First program
in [Python]
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From: Phil H on 12 Jun 2010 05:03 Hi, 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(a)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(a)grumpy:~/projects/python$ chmod a+x helloworld.py phil(a)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. Any help appreciated Phil
From: Peter Otten on 12 Jun 2010 05:16 Phil H wrote: > Hi, > 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(a)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(a)grumpy:~/projects/python$ chmod a+x helloworld.py > phil(a)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. > > Any help appreciated > Phil Did you write your script on a windows machine? Your line endings seem to be \r\n but you need \n. You can use dos2unix to fix the line endings: $ cat -v tmp.py #!/usr/bin/python^M print 'hello world'^M $ ./tmp.py bash: ./tmp.py: /usr/bin/python^M: bad interpreter: No such file or directory $ dos2unix tmp.py $ cat -v tmp.py #!/usr/bin/python print 'hello world' $ ./tmp.py hello world $ Peter
From: Chris Rebert on 12 Jun 2010 05:17 On Sat, Jun 12, 2010 at 2:03 AM, Phil H <skilphil(a)gmail.co.za> wrote: > Hi, > 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(a)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(a)grumpy:~/projects/python$ chmod a+x helloworld.py > phil(a)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. > > Any help appreciated Seems your file is using Windows line endings (CR+LF) rather than Unix line endings (just LF), which is messing up the processing of the shebang line. Run your file thru `dos2unix` (http://gd.tuwien.ac.at/linuxcommand.org/man_pages/dos2unix1.html ). Further info: http://en.wikipedia.org/wiki/Newline Also, a more generic shebang line is usually recommended: #!/usr/bin/env python Cheers, Chris -- http://blog.rebertia.com
From: Phil H on 12 Jun 2010 06:04 On Sat, 12 Jun 2010 09:03:43 +0000, Phil H wrote: > Hi, > Trying my hand with Python but have had a small hiccup. Reading 'A byte > of Python' and created helloworld.py as directed. ><snip> > Any help appreciated > Phil Thanks Peter & Chris for your prompt replies. The line ending was the problem. The script was written using Gedit on Ubuntu. Cannot find a setting in Gedit to set the line ending but it must be there somewhere so will keep looking. Also how do you see or check the line endings of a file? Thanks again Phil
From: Peter Otten on 12 Jun 2010 06:51
Phil H wrote: > On Sat, 12 Jun 2010 09:03:43 +0000, Phil H wrote: > >> Hi, >> Trying my hand with Python but have had a small hiccup. Reading 'A byte >> of Python' and created helloworld.py as directed. >><snip> >> Any help appreciated >> Phil > > Thanks Peter & Chris for your prompt replies. > The line ending was the problem. > The script was written using Gedit on Ubuntu. Strange. Did you perhaps start with a file that you got from elsewhere and modified that? Gedit may have left the CRs untouched then. > Cannot find a setting in Gedit to set the line ending but it must be > there somewhere so will keep looking. > Also how do you see or check the line endings of a file? cat -v filename is one option. CR (or "\r", or chr(13), or carriage return) shows up as ^M. The ^ means "subtract 64 from the byte value", e. g. ^M = chr(ord("M")-64) = chr(77-64) = chr(13) Peter |