小编Opa*_*pal的帖子

我正在尝试遵循Flask安装网站上的说明,但在使用"sudo easy_install virtualenv"安装虚拟环境后,我遇到了错误.不确定

Opals-MacBook-Pro:~ opalkale$ mkdir myproject
Opals-MacBook-Pro:~ opalkale$ cd myproject
Opals-MacBook-Pro:myproject opalkale$ virtualenv venv
New python executable in venv/bin/python
Installing setuptools, pip...
  Complete output from command /Users/opalkale/myproject/venv/bin/python -c "import sys, pip; pip...ll\"] + sys.argv[1:])" setuptools pip:
  Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Library/Python/2.7/site-packages/virtualenv-1.11-py2.7.egg/virtualenv_support/pip-1.5-py2.py3-none-any.whl/pip/__init__.py", line 9, in <module>
  File "/Library/Python/2.7/site-packages/virtualenv-1.11-py2.7.egg/virtualenv_support/pip-1.5-py2.py3-none-any.whl/pip/log.py", line 8, in <module>
  File "/Library/Python/2.7/site-packages/virtualenv-1.11-py2.7.egg/virtualenv_support/setuptools-2.0.2-py2.py3-none-any.whl/pkg_resources.py", line 2696, in <module>
  File "/Library/Python/2.7/site-packages/virtualenv-1.11-py2.7.egg/virtualenv_support/setuptools-2.0.2-py2.py3-none-any.whl/pkg_resources.py", line 429, in __init__
  File "/Library/Python/2.7/site-packages/virtualenv-1.11-py2.7.egg/virtualenv_support/setuptools-2.0.2-py2.py3-none-any.whl/pkg_resources.py", line 443, in add_entry
  File "/Library/Python/2.7/site-packages/virtualenv-1.11-py2.7.egg/virtualenv_support/setuptools-2.0.2-py2.py3-none-any.whl/pkg_resources.py", …

我有一些关于反转空终止C字符串的概念性问题,以及关于指针性质的澄清问题.

输入可能是

char arr[] = "opal";

和代码:

void reverse(char *str) {  /* does *str = opal or does *str = o since the pointer str is type char? */

    char* end  = str; /* what is the difference between char* end and char *end? and is *end pointing to opal now? */

    char tmp;

    if (str) {  /* if str isn't null? */
        while (*end) 
            ++end; 
    }
    --end; /* end pointer points to l now */

    while (str < end) …

我对Gayl Laakmann McDowell第5版Cracking The Code Interview一书中的编程问题提出了疑问.

我不确定我的答案有什么问题？它与书中给出的答案有很大不同.

public String replace(String str){

   String[] words = str.split(" ");
   StringBuffer sentence = new StringBuffer();

   for(String w: words){
      sentence.append("%20");
      sentence.append(w);
   }

  return sentence.toString();
}

当我在命令行中输入python hello.py时,我得到另一个bash提示符.我不确定是什么问题,因为我能够运行virtualenv,当我检查哪个版本的烧瓶我有最新版本,>>> '0.10.1'安装.

Opals-MacBook-Pro:~ opalkale$ cd myproject
Opals-MacBook-Pro:myproject opalkale$ ls
hello.py    venv
Opals-MacBook-Pro:myproject opalkale$ . venv/bin/activate
(venv)Opals-MacBook-Pro:myproject opalkale$ python hello.py
(venv)Opals-MacBook-Pro:myproject opalkale$ 

hello.py的代码如下所示:

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello World!"

    if __name__ == "__main__":
            app.run()

此代码取自:http://flask.pocoo.org/docs/quickstart/#quickstart

什么更有效,为什么？

具体地_mm_loadu_si128与_mm_load_si128在C.

(编者注:或者这是标记的程序集,可能它们意味着movdqu与movdqa手写的asm.这是不一样的,特别是没有AVX,因为_mm_load_si128可以编译成ALU指令的内存操作数而根本没有单独movdqa的.)