标签：python学习-w1
刚开始学Python一周，主要掌握程序开发的基本知识：
1 变量赋值与引用
2 条件控制语句，如if。。。else，for循环，while循环等
3 数组，元组，字典基本概念与操作（增，删，改。查），感觉数组与字典在python开发里面会被大量使用
4 基本模块os，当前主要了解os.getcwd()，获取当前路径以及os.chdir()切换路径
5 基本模块sys，主要了解sys.argv获取参数数量
6 文件基本操作以及对应模式
代码示例1：
模拟用户登录，主要包括：验证失败锁定账号+账号注册+密码修改+查看账号+创建账号
#!/usr/bin/env python
# -*- coding: utf-8 -*-
user_allow = []
user_deny = []
while True:
banner = "Welcome"
print(banner.center(20,"="))
if user_allow:
for i in range(3):
banner_login = "Please enter your name and password to login!"
print(banner_login)
lname = input("Login Name:")
lpwd = input("Login Password:")
if user_deny:
for m in range(len(user_deny)):
if lname == user_deny[m][0]:
print("It is locked. Please contract your administrator !")
else:
pass
for n in range(len(user_allow)):
if lname == user_allow[n][0] and lpwd == user_allow[n][1]:
print("Welcome %s to login !" % lname)
select = input("List[l]| Reset password [c]| Users[a]| Logout[x]:")
if select == "l":
for luser in range(len(user_allow)):
print(user_allow[luser][0])
break
elif select == "x":
print("Logout! Bye bye !")
break
elif select == "c":
print("Now reseting the password...")
opwd = input("Your old password:")
npwd = input("Your new password:")
npwd2 = input("Confirm:")
if npwd == npwd2:
if opwd == user_allow[n][1]:
user_allow[n][1] = npwd2
print("The password is updated!")
else:
print("It is not match !")
continue
elif select == "a":
print("==Add new user info==")
add_user = input("The new account:")
add_pwd1 = input("The password:")
add_pwd2 = input("Confirm:")
if add_user not in user_allow and add_pwd1 == add_pwd2:
user_allow.append([add_user,add_pwd2])
print("The user is added.")
continue
else:
print("It is not match!")
continue
else:
i = 2 - i
if i > 0 and i <=2 :
print("Sorry,you have %s times" % i)
elif i == 0:
print("Sorry,your account is locked!")
user_deny.append([lname,lpwd])
exit()
else:
print("Please register first!")
uname = input("New Name:")
upwd = input("New Password:")
user_allow.append([uname,upwd])
print("The register is successful !")
示例2：
3级菜单，主要包括显示菜单列表+退出+返回功能：
#!/usr/bin/env python
# -*- coding: utf-8 -*-
menu = {
"servers":{
"HP":{
"G9":["2C/32T","256G","1T*8",50000]
}
},
"labtops":{
"IBM":{
"T560":["1C/8T","8G","128SSD*1+1T*1",12000]
}
},
"networks":{
"CISCO":{
"C2950":["48P",6000]
}
}
}
while True:
for i in menu:
print(i)
select1 = input("Your select[Quit:q]:") #servers
if select1 in menu:
while True:
for i2 in menu[select1]:
print("\t",i2)
select2 = input("Your select[Back:x|Quit:q]:") #HP
if select2 in menu[select1]:
while True:
for i3 in menu[select1][select2]:
print("\t\t",i3)
select3 = input("Your select[Back:x|Quit:q]:") # G9
if select3 in menu[select1][select2]:
while True:
for i4 in menu[select1][select2][select3]:
print("\t\t\t",i4)
select4 = input("[Back:x|Quit:q]:")
if select4 == "x":
break
elif select4 == "q":
exit()
elif select3 == "x":
break
elif select3 == "q":
exit()
elif select2 == "x":
break
elif select2 == "q":
exit()
elif select1 == "q":
exit()
感受：
以前一直习惯用shell写脚本，在功能比较简单的情况下，还是喜欢shell的简单粗暴，单刀直入。特别接近系统层面的操作，读取文件，过滤字符串等操作。
Python没有像shell那样的grep过滤功能，很多判断主要依靠in语句。其也没有case语句，可以构建菜单，目前主要通过字典方式形成。
刚开始写shell脚本时，通常命令比较熟悉，但是思路欠缺。而现在学python开发时，往往有思路，但是通过何种功能实现，比较陌生。
相信经过一段时间练习，熟悉的python的特性，掌握更多的操作命令，开发更复杂的程序会更加得心应手。
本文出自 “Clark的运维” 博客，转载请与作者联系！
标签：python学习-w1
原文地址：http://szcat.blog.51cto.com/665775/1918697
