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Add exception handling code #105

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27 changes: 25 additions & 2 deletions v1/chapter3/3-crawlSite.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,6 @@
from urllib.request import urlopen
from urllib.error import HTTPError
from urllib.error import URLError
from bs4 import BeautifulSoup
import re
import datetime
Expand All @@ -7,6 +9,28 @@
pages = set()
random.seed(datetime.datetime.now())

def getBsObj(url):
try:
htmlCode = urlopen(url)
except HTTPError as e:
print(e)
except URLError as e:
print("!!The server couldn't be found!!")
print(e)
else:
pass

try:
bsObj = BeautifulSoup(htmlCode, 'html.parser')
except AttributeError as e:
print("!!tag not found!! --AttributeError")
print(e)
else:
if bsObj is None:
print("!!tag not found!! --None")
else:
return bsObj

#Retrieves a list of all Internal links found on a page
def getInternalLinks(bsObj, includeUrl):
internalLinks = []
Expand All @@ -33,8 +57,7 @@ def splitAddress(address):
return addressParts

def getRandomExternalLink(startingPage):
html = urlopen(startingPage)
bsObj = BeautifulSoup(html, "html.parser")
bsObj = getBsObj(startingPage)
externalLinks = getExternalLinks(bsObj, splitAddress(startingPage)[0])
if len(externalLinks) == 0:
internalLinks = getInternalLinks(startingPage)
Expand Down