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问题 As of python 3.3 the stdlib has the venv module for creating virtual environments. Are python 3.x venv environments relocatable? 回答1: Nope, commands installed in ./bin have fixed paths in shabang lines. 来源： https://stackoverflow.com/questions/27186207/are-python-3-x-venv-environments-relocatable

问题 My question: Should names of constant Java variables (within methods) be upper-case? I've always been under the impression that a) if a variable is never going to change, it should be declared final (to show/enforce that it won't change) b) it should be named in upper-case However, I've noticed in eclipse, when changing a variable (within a method) to be final/constant, and subsequently refactoring/renaming it to something like below: final int NODE_COUNT = 3; I get the following warning:

问题 I am unable to find in the C standard docs specifically where it says that multidimensional arrays are contiguous. While it can be inferred from the fact that array elements are contiguous, I want some perspective from the community. The following code prints out the numbers in the order that I would expect, which is 1 - 9. #include <stdio.h> int main() { int a[][3] = {{1,2,3},{4,5,6},{7,8,9}}; int* p = (int*)a; int i; for (i = 0; i < sizeof(a)/sizeof(int); i++) printf("%d ",p[i]); return 0;

问题 What is the big Oh notation for str.replace function in Python ? Is it always O(n) ? str = "this is string example" print str.replace("is", "was") thwas was string example 回答1: Big O notation is calculated at worst-case scenario, and Python sources for worst case do just 'find next position of substr, replace, and go further'. One replacement does O(n) operations (copying the string). One search, according to http://effbot.org/zone/stringlib.htm, in worst-case scenario does O(n*m) operations.

问题 request = requests.get("http://api.roblox.com/Marketplace/ProductInfo?assetId=1834225941").content print(str(request["Sales"])) this gives the following error: Traceback (most recent call last): File "C:\Users\yorks\Desktop\BloxUtility\bot.py", line 22, in <module> print(int(request["Sales"])) TypeError: byte indices must be integers or slices, not str Can you help me out? 回答1: This should work import requests import json request = requests.get("http://api.roblox.com/Marketplace/ProductInfo

问题 request = requests.get("http://api.roblox.com/Marketplace/ProductInfo?assetId=1834225941").content print(str(request["Sales"])) this gives the following error: Traceback (most recent call last): File "C:\Users\yorks\Desktop\BloxUtility\bot.py", line 22, in <module> print(int(request["Sales"])) TypeError: byte indices must be integers or slices, not str Can you help me out? 回答1: This should work import requests import json request = requests.get("http://api.roblox.com/Marketplace/ProductInfo

问题 I'm a beginner in assembly (using nasm). I'm learning assembly through a college course. I'm trying to understand the behavior of the sys_read linux system call when it's invoked. Specifically, sys_read stops when it reads a new line or line feed . According to what I've been taught, this is true. This online tutorial article also affirms the fact/claim. When sys_read detects a linefeed, control returns to the program and the users input is located at the memory address you passed in ECX. I

问题 I'm a beginner in assembly (using nasm). I'm learning assembly through a college course. I'm trying to understand the behavior of the sys_read linux system call when it's invoked. Specifically, sys_read stops when it reads a new line or line feed . According to what I've been taught, this is true. This online tutorial article also affirms the fact/claim. When sys_read detects a linefeed, control returns to the program and the users input is located at the memory address you passed in ECX. I

问题 I'm having a problem where trying to do a git push hangs up while "Writing objects". This is not the common scenario of Windows and git-daemon that I have seen answered elsewhere. This is Linux to Linux, using ssh. On both the client and server, git version is 1.7.8.6. I've tried doing the following: Create a local empty repo and push to that -- works fine Pull from local repo to local repo -- works fine Clone the remote repo to the local machine -- works fine git fsck and git gc on both

问题 I'm a beginner in assembly (using nasm). I'm learning assembly through a college course. I'm trying to understand the behavior of the sys_read linux system call when it's invoked. Specifically, sys_read stops when it reads a new line or line feed . According to what I've been taught, this is true. This online tutorial article also affirms the fact/claim. When sys_read detects a linefeed, control returns to the program and the users input is located at the memory address you passed in ECX. I