I am a beginner in the python world and I really like this language so far! In my exercices session I’ve found the following one: "Use a loop to display elements from a given list present at odd index positions" and I’ve come to 2 solutions. However I cannot see why the following 2 snippets… Read More Python list iteration not working with conditions?
I have a list of dataframes and want to use their indexes for my operations. import pandas as pd import numpy as np I0 = pd.DataFrame({‘Eng’: [11], ‘Fr’: [10], ‘It’: [9], ‘Sp’: [11], ‘Jp’: [12] }) I1 = pd.DataFrame({‘Eng’: [9], ‘Fr’: [4], ‘It’: [9], ‘Sp’: [11], ‘Jp’: [15] }) I = [I0, I1] When I… Read More Index of dataframes in a list
I need to multiply the contents of an array in Python with a For Loop, and its not working. Basically this is the code I need: g = [["flat"] in range(200)] I basically need 200 "flat"s stored in an array called g. Can anyone help? I expected it to store 200 ‘flat’s in the array… Read More How do I multiply the contents of an array with a for loop in Python?
As I learn Python I’m struggling in writing a loop to replace string in a list of list. Please see the following MWE, list=[[‘a’,’alpha’],[‘b’,’bravo’],[‘c’,’charlie’],[‘d’,’delta’]] for entry in list: name = entry[1] if name == ‘alpha’: name = name.replace(‘alpha’,’zulu’) if name == ‘bravo’: name = name.replace(‘bravo’,’zulu’) else: name = ‘xxx’ entry[1] = name print(list) I recognize… Read More Replace String in List of List
My list consists on several items: ["book","rule","eraser","clipboard","pencil",etc] Let say I have an element ["book"] and I want to match with another element ["rule"] with the same len (4). then I want to remove both elements from the list. ["eraser","clipboard","pencil",etc] I tried using a for loop and zip(lists, lists[1:]) but I can only remove the elements… Read More Match element then remove both elements
Okay, so my original problem was adding characters to a specific element in a list, but then I encountered the problem of my fix overwriting my entire list, leaving me with the edited element. My code listy = [‘item_1′,’item_2′,’item_3’] listy = [‘(‘+listy[1]+’)’] print(listy) >'(item_2)’ I understand why this is happening, I just don’t know how… Read More How to add characters to a specific element in a list without overwriting the entire list?
I have a large list made up of ten lists. I would like to remove lists that have zeroes in all the cells for a specific element. Here is my big_list: > dput(big_list) list(Zm00001eb000210_T001_1 = structure(list(uORF = c("Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1", "Zm00001eb000210_T001_1",… Read More How do I remove elements in a list based on values in each element?
I’m trying to understand what is the difference here? Is function range() better to be used here? Or why will we use range() if we cand do simply like (code #2) Code 1: a = [1, 2, 3, 4, 5] for elem in range(len(a)): print(elem) Code 2: a = [1, 2, 3, 4, 5] for… Read More Function range() in Python
con = np.array([[ 0, 0, 0, 0, 500, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 500, 0], [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [ 0, 1000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 500, 0, 0,… Read More How can I split list from matrix in python?
I am trying to change a list into a dataframe. Each element of the list may have an unequal length of values. An example list is given here: a = c(1:9) b = c(10:14) test_list = list(a, b) print(test_list) #> [[1]] #> [1] 1 2 3 4 5 6 7 8 9 #> #> [[2]]… Read More How to expand a list in R