On Mon, 17 Sep 2012 13:14:27 -0400, Philip Webb wrote about Re: [gentoo-user] new machine : suddenly Python 3 appears:
> In case others might like to use it, the script is : > > #!/usr/bin/python2 > from math import * > import sys > expression = sys.argv[1] > print ' ',eval(expression) The above line uses obsolete syntax. A big RTFM is required to get the new syntax, as print is no longer a statement, but a subroutine (or "void function" in C-speak). > Its help is via 'pydoc math'. Expressions need quotes if they have > brackets. > > It was failing with a syntax error in the print line, > when the 1st line read #!/usr/bin/python , > so I have to assume (1) that Python3 has been set as default > -- No ! I didn't do it ! -- & (2) its syntax for printing has changed. The latter -- and perhaps the former too, but that is irrelevant from a going-forward point of view. In fact, print changed a few years back, but Python 2,x tolerates the old syntax unless you specify the -3 run-time option. This option was also recommended a few years back, so that syntax that will be flagged by Python 3.x can be detected early (i.e. a few years back). So, try using #!/usr/bin/python2 -3 for your hash-bang line on all your old Python scripts. -- Regards, Dave [RLU #314465] *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* dwn...@ntlworld.com (David W Noon) *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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