🔒 Simple loop (while)

[rugged lagoon]

Hi! Need help with this exercise:

Part 1

Please write a program which keeps asking the user for words. If the user types in end, the program should print out the story the words formed, and finish.
Sample output

Please type in a word: Once
Please type in a word: upon
Please type in a word: a
Please type in a word: time
Please type in a word: there
Please type in a word: was
Please type in a word: a
Please type in a word: girl
Please type in a word: end
Once upon a time there was a girl
Part 2

Change the program so that the loop ends also if the user types in the same word twice.
Sample output

Please type in a word: It
Please type in a word: was
Please type in a word: a
Please type in a word: dark
Please type in a word: and
Please type in a word: stormy
Please type in a word: night
Please type in a word: night
It was a dark and stormy night

My code:

# Write your solution here

sentence = ""
previous_word = ""

while True:
    word = str(input("Please type in a word: "))
    if word == "end":
        break
    sentence += word + " "
    previous_word = word
    if previous_word == sentence:
        break
    
    print(sentence)
    print(previous_word)
print(sentence)

I'm able to create a function for saving inputs to variable as well as a variable that only saves last input. I'm however not able to create a function for comparing last input to previous inputs and if matching break the loop.. How can I go about this?

[subtle wadi]

@rugged lagoon

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[south palm]

have you worked with a list before?

[balmy anvil]

Also, do you know if order matters? A word twice in a row, or would you break if the same word has been entered twice?

@rugged lagoon

[rugged lagoon]

Only if its been entered twice, but if it's twice in a row it should still break since that's repeating an input

[rugged lagoon]

No not yet

[balmy anvil]

You will need some way of storing the inputs you get (all of them)

The easiest way to do that would be to use something like a list

[south palm]

a list can be used to store a collections from some objects

[rugged lagoon]

Yes I've created the sentence and previous_words variables for storing the inputs

Yes I understand that but the constraint here is not to use a list, only conditional statements and while loops

[balmy anvil]

You can also create a string, it's essentially the same thing

[rugged lagoon]

How?

[south palm]

ah, using a list makes it so much more cleaner 😛

@balmy anvil can you go on, you're explaining the other way

[rugged lagoon]

I believe my code is correct but the ordering of the logic is wrong

[balmy anvil]

For each time you get the input, do something like

previous_words += word

In order to check if the current word is already in that list, you will have to make an if statement. Something like this could do:

if word in previous_words:
    break

As you are using strings, this would however fail at certain conditions. Example where a new word is a sub word of another word.

[rugged lagoon]

thanks, its working better now

# Write your solution here

sentence = ""
previous_word = ""

while True:
    word = str(input("Please type in a word: "))
    if word == "end":
        break
    
    if word in previous_word:
        break
    sentence += word + " "
    previous_word += word
print(sentence)

The problem now is it is reaching some sort of word limit

[subtle wadi]

Hey @rugged lagoon!

It looks like you pasted Python code without syntax highlighting.

Please use syntax highlighting to improve the legibility of your code and make it easier for us to help you.

To do this, use the following method:
```py
print('Hello, world!')
```

This will result in the following:

print('Hello, world!')```
You can **edit your original message** to correct your code block.

[balmy anvil]

You could completely avoid that by using a list:

# create list
previous_words = []

# add to list
previous_words.append(word)

# comparison
if word in previous_words:
    break

[rugged lagoon]

Once upon a time there was a girl > maxes out at "Once upon a time there was"

[rugged lagoon]

Understand, we cant use list rn though

Why is the variable reaching a word limit?

[balmy anvil]

This is for homework, correct?

[rugged lagoon]

yes

[south palm]

previous_word = word
not += word

[rugged lagoon]

im doing the MOOC Python couse

[south palm]

sentence = ""
previous_word = ""
while True:
    word = str(input("Please type in a word: "))
    if word == "end" or previous_word == word:
        break
    if not sentence:
        sentence = word
    else:
        sentence += f" {word}"
    previous_word = word

print(sentence)

[rugged lagoon]

same problem, thats why i tried with +=

[rugged lagoon]

hm that's a completely different code structure

[balmy anvil]

We are storing all words entered

[south palm]

i guess that was not the case, we should exit if the word and previous word match

[rugged lagoon]

yes your code works

@south palm

passes the test

[balmy anvil]

Yes exactly. And we need to compare 2 iterations or more back too

[rugged lagoon]

let me see if i understand what ur code does

[balmy anvil]

Aha you did it with f string

[south palm]

its comparing if the word is either end or equal to the previous word and exists
else it adds to the sentence and then assigns to previous word

[balmy anvil]

Same concept I was getting to. Just your sentence variable is my previous_words without the spaces

[south palm]

the if not sentence section, just checks if the sentence is empty, to not have space in the start of the sentence

[rugged lagoon]

#Creating variables for storing and comparing inputs
sentence = ""
previous_word = ""

#create a loop asking for multiple inputs
while True:
    #user input
    word = str(input("Please type in a word: "))
    #if condition that breaks if user inputs "end" or if latest input matches word in variable "previous_word"
    if word == "end" or previous_word == word:
        break
    #not sure what this if and else statement does
    if not sentence:
        sentence = word
    else:
        sentence += f" {word}"
    previous_word = word

print(sentence)

[south palm]

words = []
while True:
    word = str(input("Please type in a word: "))
    if word == "end" or (words and (words[-1] == word)):
        break
    words.append(word)

print(" ".join(words))

this is the list equivalent, cleaner won't you say 😛

[rugged lagoon]

sentence = ""
previous_word = ""

while True:
    word = str(input("Please type in a word: "))
    if word == "end":
        break
    
    if word in previous_word:
        break
    sentence += word + " "
    previous_word = word
print(sentence)

This is my code. Is there a way to make it work?

[balmy anvil]

Just know that the condition I talked about earlier is still true:

word1: pineapple
word2: apple

This will break the loop

[rugged lagoon]

i think that's acceptable for this exercise 🙂

But is there a way to make my code work?

I'm trying to learn what i did wrong

[south palm]

sentence = ""
previous_word = ""

while True:
    word = str(input("Please type in a word: "))
    if word == "end":
        break

    if word == previous_word:
        break
    sentence += word + " "
    previous_word = word
print(sentence)

changed in with ==

if word == previous word

[balmy anvil]

And compare with sentence I think

[rugged lagoon]

Now its working!! It was the "in" vs "==" creating problems

now it wont accept subsequence words @balmy anvil

i think

[balmy anvil]

Try

[rugged lagoon]

i mena it will*

mean

also

@south palm thanks for the solved code but that way i dont really learn anything 🙂

[balmy anvil]

Also you can do:

apple
foo
apple

Right?

[south palm]

in checks if the string exists within the other string

so like a in aaa is true

[rugged lagoon]

yes i can @balmy anvil

why is that

[balmy anvil]

Because you only compare previous_word, not sentence

if word in sentence:
    break

[south palm]

oh you mean, you didn't want it solved, my bad

[rugged lagoon]

yes i appreciate the help really but if i just get the solution i don't learn anything

thanks 🙂

[south palm]

got you

[dusty tusk]

!rule 8 @south palm

[subtle wadi]

Rules

8. Do not help with ongoing exams. When helping with homework, help people learn how to do the assignment without doing it for them.

[dusty tusk]

@rugged lagoon You said you've created some functions but I don't see any in your code.

Is that all of it?

[south palm]

@dusty tusk i get you, the sample for was for this response
at the same time i restructured it

[dusty tusk]

cool cool

[subtle wadi]

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