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问题 You might have come across someplace where it is mentioned that it is faster to find elements in hashmap/dictionary/table than list/array. My question is WHY? (inference so far I made: Why should it be faster, as far I see, in both data structure, it has to travel throughout till it reaches the required element) 回答1: Let’s reason by analogy. Suppose you want to find a specific shirt to put on in the morning. I assume that, in doing so, you don’t have to look at literally every item of

问题 Suppose the path is "c:\users\test" , the folder "test" contains many files. i want to search for a file in test folder ,file name containing a word "postfix" in it in python script. Can anybody help me with it? 回答1: By listing all files inside folder: from os import listdir from os.path import isfile, join onlyfiles = [f for f in listdir(mypath) if isfile(join(mypath, f))] , and than asking each if substring in inside file string: for i in onlyfiles: if "postfix" in i: # do something 回答2:

问题 I am using react native and expo. I have some JSON data on the screen (iOS) simulator that was fetched from API. At the top, I have a search bar where users can search the data that is displayed on the screen. For example, if the data is A a company B bcompany A is a company symbol and a company is a symbol name. So when user types A it should display A company and if user type Z it should display Z company. My code: import React, { useState, useEffect } from "react"; import { StyleSheet,

问题 I am using react native and expo. I have some JSON data on the screen (iOS) simulator that was fetched from API. At the top, I have a search bar where users can search the data that is displayed on the screen. For example, if the data is A a company B bcompany A is a company symbol and a company is a symbol name. So when user types A it should display A company and if user type Z it should display Z company. My code: import React, { useState, useEffect } from "react"; import { StyleSheet,

问题 I am using react native and expo. I have some JSON data on the screen (iOS) simulator that was fetched from API. At the top, I have a search bar where users can search the data that is displayed on the screen. For example, if the data is A a company B bcompany A is a company symbol and a company is a symbol name. So when user types A it should display A company and if user type Z it should display Z company. My code: import React, { useState, useEffect } from "react"; import { StyleSheet,

问题 I'm working with Python, and I'm trying to find out if a word is in a text file. i am using this code but it always print the "word not found", i think there is some logical error in the condition, anyone please if you can correct this code: file = open("search.txt") print(file.read()) search_word = input("enter a word you want to search in file: ") if(search_word == file): print("word found") else: print("word not found") 回答1: Better you should become accustomed to using with when you open a

问题 I'm working with Python, and I'm trying to find out if a word is in a text file. i am using this code but it always print the "word not found", i think there is some logical error in the condition, anyone please if you can correct this code: file = open("search.txt") print(file.read()) search_word = input("enter a word you want to search in file: ") if(search_word == file): print("word found") else: print("word not found") 回答1: Better you should become accustomed to using with when you open a

问题 I'm trying to implement the Uniform-cost search in python and for that I need a priority queue, which I'm using queue.py from the standard library. However, the end of the algorithm checks if there is any path with higher cost in the queue. How can I check if there is any given value in my queue if it's not iterable? Thanks 回答1: queue.PriorityQueue is actually implemented using a list , and the put / get methods use heapq.heappush/heapq.heappop to maintain the priority ordering inside that

问题 I've got an accordion with section headers and individual items. I'm going to link to the element ID to scroll to the relevant section but want to use a search box to search for "section 1" etc. var acc = document.getElementByClassName("accordion"); var i; for (i = 0; i < acc.length; i++) { acc[i].addEventListener("click", function() { this.classList.toggle("active"); var panel = this.nextElementSibling; if (panel.style.maxHeight){ panel.style.maxHeight = null; } else { panel.style.maxHeight

问题 I need a binary search function. I couldn't find any function in the standard library that will return the index of the found item, and if it wasn't found, will return the bitwise complement of the index of the next element that is larger than the item I looked for. What is the function I am looking for? Edit: I need to insert an item to a sorted vector and to keep it sorted. That's why I need to bitwise complement index. 回答1: I'm quite certain the standard library doesn't include anything to