1小時學會python

1.一個簡單的web框架,flask

2.python版本,2.x版本仍是主流,有更多的第三方庫的支持,網上資料多;3.x的語法更優雅,與2.0不兼容

3.開發工具,好的開發工具,讓開發過程變得更愉快,推薦sublime ,pydev.pydev在eclipse下搭建。

4.第一個程序

print 'hello world!'
print "hello world!"
print 'hello %s!' %('world')

## python 的單引號和雙引號無區別,使用靈活,如print "it's a snake",無歧義,不需轉義,輸出it's a snake;print 'a"bitch" ' ,輸出a "bitch"

## %s 是格式通配符,可以理解爲佔位替代,%s格式化一個對象爲字符,%d的話,格式爲整數.等等...

5.流程控制——if

a = 1; b = 2
if(a == b) :
 print 'a == b'
elif (a > b) :
 print 'a > b'
elif (a < b) :
 print 'a < b'
else :
 print '#@)#$' 

6.流程控制——for each、while

array = [1,2,3,4]
total = 0
for a in array:
 total += a
print total

---------------
while 1 > 2:
 pass


## total+=a 相當於total=total+a ,pass爲佔位符

7.集合——set

print set( [1,2,3,4,4]) # 去重

set1 = set([1,2,3,4,5])
set2 = set([2,3,4,5,6])
print set1 - set2 # set1有,set2沒有
print set1 & set2 # set1和set2的交集
print set1 | set2 # set1和set2的並集

8.字典

# key value結構
dict={}
dict['zs'] = 21
dict['ls'] = 25
dict['ww'] = 22

for key in dict.keys():
 print '%s %d' %(key, dict[key])

9.方法

def main(): pass

if __name__ == '__main__': main()

##構造函數,Python的魔法方法

10.文件讀寫

f = file("c:/client_log.txt","r") 
print f.read()
f.close()
with open("c:/client_log.txt","r") as f:
 print f.read()
with open("c:/yy.txt","w") as f:
 f.write("i'am OK!")
##下面的代碼,可以在自己電腦上試一下,創建一個文件夾,文件夾中放入圖片.jpg或.png格式的;文本.txt,運行代碼,會自動生成一個index.html ,遍歷了文件夾中的文本和圖片並顯示在網頁上。
#html
import os,sys
html=open('index.html','w')
html.write("""
<html>
<head>
<title>Test</title>
<style>img{float:left;margin:5px;}</style>
</head>
<body>
""")
files=os.listdir('.')
for f in files:
    if f.lower().endswith('.txt'):
        fp=open(f)
        content=fp.read()
        fp.close()
        html.write("<p>%s</p>"%content)
for f in files:
    if f.lower().endswith('.jpg') or f.lower().endswith('.png'):
        html.write("<img src='%s'/>"%f)
html.write('</body></html>')
html.close()

11.網絡API (略)

12.第三方庫安裝

easy_install redis
    or
pip install redis (推薦) 

## redis 是key-value存儲系統. pip和easy_install是安裝命令,省時省力省心。比如我以前就不知道,我用的redhat的yum命令,windows下,就只會下一步下一步。注意有時有版本問題,要指定版本下載,如pip install redis==2.6.2

                                                                                                                                                                                                                                           

                                                                                                                                                                                                                                           本文內容基於月哥的分享.

                                                                                                                                                                                                                                            此致  敬禮

                                                                                                                                                                                                                                                                              

 

 

 

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