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理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...ines of: 如果不用with语句，代码如下：
file = open("/tmp/foo.txt")
data = file.read()
file.close()
There are two annoying things here. First, you end up forgetting to close the file handler. The second is how to handle exceptions that may occur once the file handler has been obtaine...
Is there a quick way to delete a file from a Jar / war without having to extract the jar and recreat
...I was hoping there was something like "jar -d myjar.jar file_I_donot_need.txt"
3 Answers
...
OS X: equivalent of Linux's wget
...instance Ubuntu on an AWS instance, use:
wget http://example.com/textfile.txt
On a Mac, i.e. for local development, use this:
curl http://example.com/textfile.txt -o textfile.txt
The -o parameter is required on a Mac for output into a file instead of on screen. Specify a different target name ...
Core dumped, but core file is not in the current directory?
...
Read /usr/src/linux/Documentation/sysctl/kernel.txt.
[/proc/sys/kernel/]core_pattern is used to specify a core dumpfile pattern name.
If the first character of the pattern is a '|', the kernel will treat
the rest of the pattern as a command to run. The core dump will be...
淘宝应对双\"11\"的技术架构分析 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...“银河”而言，尽管所有的代码都掌握在我们手中，但要完整地将数据接收、实时计算、存储和查询等功能集成在一个分布式系统中，避免不了分层，最终仍然落到了目前的架构上。
为此，我们针对前端产品设计了专门的存储...
Java FileReader encoding issue
... void readAll( ) throws IOException{
String fileName = "College_Grade4.txt";
String charset = "UTF-8";
BufferedReader reader = new BufferedReader(
new InputStreamReader(
new FileInputStream(fileName), charset));
String line;
while ((line = reader.readLine()...
How to pass arguments to a Button command in Tkinter?
...global i, btn # btn can be omitted but not sure if should be
txt = ("Vicariously", "I", "live", "as", "the", "whole", "world", "dies")
btn['text'] = txt[i] # the global object that is modified
i = (i + 1) % len(txt) # another global object that gets modified
root = tk.Tk()...
How to call Android contacts list?
... implements OnClickListener {
private Button btn = null;
private TextView txt = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn = (Button) findViewById(R.id.button1);
txt = (TextView) findView...
How to duplicate sys.stdout to a log file?
...s.fdopen(sys.stdout.fileno(), 'w', 0)
tee = subprocess.Popen(["tee", "log.txt"], stdin=subprocess.PIPE)
os.dup2(tee.stdin.fileno(), sys.stdout.fileno())
os.dup2(tee.stdin.fileno(), sys.stderr.fileno())
print "\nstdout"
print >>sys.stderr, "stderr"
os.spawnve("P_WAIT", "/bin/ls", ["/bin/ls"],...
How to ignore certain files in Git
...
1) Create a .gitignore file. To do that, you just create a .txt file and change the extension as follows:
Then you have to change the name, writing the following line in a cmd window:
rename git.txt .gitignore
Where git.txt is the name of the file you've just created.
Then you...