总结

以上是小编为你收集整理的php exec中的redirect在apache + windows7中被破解，正在使用windowsXP全部内容。

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Python删除windows垃圾文件的方法

本文实例讲述了Python删除windows垃圾文件的方法。分享给大家供大家参考。具体如下：

#coding:utf-8
import os
#from glob import glob
if os.name == 'nt':
 if 'HOMEPATH' in os.environ:
 home = os.environ['HOMEDRIVE'] + os.environ['HOMEPATH']
 else:
 home = os.environ['HOMEPATH']
workpath = os.path.join(home,'Local Settings')
#递归删除文件
#里面和下面的函数用try是抛出删除正在使用的零时文件出错
def delfile(path):
 for file in os.listdir(path): 
 if os.path.isfile(os.path.join(path,file)):
  try:
  print "\n删除垃圾文件： %s" % (os.path.join(path,file))
  os.remove(os.path.join(path,file))
  except:
  pass
 elif os.path.isdir(os.path.join(path,file)):
  delfile(os.path.join(path,file)) 
 else:
  pass
delfile(os.path.join(workpath,'Temp'))
delfile(os.path.join(workpath,'Temporary Internet Files'))
#删除文件家的时候必须为空文件夹，而且只能从最里层删起
def deldir(pa):
 for i in os.listdir(pa):
 if os.path.isdir(os.path.join(pa,i)):
  if len(os.listdir(os.path.join(pa,i))) > 0:
  deldir(os.path.join(pa,i))
  try:
   os.rmdir(os.path.join(pa,i))
  except:
   pass
  else:
  try:
   print "\n删除文件夹 %s" % (os.path.join(pa,i))
   os.rmdir(os.path.join(pa,i))
  except:
   pass
deldir(os.path.join(workpath,'Temp'))
deldir(os.path.join(workpath,'Temporary Internet Files'))
print """
 系统产生的零时垃圾文件清理完毕！
 """
raw_input("请按回车键退出！")

希望本文所述对大家的Python程序设计有所帮助。

Recursion and Tail Recursion in Java and Erlang

Typical Recursion Example (hanoi problem)

public void move(int n, String strFrom, String strTemp, String strTo) {
        if (n == 1) {
            show(1, strFrom, strTo);
        } else {
            move(n - 1, strFrom, strTo, strTemp);
            move(n - 1, strTemp, strFrom, strTo);
        }
    }

Then I come cross the term recursion and tail recursion in Erlang.

%% recursion
sum([H|T]) ->
    H + sum(T);
sum([]) ->
    0.

%% tail recurion
sum(X) ->
    sum(X, 0).
sum([H|T], Acc) ->
   sum(T, H + Acc);
sum([], Acc) ->
    Acc.

What is A Tail Call?

A tail call is a fancy term that refers to a situation in which a method or function call is the last instruction inside of another method or function.

Recursion Code with Java.

     /**
     * sum from 1 to n. recursion
     * @param i
     * @return sum 
     */
    public int recur_head(int i){
        if(i==1)
            return 1;
        else
            return i+recur_head(i-1);
    }

Tail Recursion Code with Java.

    /***
     * sum from 1 to n. tail recursion
     * @param i
     * @param total
     * @return
     */
    public int recur_tail(int i, int total){
        if (i == 1)
            return 1+total;
        return recur_tail(i-1, total +i);
        
    }

See the class with

 javap -c

public class Recur {
  public Recur();
    Code:
       0: aload_0
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: return

  public int recur_head(int);
    Code:
       0: iload_1
       1: iconst_1
       2: if_icmpne     7
       5: iconst_1
       6: ireturn
       7: iload_1
       8: aload_0
       9: iload_1
      10: iconst_1
      11: isub
      12: invokevirtual #2                  // Method recur_head:(I)I
      15: iadd
      16: ireturn

  public int recur_tail(int, int);
    Code:
       0: iload_1
       1: iconst_1
       2: if_icmpne     9
       5: iload_2
       6: iconst_1
       7: iadd
       8: ireturn
       9: aload_0
      10: iload_1
      11: iconst_1
      12: isub
      13: iload_2
      14: iload_1
      15: iadd
      16: invokevirtual #3                  // Method recur_tail:(II)I
      19: ireturn
}

for Java Developer

Java programmers tend to avoid recursion through the use of loops.

int factorial(int n) {
   int result = 1;
   for (int t=n; t > 1; t--)
       result *= t;
   return result;
 }

Reference

http://www.drdobbs.com/jvm/tail-call-optimization-and-java/240167044

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