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 4 years ago
How would I write the definition for this
def shift(my_list):
"Shifts the list [x1,x2,...,xn] to [x2,x3,...,xn,x1]."
 4 years ago
How would I write the definition for this def shift(my_list): "Shifts the list [x1,x2,...,xn] to [x2,x3,...,xn,x1]."

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Onyx
 4 years ago
Best ResponseYou've already chosen the best response.0If you don't get what i am trying to do, i am defining a function that will shift the list to the right moving the first element to the end.

Aslander
 4 years ago
Best ResponseYou've already chosen the best response.0You can try this  it may not be pretty, but it works. I threw in print statements so you could see whats happening. def shifting(): a = [1,2,3,4] for i in range(5): print "Original List:", a b = a[1:] b.append(a[0]) print "Ammended List:", b print a = b

Aslander
 4 years ago
Best ResponseYou've already chosen the best response.0You could do it just once, or as many times as you wish, by changing the range(x).

Onyx
 4 years ago
Best ResponseYou've already chosen the best response.0thank you and i have one more question to ask which ocw course is better http://ocw.mit.edu/courses/electricalengineeringandcomputerscience/600introductiontocomputerscienceandprogrammingfall2008/index.htm or http://ocw.mit.edu/courses/electricalengineeringandcomputerscience/6189agentleintroductiontoprogrammingusingpythonjanuaryiap2010/

Onyx
 4 years ago
Best ResponseYou've already chosen the best response.0I am using the second one right now but it is a little confusing because there giving us problems they never taught like the one i asked you. So i was wondering if the one for this study board is better?

Aslander
 4 years ago
Best ResponseYou've already chosen the best response.0I don't know the other course...sorry.

Onyx
 4 years ago
Best ResponseYou've already chosen the best response.0Oh okay but have you had any problems with the course your using. Where the stuff asked for hasn't been taught or is it a good course?

Aslander
 4 years ago
Best ResponseYou've already chosen the best response.0It is a very good course so far. So far, everything matches up quite good. Of course you need to do extra reading for some things, but that is to be expected from a free online course. The teacherpupil aspect does not exist, so you need to be willing to work a little, and be autonomous.

Keen
 4 years ago
Best ResponseYou've already chosen the best response.0def shift(aList) aList.append(aList[0]) del aList[0] return aList

Keen
 4 years ago
Best ResponseYou've already chosen the best response.0:) I'm really warming to lists.

Onyx
 4 years ago
Best ResponseYou've already chosen the best response.0Thank You. I actually came up with the exact same script last night. I guess i was just cramming my brain too much because i took an hour break. Then I laid down and as I was laying down going to sleep i was like wouldn't it be easier to just take the first element and move to end using append then delete the first.

polpak
 4 years ago
Best ResponseYou've already chosen the best response.0A couple of things to consider.. Do you wish to modify the list in place, or return a new list constructed by shifting the old one. In general I would recommend the latter since it has fewer side effects. #does not modify def shift(thelist): return thelist[1:] + thelist[0] #modifies def inplace_shift(thelist): thelist.append(thelist.pop(0))

Aslander
 4 years ago
Best ResponseYou've already chosen the best response.0Oh that's nice polpak! I hadn't thought about how it would modify (or not) the list...I tried to break down Keen's function but found it really hard, now with your input I am thinking about how much I don't know about programming, :) and I think I will try simplifying my own work. Thanks!
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