第一次使用python1

 

抄了wxpython in action的代码.研究下怎么用.

在ubuntu 10.04上.

#!/bin/env python import wx class MyFrame(wx.Frame):     def __init__(self):         wx.Frame.__init__(self, None, -1, ”My Frame”, size=(300, 300))         panel = wx.Panel(self, -1)         panel.Bind(wx.EVT_MOTION,  self.OnMove)         wx.StaticText(panel, -1, ”Pos:”, pos=(10, 12))         self.posCtrl = wx.TextCtrl(panel, -1, ””, pos=(40, 10))         def OnMove(self, event):     pos = event.GetPosition()         self.posCtrl.SetValue(“%s, %s” % (pos.x, pos.y)) if __name__ == ’__main__’:     app = wx.PySimpleApp()     frame = MyFrame()     frame.Show(True)     app.MainLoop()  

root@ubuntu:/home/zhangbin/code/wxpy# vi bare.py

root@ubuntu:/home/zhangbin/code/wxpy# ls

bare.py

root@ubuntu:/home/zhangbin/code/wxpy# ./bare.py

bash: ./bare.py: Permission denied

root@ubuntu:/home/zhangbin/code/wxpy# chmod +x bare.py

root@ubuntu:/home/zhangbin/code/wxpy# ls

bare.py

root@ubuntu:/home/zhangbin/code/wxpy# ./bare.py

bash: ./bare.py: /bin/env python : bad interpreter: No such file or directory

root@ubuntu:/home/zhangbin/code/wxpy# python

Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) 

[GCC 4.4.3] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> 

KeyboardInterrupt

>>> ls

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

NameError: name 'ls' is not defined

>>> 

KeyboardInterrupt

>>> 

KeyboardInterrupt

>>> exit

Use exit() or Ctrl-D (i.e. EOF) to exit

>>> ls

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

NameError: name 'ls' is not defined

>>> dir

<built-in function dir>

>>> cd 

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

NameError: name 'cd' is not defined

>>> cd /

  File "<stdin>", line 1

    cd /

       ^

SyntaxError: invalid syntax

>>> ls

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

NameError: name 'ls' is not defined

>>> pwd

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

NameError: name 'pwd' is not defined

>>> python bare.py

  File "<stdin>", line 1

    python bare.py

              ^

SyntaxError: invalid syntax

>>> 

KeyboardInterrupt

>>> 

KeyboardInterrupt

>>> 

KeyboardInterrupt

>>> help

Type help() for interactive help, or help(object) for help about object.

>>> help(exit)

 

>>> 

>>> exit

Use exit() or Ctrl-D (i.e. EOF) to exit

>>> 

我用的ctrl+D才退出的python

改一下路径:# /usr/bin/python

root@ubuntu:/home/zhangbin/code/wxpy# ./bare.py

bash: ./bare.py: /usr/bin/python : bad interpreter: No such file or directory

查询py

root@ubuntu:/home/zhangbin/code/wxpy# ls /usr/bin  | grep 'py' 

bf_copy

bf_copy-bdb

couchpy

debconf-copydb

dh_pycentral

dh_pysupport

gvfs-copy

make-memtest86+-boot-floppy

mcopy

objcopy

pilconvert.py

pildriver.py

pilfile.py

pilfont.py

pilprint.py

py3_compilefiles

pycentral

pyclean

pycompile

py_compilefiles

pydoc

pydoc2.6

pygettext

pygettext2.6

pyhtmlizer

pyjj2fcitx

python  目录 

python2  目录 

python2.6

pyversions

ssh-copy-id

xdpyinfo

没有python这个可执行的文件.

root@ubuntu:/home/zhangbin/code/wxpy# bare.py

bare.py: command not found

再改#!python

root@ubuntu:/home/zhangbin/code/wxpy# ./bare.py

bash: ./bare.py: python : bad interpreter: No such file or directory

root@ubuntu:/home/zhangbin/code/wxpy# ls /usr/bin/env

/usr/bin/env  被我这么一弄,怎么变成可执行的了.

root@ubuntu:/home/zhangbin/code/wxpy# ls -al /usr/bin/env

-rwxr-xr-x 1 root root 30220 2010-09-21 11:33 /usr/bin/env

env还真是个可执行文件.

root@ubuntu:/home/zhangbin/code/wxpy# ./bare.py

  File "./bare.py", line 2

SyntaxError: Non-ASCII character '/xc2' in file ./bare.py on line 2, but no encoding declared; see http://www.python.org/peps/pep-0263.html for details

手动输入代码

root@ubuntu:/home/zhangbin/code/wxpy# vi bare.py

root@ubuntu:/home/zhangbin/code/wxpy# chmod +x bare.py

root@ubuntu:/home/zhangbin/code/wxpy# ./bare.py

  File "./bare.py", line 4

    defOnInit(self): #3

                   ^

SyntaxError: invalid syntax

愿意是def 后头应该有个空格.

root@ubuntu:/home/zhangbin/code/wxpy# ./bare.py

  File "./bare.py", line 5

    frame=wx.Frame(parent=None,title='bare')

        ^

IndentationError: expected an indented block

缩进错误，哪怕缩进一个空格也ok了。。。。囧～～～       root@ubuntu:/home/zhangbin/code/wxpy# ./bare.py   File "./bare.py", line 5     frame=wx.Frame(parent=None,title='bare')                                            ^ IndentationError: unindent does not match any outer indentation level 参考

http://topic.csdn.net/u/20080805/21/2647aeba-c85c-4df0-9576-413989a3a338.html

应该是缩进问题，特别是把几个不同的源码拷到一块修改调式的时候容易遇到，因为两个人写的程序缩进可能不一样，有的是tab，有的是空格，这用肉眼很难察觉。把缩进都改为一种格式就可以了。

空格的问题，按照你自己的方式进行缩进就行了，只是同一个语句块，你的缩进必须全部相同
否则会出错
也就是说那个语句快中，第一行语句的缩进是多少个字符，其他后面的就应该是多少个字符

缩进和编译器的选择,确实令人纠结啊.

root@ubuntu:/home/zhangbin/code/wxpy# which python

/usr/bin/python  这是个路径.

 

/usr/bin 下的python是个链接吧。可以链接到python2。6上去。