Python for Ruby programmers

Ruby
1

Hi,

I need to write a GUI for a vanilla RHEL3 box (with no extra software
installed on it). I figure Python / pygtk2 is a good choice for this,
as it’s installed by default. (Ruby is 1.6.8 on that box, and
ruby-gnome2 isn’t installed). The GUI will do various RPM-related
things – it’s a program that will examine a machine’s configuration
and figure out what additional RPMs need to be installed before a user
can run our software.

I don’t know much python, although I did write a small program in it a
few years ago. Any pointers on where I could get a quick introduction
to it? I don’t need an introduction to programming, I need an
introduction to Python (and preferably from a Rubyist POV).

Joe

2

On 3/3/06, Joe Van D. [email protected] wrote:

I don’t know much python, although I did write a small program in it a
few years ago. Any pointers on where I could get a quick introduction
to it? I don’t need an introduction to programming, I need an
introduction to Python (and preferably from a Rubyist POV).

What’s the Ruby equivalent of this?

for f in filter(lambda f: f(-1)>=f(1),
[lambda x:x, lambda x:x2, lambda x:x3]):
for x in range(-10, 11):
print x, f(x)

3

Joe Van D. wrote:

    print x, f(x)

-10.upto(10){ |n| puts “#{n} #{n**2}” }

:slight_smile:

Dan

4

On Mar 3, 2006, at 5:47 PM, Joe Van D. wrote:

user

for f in filter(lambda f: f(-1)>=f(1),
[lambda x:x, lambda x:x2, lambda x:x3]):
for x in range(-10, 11):
print x, f(x)

Well after struggling with mapping the results of the code to the
meaning I came up with this, which is pretty much a “word-for-word”
translation to ruby:

[ lambda { |x| x }, lambda { |x| x2 }, lambda { |x| x3 }].select
{ |f| f.call(-1) >= f.call(1) }.each do |f|
(-10…11).each do |x|
puts “#{x} #{f.call(x)}”
end
end