On Tue, Nov 6, 2018 at 6:17 PM Joseph Gulizia <joseph.guli...@gmail.com> wrote:
>
> Apologies for earlier errors when asking for help -- I am hopeful that this
> shortened post displays properly:
> The code is Python 2... trying to solve why loop doesn't stop at given
> number of integers....if I input request for 3 integers....it keeps asking
> for integer1...and keeps asking for input,,,so count isn't
> working....trying to figure out why. Pointers please.
>
> import sys
>
> target_int=raw_input("How many integers?")
>
> try:
> target_int=int(target_int)
> except ValueError:
> sys.exit("You must enter an integer")
>
> # creates a collection (list) called ints
>
> ints=list()
>
> # keeps track of number of integers
>
> count=0
>
> # Keep asking for an integer until we have the required number
>
> while count<target_int:
> new_int=raw_input("Please enter integer{0}:".format(count+1))
> isint=False
> try:
> new_int=int(new_int)
> except:
> print("You must enter an integer")
> -----------------
>
>
> On Tue, Nov 6, 2018 at 3:50 PM Joseph Gulizia <joseph.guli...@gmail.com>
> wrote:
>
> > I'm using the bookazine "The Python Book" First Edition on pages 13-14 it
> > gives the code (listed further below).
> >
> > It asks for user to state a given number of integers (for example
> > 4)...then user enters integers. It doesn't stop seeking input after the
> > number requested thereby creating an infinite loop.
> >
> > -----------------------------
> > CODE
> > -----------------------------
> >
> > # Python Book Page_13.py
> > # Joe G.
> >
> > # several comment lines explain the code below it.
> > # Re-typing is good practice
> >
> > # We're going to write a program that will ask the user to input an
> > arbitrary
> > # number of intergers, store them in a collection, and then demonstrate
> > how the
> > # collection would be used in various control structures.
> >
> > # Used for the sys.exit function
> > import sys
> > # Requests number of intergers
> > target_int=raw_input("How many intergers?")
> > # By now, the variable target_int contains a string representtion of
> > # whatever the user typed. We need to try and convert that to an interger
> > but
> > # be ready to # deal with the error if it's not. Otherwise the program
> > will
> > # crash
> > # Begin the error check
> > try:
> > target_int=int(target_int)
> > except ValueError:
> > sys.exit("You must enter an interger")
> > # creates a collection (list) called ints
> > ints=list()
> > # keeps track of number of intergers
> > count=0
> > # Keep asking for an interger until we have the required number
> > while count<target_int:
> > new_int=raw_input("Please enter interger{0}:".format(count+1))
> > isint=False
> > try:
> > new_int=int(new_int)
> > except:
> > print("You must enter an interger")
> > # Only carry on if we have an interger. If not, we'll loop again
> > # Notice below I use == which is different from =. The single equals sign
> > is an
> > # assignment operator whereas the double equals sign is a comparison
> > operator. I would
> > # call it a married eguals sign....but whenever single is mentioned I have
> > to mention marriage.
> >
> > if isint==True:
> > # Add the interger to the collection
> > ints.append(new_int)
> > # Increment the count by 1
> > count+=1
> > # print statement ("using a for loop")
> > print("Using a for loop")
> > for value in ints:
> > print(str(value))
> > # Or with a while loop:
> > print("Using a while loop")
> > # We already have the total above, but knowing the len function is very
> > # useful.
> > total = len(ints)
> > count = 0
> > while count < total:
> > print(str(ints[count]))
> > count +=1
> >
> > count = 0
> > while count < total:
> > print(str(ints[count]))
> > count += 1
> >
> > -------------------------------
> > END OF CODE
> > -------------------------------
> > Sample output:
> >
> > How many integers?3
> > Please enter integer1:1
> > Please enter integer1:2
> > Please enter integer1:3
> > Please enter integer1:a
> > You must enter an integer
> > Please enter integer1:4
> > Please enter integer1:5
> > Please enter integer1:6
> > Please enter integer1:b
> > You must enter an integer
> > Please enter integer1:
> > (Keeps Looping)
> >
> > Thanks in advance
> > Joe
> >
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still not indented.. sorry.. figure that out
--
Joel Goldstick
http://joelgoldstick.com/blog
http://cc-baseballstats.info/stats/birthdays
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