How can I classify a string with a partial string and make a boolean column Question: Say I have the 1st dataframe with the following strings a abcd dabcd qwerty oppoupou Then I have a 2nd dataframe with the following substrings column abc qw qaz I’ve been looking for a code that can classify the …
What is the best way to return a boolean when a negative value exists in a list? Question: I have the following funciton telling us that a series has at least one negative value: def has_negative(series): v=False for i in range(len(series)): if series[i]<0: v=True break return v When we use this function on an example …
Why is the Boolean value of [None] True and the Boolean value of [] False? Question: I was working on a project and stumbled across this weird anomaly, apparently the Boolean value for any list or tuple with an None value is True Input print(bool([])) # empty list print(bool(())) # empty tuple print(bool([None])) # list …
plot multivariate function based on max Question: I would like to create a multivariate function that takes the max value of 2 functions and then to plot it. However by using the max function there is an error when applying the function on the meshgrid. I have tried this on other multivariate function without the …
In a panda dataframe how can I use boolean indexing on an index (in a multi-index dataframe)? Question: I have a data frame with four named indices, time, lev, lon, and lat, like this (this is just the head, it’s a huge dataframe): O N time lev lat lon 2021-01-01 4.055141e-10 -90.0 0.0 0.954735 0.046307 …
In Python, how to efficiently extract sublist from a list based on a list of 0/1, where locations with 1 is selected? Question: I have a list called all=[0, 1, 2, 3, 4, 5, 6, 7, 8, 9], and another list called sub=[1, 0, 1, 0, 1, 1, 0, 0, 0, 0], I want to …
How to change entire row/column to the same value in a matrix Question: So I have this 3d array x = np.zeros((9, 9)) Output: [[0 0 0 0 0 0 0 0 0] [0 0 0 0 0 0 0 0 0] [0 0 0 0 0 0 0 0 0] [0 0 0 0 …
How do I invert in Django the pretty "yes", "no" icons of a BooleanField in the Admin site? Question: When your model has a BooleanField, the Django Admin site displays circular icons: a green checkmark for "True" a red X for "False" The Django docs call those icons "pretty": If the field is a BooleanField, …
Series.Items() Method Returns Zip Instead of Expected Output (Pandas) Question: I am attempting to access the index of a series returned by the series.items() method in Pandas. I was able to successfully do so when the series I generated was the result of a groupby: df = pd.DataFrame( { ‘species’: [‘dog’, ‘cat’, ‘horse’, ‘dog’, ‘cat’, …
Short-circuiting with helper function in print() Question: Can someone please explain why the following code comes out as "geeks" in the console? def check(): return "geeks" print(0 or check() or 1) I’m assuming that Python recognizes the boolean operator, thus treating 0 == False? So does that mean every time boolean operators are used, the …
