Random String in Python

'''

Created on 2012-5-13

@author: cnp

'''

import string

import random

def random_string(size=6, chars=string.ascii_letters + string.digits):

    return ''.join(random.choice(chars) for x in xrange(size))

print random_string()

output:

bXwN6t

Hashing in Python

hashlib 裡面有md5 和sha可以使用

以下為範例

'''

Created on 2012-5-11

@author: cnp

'''

import hashlib

import hmac

x= hashlib.md5("MACA")

print x.hexdigest()

x= hashlib.sha256("udacity")

print x.hexdigest()

x= hmac.new("Secret", "HAHA").hexdigest()

print x

output:

19e165f571d62cbd06b97cc1413c86e2

6b63aae7ade6895dd8cd5b2621dccd546e278398

0224daa3a5efbaaa2414745183e20646

Python 筆記 namedtuple and sort with lambda expression

'''

Created on 2012-5-1

@author: Maca

'''

from collections import namedtuple

People = namedtuple("People",["Name","Age"])

Lists = [People("Maca","24"),People("Puma","18"),People("Lula","30")]

print Lists

Lists.sort(key=lambda args:args.Age)

print Lists

Lists.sort(key=lambda args:args.Name)

print Lists

Outputs:

[People(Name='Maca', Age='24'), People(Name='Puma', Age='18'), People(Name='Lula', Age='30')]

[People(Name='Puma', Age='18'), People(Name='Maca', Age='24'), People(Name='Lula', Age='30')]

[People(Name='Lula', Age='30'), People(Name='Maca', Age='24'), People(Name='Puma', Age='18')]

Python筆記 Set List Dictionary

集合 Set:

fruit = set(['apple','banana','tomato'])

vegetable = set (['carrot','tomato'])

print fruit | vegetable

print fruit - vegetable

print fruit & vegetable

print fruit ^ vegetable

set(['tomato', 'carrot', 'apple', 'banana'])

set(['apple', 'banana'])

set(['tomato'])

set(['carrot', 'apple', 'banana'])

List:

names = ['maca','Maca','Tony','Grace','Maca']

print names

print names.count('Maca')

names.sort()

print names

names.reverse()

print names

names.remove('Maca')

print names

['maca', 'Maca', 'Tony', 'Grace', 'Maca']

2

['Grace', 'Maca', 'Maca', 'Tony', 'maca']

['maca', 'Tony', 'Maca', 'Maca', 'Grace']

['maca', 'Tony', 'Maca', 'Grace']






Dictionary

di = {1:"HAHA",2:"LALA",3:"HOHO"}

print di[1]

di[1] = "MIMI"

print di[1]

di["A"] = "HEHE"

print di

print "-----------------------------------------------------"

print di.keys()

print di.values()

print "-----------------------------------------------------"

print di.pop("A")

print di

del di[2]

print di

HAHA

MIMI

{'A': 'HEHE', 1: 'MIMI', 2: 'LALA', 3: 'HOHO'}

-----------------------------------------------------

['A', 1, 2, 3]

['HEHE', 'MIMI', 'LALA', 'HOHO']

-----------------------------------------------------

HEHE

{1: 'MIMI', 2: 'LALA', 3: 'HOHO'}

{1: 'MIMI', 3: 'HOHO'}

Python 筆記 Regular Express in Python

參考:http://docs.python.org/library/re.html

判斷email格式

EMAIL_RE = re.compile(r"^[\S]+@[\S]+\.[\S]+$")

def valid_email(email):
    return EMAIL_RE.match(email)

沒找到的話
valid_email(xxx) ==None

Python 筆記- replace

'''

Created on 2012-5-1

@author: Maca

'''

str1 = "<<>>&&"

print str1.replace("<",">")

str2 = "abc"

for (a,b) in (("a","d"),("b","e"),("c","f")):

    str2 = str2.replace(a,b)

   

print str2

import cgi

str3 = ' <   >   &   " '

str3 = cgi.escape(str3,quote = True)

print str3

str3 = ' <   >   &   " '

str3 = cgi.escape(str3,quote = False)

print str3

>>>>&&

def

 &lt;   &gt;   &amp;   &quot; 

 &lt;   &gt;   &amp;   "