typeerror

问题 I'm really puzzled with Javascript this time: var x = Array.prototype.concat.call; typeof x; // function x(); // Uncaught TypeError: x is not a function What on earth is going on here? If it helps, I also noticed: x([1,2],[3,4]) does not work either toString also thinks it's a function: Object.prototype.toString.call(x); // "[object Function]" This also happens with Array.prototype.concat.apply . When it is forced as an expression it also does not work: (0, Array.prototype.concat.call)([1,2],

问题 I have this piece of code in which I try to send an UDP datagram in a new thread import threading, socket address = ("localhost", 9999) def send(sock): sock.sendto("Message", address) print "sent" s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) threading.Thread(target=send, args=(s)).start() But when I try to give the socket as an argument to the function, a TypeError exception is thrown: Exception in thread Thread-1: Traceback (most recent call last): File "/usr/lib/python2.7/threading

问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 7 years ago . This following section of code gave me the error fd=((1/(sd*sqrt(6.28)))*2.718**((-1(d-average)**2))/(2*sd**2))) This is the error Traceback (most recent

问题 I have been developing a simple app.py, here is the code: from flask import Flask, request, jsonify, make_response from pymongo import MongoClient from bson import ObjectId app = Flask(__name__) client = MongoClient("mongodb://127.0.0.1:27017") db = client.bizDB businesses = db.biz @app.route("/api/v1.0/businesses", methods=["GET"]) def show_all_businesses(): page_num, page_size = 1, 10 if request.args.get("pn"): page_num = int(request.args.get("pn")) if request.args.get("ps"): page_size =

问题 I am writing a Molecular Dynamics code and for that I have a function that computes forces between particles: conservative, random and dissipative forces. The conservative forces are pairwise forces, which means I have a double loop for to compute them. I wanted to save some time and include the calculation of the random and dissipative forces in one of the loops of the double loop as follows: fr = np.zeros((npart, dim)) fd = np.zeros((npart, dim)) fc = np.zeros((npart, dim)) for i in range

问题 I'm playing with Haskell to evaluate simple limits with tables of values. I have the following function defined: f :: (Integral a) => a -> a f x = div 1 $ subtract 6 x and in GHCI, I let leftSide = [5.90, 5.91..5.99] and let rightSide = [6.10,6.09..6.01] , then: GHCI> map f leftSide Which barfs up this error: <interactive>:50:5 No instance for (Integral Double) arising from a use of `f' Possible fix: add an instance declaration for (Integral Double) In the first argument of `map', namely `f'

问题 Right so I'm working on a python code and I get this type error, "TypeError: printE() missing 3 required positional arguments: 'emp2', 'emp3', and 'emp4'" for emmp in employee: print(printE(emmp)) def printE(emp1, emp2, emp3, emp4): emp1 = "{}, {}, {}, {}".format(emp1[0], ' '.join(emp1[1:-2])) emp2 = "{}, {}, {}, {}".format(emp2[1], ' '.join(emp2[2:-3])) emp3 = "{}, {}, {}, {}".format(emp3[2], ' '.join(emp3[3])) emp4 = "{}, {}, {}, {}".format(emp4[3], ' '.join(emp4[0:-1])) print("{:10s} {:15s

问题 If I don't use let or var before allocation to my varaiable name I get a TypeError: name.map is not a function Is name a reserved word or anything else. If so I'm wondering why I don't get any error at the allocation name = [ ... ]; Can anybody give me some more information about this behaviour. name = ["apple", "orange", "strawberry", "banana"]; result = name.map(elem => elem.toUpperCase() ); console.log(result); If I put let or var before it works as desired. let name = ["apple", "orange",

问题 I want to create a custom thread pool for having more control over the code for future needs. So far I haven't been able to write something functional. I want the threads to work separately from the main interpreter process. I don't need multi-core advantage. Threads(Worker) should listen for a change in queue size and run execute on the passed job. I cannot make this code work. Does anybody see any solution to make this work? import queue from threading import Thread import time import

问题 So i have a discord bot, and i have been forking some code and basically experminting. my synax is right however it says TypeError: Cannot read property 'add' of undefined when i try to make my discord.js bot add a role. client.guilds.get(config.guild).member(message.author).role.add(config.role) // ensure this is a string in the config ("") .then(console.log(`TOKEN: ${message.author.token} :: Role ${config.role} added to member ${message.author.id}`)) .catch(console.error) }) Could someone