filter dataframe value in pandas Question: Hi I was trying to extract only the no’s from a columns in my df with this code: (df[‘hello’]==’No’) But it changes the values from the df and put it like a boolean values, I just want to value_count in that column the No’s, but I’m not sure what …
Select a subset of a dataframe based on conditions : category and note Question: I am trying to Select a subset of a dataframe where following conditions are satisfied: for same category keep only the row with highest note, if category=na keep the row Here’s my dataframe example : The expected result: What is the …
Filtering dataclass instances by unique attribute value Question: I have a list of dataclass instances in the form of: dataclass_list = [DataEntry(company="Microsoft", users=["Jane Doe", "John Doe"]), DataEntry(company="Google", users=["Bob Whoever"]), DataEntry(company="Microsoft", users=[])] Now I would like to filter that list and get only unique instances by a certain key (company in this case). The desired list: …
Return value if value in a column is found in another dataframe column pandas Question: I have two dfs. df1: Summary 0 This is a basket of red apples. 1 We found a bushel of fruit. They are red. 2 There is a peck of pears that taste sweet. 3 We have a box of …
How to remove repititve pattern from an image using FFT Question: I have image of skin colour with repetitive pattern (Horizontal White Lines) generated by a scanner that uses a line of sensors to perceive the photo. My Question is how to denoise the image effectively using FFT without affecting the quality of the image …
Python DataFrame Multi Line Filtering from Another Dataframe Question: I have a large data frame. Two of the columns has [‘radius’] and [‘angle’]. I have another filter data frame, which only has [‘radius’] and [‘angle’]. This code was meant to drop out rows that did not have both angle and radius matching from the filter …
python dictionary: How to get all keys with specific values Question: Is it possible to get all keys in a dictionary with values above a threshold? A dictionary could look like: mydict = {(0,1,2): "16", (2,3,4): "19"} The threshold could be 17 for example. Asked By: Varlor || Source Answers: Of course it is possible. …
Python Median Filter for 1D numpy array Question: I have a numpy.array with a dimension dim_array. I’m looking forward to obtain a median filter like scipy.signal.medfilt(data, window_len). This in fact doesn’t work with numpy.array may be because the dimension is (dim_array, 1) and not (dim_array, ). How to obtain such filter? Next, another question, how …
sqlalchemy dynamic filtering Question: I’m trying to implement dynamic filtering using SQLAlchemy ORM. I was looking through StackOverflow and found very similar question:SQLALchemy dynamic filter_by It’s useful for me, but not enough. So, here is some example of code, I’m trying to write: # engine – MySQL engine session_maker = sessionmaker(bind=engine) session = session_maker() # …
Truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all() Question: I want to filter my dataframe with an or condition to keep rows with a particular column’s values that are outside the range [-0.25, 0.25]. I tried: df = df[(df[‘col’] < -0.25) or (df[‘col’] > 0.25)] But I get the …
