python学习---字典顺序问题

看到很多关于Python介绍的文章，说它功能很强大，代码写起来又简单。于是今天就打算学习了一下。在使用字典的时候有点小问题。

eg:
[gan@localhost py]$ cat my_dict.py
#!/usr/bin/python
# Filename: my_dict.py

vdict={
        "[e-mail]":"newworld",
        "[e-mail]":"second",
        "[e-mail]":"123456",
        "[e-mail]":"kown123"
       }

for email, pwd in vdict.items():
  print "Email: %s password: %s" %(email, pwd)

print "Done"

[gan@localhost py]$ my_dict.py
Email: [e-mail] password: newworld
Email: [e-mail] password: kown123
Email: [e-mail] password: 123456
Email: [e-mail] password: second
Done

看看怎么输出的顺序是这样的呢？和我输入的不是一样的阿？ 我也没搞清楚为什么是这样的，但我想按照我输入的顺序来输出怎么作呢？

想到元组了：
[gan@localhost py]$ cat my_dict.py
#!/usr/bin/python
# Filename: my_dict.py

vdict=(
        ("[e-mail]", "newworld"),
        ("[e-mail]" , "second"  ),
        ("[e-mail]"     , "123456"  ),
        ("[e-mail]"     , "kown123" )
       )

for i in range(0, len(vdict)):
  print "Email: %s password: %s" %(vdict[i][0], vdict[i][1])

print "Done"

[gan@localhost py]$ my_dict.py
Email: [e-mail] password: newworld
Email: [e-mail] password: second
Email: [e-mail] password: 123456
Email: [e-mail] password: kown123
Done

python用起来还不错，继续学习。是个很有趣的语言。还有好多问题不知道哦！

元组，列表，字典的区别：http://yangsq.javaeye.com/blog/128508