CODEWITHSUNDEEP
pythonpython-3.xbeautifulsoup
Fabian Vagi
Fabian Vagi

Reputation: 15

Python: How to use the dict.get() function?

I'm a python beginner and im quiet stuck in a exercise. i'm using beautiful soup for parsing web pages. i have to update my link with the index position that i got u = tags[s]. i know that i must use a .get() that reads the variable that stores the html line which is (url). When i try to use url1 = u.get(url) and print. my result is None. So how i can use the .get() proporly?

import urllib.request, urllib.parse, urllib.error
from bs4 import BeautifulSoup
import ssl
# Ignore SSL certificate errors
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE

url = input('Enter - ')
s = input("Enter position: ")
m = input("Enter count: ")

s = int(s)
m = int(m)
while m > 0:
    html = urllib.request.urlopen(url).read()
    soup = BeautifulSoup(html, 'html.parser')
    tags = soup("a")
    m = m - 1
    #print(tags)
    u = tags[s]
    url1 = u.get(url)
    print(url1)

Upvotes: 1

Views: 333

Answers (1)

s3dev
s3dev

Reputation: 9721

Have a look at the Python docs for the dict type.

Regarding the .get() function it states (bold mine):

get(key[, default]) Return the value for key if key is in the dictionary, else default. If default is not given, it defaults to None, so that this method never raises a KeyError.

Example:

# Create a dict.
d = {'name': 'bob'}

# Index to the (non-existent) 'age' key.
d.get('age')
>>> None   # Not actually printed to the console. Added for demonstration.

# Index to the 'name' key.
d.get('name')
>>> 'bob'

# Index to the (non-existent) 'age' key, using a default value.
d.get('age', 'unknown')
>>> 'unknown'

Answer:

To answer your question, if None is returned from the .get() call, then the key being indexed does not exist. If a default value should be returned (to keep following code from falling over), pass a value into the optional default parameter.

Upvotes: 1

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