[Tutor] raw_input into range() function
Hello,
I am trying to do the exercises in Michael Dawson's "Absolute Beginner"
book. In chapter four ("for Loops, Strings, and Tuples") one of the
challenges is: "Write a program that counts for the user. Let the user
enter the starting number, the ending number, and the amount by which to
count."
The code I have come up with so far is further below; basically my
problem is that I don't know how to feed the range() function with the
user-input numbers it expects.
Your help is highly appreciated!
Guba
# Counting Program
# 2007-04-18
# Welcoming the player
print "Hello, let me do some counting for you!"
# Telling the player what to do & assigning that info to variables.
start_num = int(raw_input("Please give me a starting number. "))
end_num = int(raw_input("Please give me an ending number. "))
interval = int(raw_input("By which amount am I to count? "))
start_num == 0
end_num == 1
interval == 2
print "Counting:"
for i in range(0, 1, 2):
print i
raw_input("\n\nHit Enter to exit.")
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[Tutor] my first project: a multiplication trainer
Hello everybody, I want to create a simple multiplication trainer which quizzes me on the multiplication table. All multiplication combinations should be asked once, without repetition. Here my pseudo code: ### A = [1,2,3,4,5,6,7,8,9] B = [1,2,3,4,5,6,7,8,9] asked_questions = () false_answers = () #block 1 While tuple "asked_questions" contains less than 81 items: Take one random item from A and one random item from B If the question is NOT in "asked_questions": Add question to tuple "asked_questions" Calculate the question and wait for user-input print the question # e.g.: 3x6= If answer is false: add question to the tuple "false_answers" print: "You have answered all questions!" ### I would very much appreciate if you could comment on/criticise my pseudo code. In particular: is my approach correct, or would it be more sensible to first generate (or supply?) all possible questions and then select the ready questions randomly? So far I am not concerned about what to do with the tuple "false_answers". This I worry about later. Thanks for your help! Guba ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] my first project: a multiplication trainer
Hello! I like the idea of retaining my original questions by creating a proxy list, but I wasn't able to understand (find) the proxy list: Chris Fuller wrote: > from random import choice > questions = [ [i,j] for i in range(1,10) for j in range(1,10) ] > false_answers = [] > > choices = range(len(questions)) This I don't understand: len(questions) simply gives 81; range(len(questions)) counts them all up: 0,1,2...80. > > while choices: >proxyq = choice(choices) here choice(choices) picks ONE item out of choices (e.g. 56) and assigns it to proxyq >del choices[choices.index(proxyq)] here the item (56) just assigned to proxyq gets removed from choices (question: why not use pop() for these last two steps?) > >q = questions[proxyq] here q is assigned to item 56, i.e. [7, 3], out of questions (which contains all 81 possible questions). Now, because we are operating in a while loop, 81 item are generated and 81 items are accordingly picked out of the questions list, all this without repetition of items.. If I am right (am I?) with my interpretation, then I still don't understand how/where we generated a proxy list... I think we are just running a while loop without having generated a list out of its ouput!?? Cheers for a short comment! Guba ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] my first project: a multiplication trainer
Dear Chris, list,
cheers for the great help: very valuable indeed.
Chris Fuller wrote:
##
for proxyq in choices:
q = questions[proxyq]
answer = raw_input('%dx%d = ' % tuple(q))
if int(answer) == q[0]*q[1]:
print 'correct'
else:
print 'incorrect'
false_answers.append(q)
##
I was unable to find information on tuple(). (The Python help function
was rather conservative in its output, Google not helpful).
What exactly is the use of tuple(q) here, and why does not a simple q
instead of tuple(q) do? The latter would have been my intuitive
expectation...
The other thing I have on my mind is this: how could I have the program
ask the math questions not horizontally but vertically? An example:
4
x7
=
instead of
4x7=
Thank you all,
Guba
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[Tutor] question concerning Boolean operators
Dear list, from Guido's tutorial: It is possible to assign the result of a comparison or other Boolean expression to a variable. For example, >>> string1, string2, string3 = '', 'Trondheim', 'Hammer Dance' >>> non_null = string1 or string2 or string3 >>> non_null 'Trondheim' How does this work?? How does Python know that we are looking for non_null? After all, we don't provide this information here, right? (I take non_null is a variable.) I must be missing something... Can anyone help? Many thanks, Guba ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Newbie question concerning text covering multiple lines
Hello, I recently started teaching myself Python with Michael Dawson's 'Python Programming for the Absolute Beginner'. My problem is that I am running Python 2.5 under Linux while the book is based on Python 2.2.3. Apparently this means that I cannot just follow the programming examples the author gives. While I like the book and intent to continue using it, I was wondering which online resources I should consult in order to bridge the gap. So far I am stuck with the Python Tutorial at http://docs.python.org/tut/ which, however, doesn't care too precisely to my needs. Would you happen to have any suggestions for me? Many thanks, Guba ___ Der frühe Vogel fängt den Wurm. Hier gelangen Sie zum neuen Yahoo! Mail: http://mail.yahoo.de ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
