and d > 28):
    break
elif (m in [4, 6, 9, 11] and d > 30):
    break

# Open wunderground.com url
timestamp = '2009' + str(m) + str(d)
print "Getting data for " + timestamp
url = "http://www.wunderground.com/history/airport/KBUF/2009/"
str(m) + "/" + str(d) + "/dailyhistory.html"
page = urllib2.urlopen(url)

# Get temperature from page
    soup = BeautifulSoup(page, "html.parser")
# dayTemp 
    dayTemp = soup.findAll(attrs={"class":"wx-value"}[1].get_text()

#Format month for timestamp
    if len(str(m)) < 2:
        mStamp = '0' + str(m)
    else:
        mStamp = str(m)

#Format day for timestamp
    if len(str(d)) < 2:
        dStamp = '0' +str(d)
    else:
        dStamp = str(d)

# Build Timestamp
    timestamp = '2009' + mStamp + dStamp 

#Write timestamp and temperature to file
    f.write(timestamp + ',' +dayTemp + '\n')

# Done 
f.Close()

Answer 1

您的问题在这一行：

soup.findAll(attrs={"class":"wx-value"}[1].get_text()

具体而言，{"class":"wx-value"}[1]。您不能指望列表总是带有超过1个项目，您永远不会知道您将获得多少项目。

相反，您应该查看从以下位置返回的输出：

soup.findAll(attrs={"class":"wx-value"}.get_text()

并弄清楚如何解析它。

Python错误：列表索引我们的范围，没有价值

1 个答案: