Lecture 6

[winterthunder]

So, who thinks the other professor was better? I'm finding this guy harder to follow, though I did catch that computers can be wrong and paranoia is good.

Paranoia, paranoia everybody's coming to get me...

Er.

I have to say, I understand the whole lists, appending lists, concatenating lists idea, but I'm not following the code. For the universities bit, what are all the raw_inputs there for? Is the for loop just there to show that appending lists is messy? And which line is the concatenate? Is it "Univs = Techs + Ivys"?

(Class handout is here, and I've pasted the relevant code section under the cut.)


Techs = ['MIT', 'Cal Tech']
print Techs
Ivys = ['Harvard', 'Yale', 'Brown']
print Ivys
Univs = []
Univs.append(Techs)
print Univs
Univs.append(Ivys)
raw_input()
print Univs
raw_input()
for e in Univs:
> print e
> for c in e: print c
raw_input()
Univs = Techs + Ivys
print Univs
raw_input()
Ivys.remove('Harvard')
print Univs
Ivys[1] = -1
print Ivys

Comments

[jbanana]

Those raw_input() calls are just there to pause the output so that he could talk about what happened.

The for loop is to show what's in the outermost list: some more lists, which you can iterate over with a nested loop.

You're right about which line is the concatenation.

Hope you don't mind the drive-by comment. I saw this community and couldn't resist watching one of the lectures. I didn't learn much about computing (luckily - it's my job!) but I learned how to approximate a square root.

[winterthunder]

Oh, ok, so the raw_input isn't required for the code to function, he's just using it as a pause? I guess I didn't catch that the first time through.

And I don't mind drive-by comments at all, especially not when they're helpful! Welcome, and feel free to stick around. :)

[jbanana]

I've been having a go at the problem sets. It's quite good fun, particularly as I'd forgotten lots about python.

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[(Anonymous)]

Please feel free to moderate my cnmemot. My goal is to just the attention of the author. I don't intend to hurt anyone's feelings. Thanks. Btw I was not able to edit my cnmemot. Thought this would help.

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[(Anonymous)]

If you're reidnag this, you're all set, pardner!