First program

[Gabriel Genellina]

En Sat, 12 Jun 2010 06:03:43 -0300, Phil H <skilphil at gmail.co.za> escribió:

> Trying my hand with Python but have had a small hiccup.
> Reading  'A byte of Python' and created helloworld.py as directed.
>
> #!/usr/bin/python
> # filename : helloworld.py
> print 'Hello World'
>
> At the terminal prompt cd to the file location and run from the prompt.
>
> phil at grumpy:~/projects/python$ python helloworld.py
> Hello World
>
> All fine.
>
> Then I tried the following as described in the tutorial and get the
> following error
>
> phil at grumpy:~/projects/python$ chmod a+x helloworld.py
> phil at grumpy:~/projects/python$ ./helloworld.py
> bash: ./helloworld.py: /usr/bin/python^M: bad interpreter: No such file
> or directory
>
> The permissions are: rwxr-xr-x.

Looks like you created helloworld.py on Windows, or using Windows-oriented  
tools (perhaps a samba drive? ftp from a Windows disk?)
Windows text files end each line with the \r\n sequence (CR LF, bytes 0x0D  
0x0A, ^M^J). Unix (and Linux) uses only a \n (LF, 0x0A). The \r will be  
read as part of the previous line then.

There are tools to convert back and forth those formats (dos2unix and  
unix2dos, or the crlf.py demo script in the Python source distribution).  
But to avoid problems, it's better to use the right tools for the OS  
you're working with (that is, don't use notepad to edit Linux files...)

-- 
Gabriel Genellina