I have a large collection with fields like: I also have a Python dictionary mapping field values like: I’m trying to (in PyMongo) update my MongoDB collection so that a string field of mapped characters is accumulated, from both the top-level class field and the nested nested.classification fields. In t…
Tag: arrays
How to set a numpy array in a pandas data frame cell?
I have a pandas dataframe. I want to fill some of the cells with numpy array but I get the following ValueError. I wil not fill with zero array in real life. This is the simplified example code to replicate the error ValueError: could not broadcast input array from shape (10,) into shape (1,) Answer One worka…
Convert string array to array of array in python
I have input like this How to convert it into an array of array in Python like this? Answer Use str.split with map : If you want to convert each item to int:
Multiply by the factor the number of times that the position appears in the array (Python)
I’m trying to get a “pythonic” way or using a library (anything except “for” loops) for doing this. Expected result: However, I get: This doesn’t work for me as I need to multiply twice the factor (2) for the position 0 if, through the index, the 0 position repeats n amount…
How to define an array without defining its elements?
I want to optimize a problem in Python using scipy. To achieve this goal: I define an array of a certain length, but without defining its elements explicitly. Then, I need to use this array to optimize the problem. In the last step, I want to print this array as a result. Here is the simple example: Answer Py…
Python Check if Key/Value exists in JSON output
I have a JSON output and I want to create an IF statement so if it contains the value I am looking for the do something ELSE do something else. JSON Blob 1 JSON Blob 2 Desired Output but I cant seem to get it to trigger for me. I want it to search through the entire output and if
How find index where the item length less than x in python
for example i have a list which contain: For example, I want to get the index of the item that the length is less than 30. How to do that?Is it possible? Answer you can use enumerate function and list comprehention for this:
How to split some points in 3D based on some planes in python
In 3D space I have some points (x, y and z) and want to split them by reconstructing some exisiting planes. These are my simplified points: The big list has one sublist which has two arrays. I reality points has more subliststs and each sublist may also have several arrays. Then, In this simlified example I h…
Can I use numpy to replace values in an array, rather than generating a new array?
I feel like this can be easily accomplished. I have the following code: I might be wrong, but I think np.random.uniform() generates a whole new array, and then the my_array variable simply points to the new array, while the old array gets garbage collected. Since I’m positive that the new array will hav…
Is there a way to find the 0th index a variable amount of times?
I don’t really have a good reason for needing to know this, but is it possible to find the 0th index a certain amount of times? Say like you have this piece of code but instead of the 4 [0][0][0][0] you can just do like ar([0]*4). Anyway, thanks for the help. Answer What you want to do sounds weird beca…