I've been writing a lot of constructs like this the past couple of days: list = get_list() if list: for i in list: pass # do something with the list else: pass # do something if the list was em...

I have the following code snippet: user = User(username='[email protected]',email='[email protected]') user.set_password('pass') user.save() u = authenticate(username='[email protec...

I have a function with four parameters a, b, c and d as shown below. def myfunc(a=None,b=None,c=None,d=None): if <check which are not None>: myfunc2(<pass those which are not None>)...

I'd like to distinguish between None and empty strings ('') when going back and forth between Python data structure and csv representation using Python's csv module. My issue is that when I run: im...

I am getting an error message that says AttributeError: 'NoneType' object has no attribute 'something' How can I understand this message? What general scenarios might cause such an AttributeError,...

I have a df with two columns and I want to combine both columns ignoring the NaN values. The catch is that sometimes both columns have NaN values in which case I want the new column to also have Na...

Is there a way to accomplish the following in one call: Model.objects.get(id=1) else None The only way I've found a way to do this is by doing: try: object = Model... except: object = None ...

What does TypeError: 'NoneType' object is not iterable mean? Example: for row in data: # Gives TypeError! print(row)

I have a method that sometimes returns a NoneType value. So how can I question a variable that is a NoneType? I need to use if method, for example if not new: new = '#' I know that is the wrong...

from dataclasses import dataclass @dataclass class InventoryItem: """Class for keeping track of an item in inventory.""" name: str | None = None unit_price: ...

Any help on the following error? I'm running both PCA and t-SNE and PCA seems to run well, but wherever I run t-SNE, I run into the following error.My code for t-SNE is below: def T_SNE(X,Label,Com...

I have this piece of code which creates a new note. When I try to print, I get the following error even though it prints the output: Error: C:\Python27\Basics\OOP\formytesting>python notebook.py...

I'm trying to assign None to a key in a dict, but I'm getting a TypeError: self._rooms[g[0]] = None TypeError: 'NoneType' object does not support item assignment My code is here: r = open(filename...

Often when I try using BeautifulSoup to parse a web page, I get a None result from the BeautifulSoup function, or else an AttributeError is raised. Here are some self-contained (i.e., no internet a...

If your question was closed as a duplicate of this, it is because you have some code of the general form x = X() # later... x = x.y() # or: x.y().z() where X is some type that provides y and z met...

after execute : df =pd.pivot_table(data_frame, values='volume', index=['marque'], columns=['canaux_vn_argus','annee'], aggfunc=np.sum, fill_value=0) I have this Exception: 'NoneType' object is not ...

I am learning and playing around with Python and I came up with the following test code (please be aware that I would not write productive code like that, but when learning new languages I like to ...

I'm getting this error when I run my python script: TypeError: cannot concatenate 'str' and 'NoneType' objects I'm pretty sure the 'str' means string, but I dont know what a 'NoneType' object is...

I have table x: website 0 http://www.google.com/ 1 http://www.yahoo.com 2 None I want to replace python None with pandas NaN. I tried: x.replace(to_replace=None, value=np.nan) But I got: Ty...

I'm trying to count things that are not None, but I want False and numeric zeros to be accepted too. Reversed logic: I want to count everything except what it's been explicitly declared as None. E...

anyone can help? Here are my codes. df_ci = pd.DataFrame(df_ig.groupby(['Tanggal'])['INTERACTIONS IG'].sum()) df_ci It is what the dataframe looks like. INTERACTIONS IG Tanggal 2021-12-02 74.0 202...

My editor warns me when I compare my_var == None, but no warning when I use my_var is None. I did a test in the Python shell and determined both are valid syntax, but my editor seems to be saying...

I need a way to get a dictionary value if its key exists, or simply return None, if it does not. However, Python raises a KeyError exception if you search for a key that does not exist. I know that...

def foo( hello: str='world', bar: str=None, another_string_or_None: str|????=None): pass I'm trying to set a type hint in Python in a function, you can add more than one type hint with somethi...

What I am trying to do here is add the image to the button I have, then based on click or hover change the image. All the examples I have followed use the .config() method. For the life of ...