What Is a 'Nonetype' Object

What is a 'NoneType' object?

NoneType is the type for the None object, which is an object that indicates no value. None is the return value of functions that "don't return anything". It is also a common default return value for functions that search for something and may or may not find it; for example, it's returned by re.search when the regex doesn't match, or dict.get when the key has no entry in the dict. You cannot add None to strings or other objects.

One of your variables is None, not a string. Maybe you forgot to return in one of your functions, or maybe the user didn't provide a command-line option and optparse gave you None for that option's value. When you try to add None to a string, you get that exception:

send_command(child, SNMPGROUPCMD + group + V3PRIVCMD)

One of group or SNMPGROUPCMD or V3PRIVCMD has None as its value.

Why do I get AttributeError: 'NoneType' object has no attribute 'something'?

NoneType means that instead of an instance of whatever Class or Object you think you're working with, you've actually got None. That usually means that an assignment or function call up above failed or returned an unexpected result.

How to test NoneType in python?

So how can I question a variable that is a NoneType?

Use is operator, like this

if variable is None:

Why this works?

Since None is the sole singleton object of NoneType in Python, we can use is operator to check if a variable has None in it or not.

Quoting from is docs,

The operators is and is not test for object identity: x is y is true if and only if x and y are the same object. x is not y yields the inverse truth value.

Since there can be only one instance of None, is would be the preferred way to check None.

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Hear it from the horse's mouth

Quoting Python's Coding Style Guidelines - PEP-008 (jointly defined by Guido himself),

Comparisons to singletons like None should always be done with is or is not, never the equality operators.

AttributeError: 'NoneType' object has no attribute 'get' - get.(href)

If you found all elements with find_all() then you don't need find() to search element again but you should use directly site.get().

Using site.find() you search nested <a> inside current <a> - and this is mistake.

It can't find nested <a> so find() gives None and this gives None.get() which gives error AttributeError: 'NoneType' object has no attribute 'get'

website = soup.find_all('a', {'class':'Lwqic Cj b'}) 

for site in website:
    url = site.get('href')
    print(url)

Method returns NoneType object

Use return in get_name method,

class User:
    def __init__(self, name):
        self.name = name

    def get_name(self):
        print(self.name)
        return self.name 

user = User("Mike")

What does 'AttributeError: 'NoneType' object has no attribute 'find_all'' mean in this code?

Check your selector for results attribute id should be resultsBody. The wrong selector causes the error in lines that uses results, cause None do not has attributes:

results = soup.find(id="resultsBody")

and also job_elements it is an td not a div:

job_elements = results.find_all("td", class_="resultContent")

You could also chain the selectors with css selectors:

job_elements = soup.select('#resultsBody td.resultContent')

Getting only these that contains Python:

job_elements = soup.select('#resultsBody td.resultContent:has(h2:-soup-contains("Python"))')

Example

import requests
from bs4 import BeautifulSoup

URL = "https://uk.indeed.com/jobs?q&l=Norwich%2C%20Norfolk&vjk=139a4549fe3cc48b"
page = requests.get(URL)

soup = BeautifulSoup(page.content, "html.parser")

results = soup.find(id="resultsBody")

job_elements = results.find_all("td", class_="resultContent")

python_jobs = results.find_all("h2", string="Python")

for job_element in job_elements:
    title_element = job_element.find("h2", class_="jobTitle")
    company_element = job_element.find("span", class_="companyName")
    location_element = job_element.find("div", class_="companyLocation")
    print(title_element)
    print(company_element)
    print(location_element)
    print()

AttributeError: 'NoneType' object has no attribute 'upper' when fetching Reddit darkmode

The getenv() function is returning a None value, probably because of not being able to find the variable or something likewise. You can also try to use a try-except block to resolve to an answer incase of a TypeError. Also, if this is the getenv from the os module then you can provide a default value as mentioned above.

The try block could be done as:

try:
    if getenv("THEME").upper() == "DARK":
            cookie_file = open('./video_creation/data/cookie.json')
            cookies = json.load(cookie_file)
            context.add_cookies(cookies)
except TypeError:
    # Do something if variable is not found or something like that
    smth_default()

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