As far as I know, python list is a dynamic array. So when we reach a certain size, the capacity of that list will be increased automatically. But the problem is, unlike dynamic array of c or c++, even after increasing the capacity of list instance, the location is not being changed. Why is it happening? IR…
Tag: list
Adding multiple elements to dictionary inside the list and appending the dictionary every time and element is added
consider this is the list I want to add to the list of dictionaries below and every time I add the element I want the dictionary to create new dictionary within the list Exampel: I am new to python and not able to figure out how to do it. Thanks in advance Answer This should work: Output: Edit To address
How do I remove a common character from each element in my list?
I’m cleaning up my data after web scraping and the list has n before each element. SP500 = [‘nAAPL’, ‘nMSFT’, ‘nGOOG’, ‘nGOOGL’, ‘nAMZN’, ‘nTSLA’…] How should I go about removing the n from each element? Answer If you know it …
Finding average value in list of dictionaries based on another unique value
I have a list of dictionaries that have an “index” and a “weight” value. I want to average the dictionaries based on any unique index. So, with the below example, how can I find the average weight for any given index (e.g. 0, 1, 250, etc.)? There will be 8 total elements for each index…
Why does my slice do not change the values of the pointed dictionary in list but changes the values of all the dictionaries in my list?
I am trying to change only one out of three identical dictionary in my list using a for loop to slice out exactly the 2nd dictionary on my list. But somehow the values of all the 3 dictionaries in my list change as if i did not slice it correctly. What am I missing? Code: Actual Output: Expected Output: Answe…
Check same value in multiple lists [python]
I’ve 5 lists with some Infos saved in like: What i’d like do is check them and create a table like that’s: I’ve no worries to import a new library like pandas or others. I tried to use some nested For loop to check if there’s double values in each list and if was true, add it, bu…
Python add missing element into list
I have a list with day of a month as key and i want to add all missing day with 0 as value. This is a sample : And I looking for something like this : What is the better way to did it. This is my code : Answer You could simply make a run with numbers varying from
How do I compare two letters or values in two different lists?
I am making a program that has two lists (in Python), and each list contains 5 different letters. How do I make it so that any index number I choose for both lists gets compared and uppercase a letter if the condition is true? If the first two values in the list are the same (in my case a lowercase
How to optimise the grouping of values in lists by key in a dictionary list?
The script below works but I was wondering if there is a faster solution? With very large dictionary lists I noticed a small delay. Answer It seems keys in the dictionaries are the same, so you could use a dict comprehension: Another pretty fast alternative is to use the cytoolz module. Output: Timings:
Check for string in list items using list as reference
I want to replace items in a list based on another list as reference. Take this example lists stored inside a dictionary: Then, I have this list as reference: My result should look like this: I want to check if any of the list items inside “wishlist” is inside one of the values of the dict1. I tri…