Input and For loops Exercise

[tim]

Write a program that
1. Prompts the user for input of a string
2. Uses for loop to loop through each character of string and inserting each character to the beginning of a list which starts out as empty list (Note: a string can be viewed as a list of characters/letters).
3. Uses for loop to loop through each character of the inserted list and prints out each character/letter so that the input string from step 1. is now print out in reverse. (Note: to print multiple print statements without newline character between them, just pass in a 2nd named parameter of end="" which tells it to not end a line with newline character).

Solution:

Spoiler:

Code: Select all

s = input("Enter a string:")

l = []
#loop through each letter in string s and 
#keep inserting to beginning of list l
for letter in s:
    l.insert(0,letter)
    
#loop through each letter in l and printing it out
for letter in l:
    print (letter,end="")

[Krikor]

Tim,
I could not use For Loop.
I had trouble understanding what the problem was asking for.
Besides understanding the logic of the exercise, I also had to understand the text written in English.

I thought I would at some point apply the

Code: Select all

mylist.insert (index, item)

and add the characters in the empty list.
But I didn't know how to get the characters individually from the string provided by the user.

And with the example of the For Loops lesson, I was not able to apply this to a list.
For item in Mylist []: ??

Looking for For Loops, I found an example of how to use While loop, and I ended up understanding this function better.

Temporarily resolved (I think) using While.

But I still will not check the answer. I will continue trying to understand the For Loop, and then try again to solve this exercise.

For now this is my solution:

Spoiler:

Code: Select all

k=input("Enter your name"); print("")
x=(len(k)-1)
while x <= len(k) and x>=0: 
   print(k[x], end="")
   x-=1

Tim, thanks for the fun !!

[tim]

As long as you're able to come up with solution then I guess you've learned something.
While loops are fine as an alternative.

[Krikor]

As long as you're able to come up with solution then I guess you've learned something.
While loops are fine as an alternative.

If the question is simply to reach the final result ... yes, I learned a lot from this challenge.
But if the question is didactic, the ends do not justify the means.

I wasn't understanding the For Loops, and I think the exercise above all else is to better explore lesson theory.

I managed to come up with a result. I do not know if that is what was really requested.

It's time to see the Spoiler and find out the easiest way to do it!

Spoiler:

Code: Select all

words=input("Enter a text")

listt=[]
for word in words:
        listt.append(word)
print(listt)
print("*"*50)
listt.reverse()
print(listt)

Thx a lot Tim!

[tim]

I see you've found .reverse() on your own

[Krikor]

I see you've found .reverse() on your own

I wasn't able to reverse the initial string order, using For Loop.
As can be seen in the code below, the final inversion showed flaws.

Spoiler:

Code: Select all

words = ['0','1','2','3','4','5']
x=len(words)-1
listt=[]

for word in words:
    
    print(word, " tracking.word")
    
    listt.insert(x,word)
    
    print(x,word, " tracking.X.Word")
    print(listt, " tracking.list")
    x-=1

print(" ")    
print("*"*50)    

print(words, " Initial entry, no change")
print("*"*50)
    
print(listt, " Result, the order should have been reversed. But not.")   

I was using a counter to try to determine the input of the variable at a given position.

Then by chance, I discovered the .reverse (), and threw in the towel.

Then, when I checked the answer, I understood that the Index should be fixed at position 0 (zero), and that with the new entries, it would be pushed to the right.

Even though I failed the challenge using For Loops, I learned a lot on the way.

[tim]

as long as you learn and play around it's all good