【发布时间】:2021-05-15 16:25:17
【问题描述】:
我正在尝试从https://www.nseindia.com/ 自动提取股票价格数据。数据存储为 zip 文件,并且 zip 文件的 url 因日期而异。如果在某个特定日期股市休市,例如周末和节假日,则不会有文件/网址。
我想识别无效链接(不存在的链接)并跳到下一个链接。
这是一个有效的链接 -
path = 'https://archives.nseindia.com/content/historical/EQUITIES/2021/MAY/cm05MAY2021bhav.csv.zip'
这是一个无效链接 - (因为 5 月 1 日是周末,当天股市休市)
path2 = 'https://archives.nseindia.com/content/historical/EQUITIES/2021/MAY/cm01MAY2021bhav.csv.zip'
这就是我提取数据的方法
from urllib.request import urlopen
from io import BytesIO
from zipfile import ZipFile
import pandas as pd
import datetime
start_date = datetime.date(2021, 5, 3)
end_date = datetime.date(2021, 5, 7)
delta = datetime.timedelta(days=1)
final = pd.DataFrame()
while start_date <= end_date:
print(start_date)
day = start_date.strftime('%d')
month = start_date.strftime('%b').upper()
year = start_date.strftime('%Y')
start_date += delta
path = 'https://archives.nseindia.com/content/historical/EQUITIES/' + year + '/' + month + '/cm' + day + month + year + 'bhav.csv.zip'
file = 'cm' + day + month + year + 'bhav.csv'
try:
with urlopen(path) as f:
with BytesIO(f.read()) as b, ZipFile(b) as myzipfile:
foofile = myzipfile.open(file)
df = pd.read_csv(foofile)
final.append(df)
except:
print(file + 'not there')
如果路径无效,python 卡住了,我必须重新启动 Python。在循环多个日期时,我无法错误处理或识别无效链接。
到目前为止,我尝试区分有效链接和无效链接 -
# Attempt 1
import os
os.path.exists(path)
os.path.isfile(path)
os.path.isdir(path)
os.path.islink(path)
# output is False for both Path and Path2
# Attempt 2
import validators
validators.url(path)
# output is True for both Path and Path2
# Attempt 3
import requests
site_ping = requests.get(path)
site_ping.status_code < 400
# Output for Path is True, but Python crashes/gets stuck when I run requests.get(path2) and I have to restart everytime.
提前感谢您的帮助。
【问题讨论】:
-
在您的请求中添加timeout。
-
感谢您解决了问题
标签: python-3.x exception data-extraction