Here’s a very basic solution: list = [‘BHX’, ‘AR’, ‘DEFab’, ‘ABR’, ‘DEFyr’, ‘HYt’, ‘wqw’, ‘DEF-a’] merged_list = [] current=”” for s in list: if s.startswith(‘DEF’): merged_list.append(current + ‘ ‘ + s) current=”” else: current += s 1 solved Merging elements in a list until certain text appears
The pivot_table function in pandas should do what you want. For instance: import pandas as pd frame = pd.read_csv(‘myfile.csv’, header=None) frame.columns = [‘user_id’, ‘date’, ‘event_type’] frame_pivoted = frame.pivot_table( index=’user_id’, columns=”event_type”, aggfunc=”count” ) In general, using vectorized Pandas functions is much faster than for loops, although I haven’t compared the performance in your specific case. 0 … Read more
There is not one single algorithm for extraction based summarization. There are several different algorithms to choose from. You should choose one that fits your specific needs. There are two approaches to extraction based summarization: Supervised learning – you give the program lots of examples of documents together with their keywords. The program learns what … Read more
You are using Python 2 and the book author is using Python 3. In Python 2 input tries to evaluate the entered value, so the string ’21’ actually becomes 21 as an int. As @Siddharth pointed out in the comments, str > int will always evaluate to True in Python 2. In Python 3 it … Read more
for i in range(0,5): password = str(input(“Enter password: “)) password_checker_result = password_checker(password) if not password_checker_result: print(“Invalid password”) else: print(“Valid password”) break This code will work for you, now let me explain: The flow is as following: This is done 5 times (is inside the for loop): 1) Request password from user. 2) Check if password … Read more
To scrape all the pages, observe that trailing parameter in the url increments by 2, rather than 1. Thus, the code below finds the maximum page in the listing, multiples the latter result by 2, and utilizes the result as a range: import requests, re, contextlib from bs4 import BeautifulSoup as soup import csv @contextlib.contextmanager … Read more
It could be as simple as from csv import reader from random import choice with open(myfile, newline=””) as in_f: rd = csv.reader(in_f) choices = [choice(row) for row in rd] (no need to make individual lists) 2 solved Write each individual row of a csv as a separate list (python)
Clearly, O(n) time-complexity, as i iterates from 0 to n-1. solved What is the running time of this algorithm? [closed]
You can use a property: class SomeClass(object): @property def x(self): return x 4 solved Automatic Redefining a global variable in the class
import csv from pandas import read_csv filename=”Left.csv” data = read_csv(filename) print(data.shape) #renaming existing columns data.rename(columns={‘epoc (ms)’: ‘epoc’, ‘timestamp (-04:00)’: ‘timestamp’, ‘elapsed (s)’: ‘elapsed’ , ‘x-axis (g)’: ‘xaxis’, ‘y-axis (g)’ : ‘yaxis’ , ‘z-axis (g)’ : ‘zaxis’}, inplace=True) from matplotlib import pyplot data.hist() data.plot(kind=’density’, subplots=True, layout=(3,3), sharex=False) from pandas.plotting import scatter_matrix scatter_matrix(data) pyplot.show() X = dataset[: … Read more
I think you are going overkill on this and over complicating your task. First pass your list to test1, then you pass that result into test2 and take 2 choice‘s from that value and return them, both functions only need to receive one argument from random import choice def test1(x): return x def test2(x): a … Read more
From the exception it seems that you have tried to call my_wallet.checkBalance passing self as parameter. Try to do my_wallet.checkBalance() instead of my_wallet.checkBalance(self) self parameter is passed automatically to class methods in python 11 solved Don’t understand this “NameError: name ‘self’ is not defined” error [closed]
try using a str.split and add another str so you can index each row. data = [{‘ID’ : ‘1’, ‘URL’: ‘https://ckd.pdc.com/pdc/73ba5189-94fd-44aa-88d3-6b36aaa69b02/DDA1610095.zip’}] df = pd.DataFrame(data) print(df) ID URL 0 1 https://ckd.pdc.com/pdc/73ba5189-94fd-44aa-88d… #Get the file name and replace zip (probably a more elegant way to do this) df[‘Zest’] = df.URL.str.split(“https://stackoverflow.com/”).str[-1].str.replace(‘.zip’,”) #assign the type into the next column. … Read more
Using map + lambda: xList=[‘abc’,’zxc’,’qwe’] yList=[1,2,3] print(list(map(lambda x,y: x+str(y),xList,yList))) Output: [‘abc1’, ‘zxc2’, ‘qwe3’] 0 solved Merge all items in a list [duplicate]
You cannot convert an integer bitpattern to a float by means of a cast. That just converts the integer to the nearest floating-point number, it does not re-interpret the bits as being a float. If it worked like you think, this: const float x = 512; would set x to 7.175E-43, which would not be … Read more