How do I change this code in order to make it carry on with the program if a valid answer is entered?

Question

1.00/5 (1 vote)

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Python

userChoice3 = int(input("What is the weight of the coin bag"))
                while userChoice3 not in range (100-1000):
                    print("You need to add more coins")
                    userChoice3 = int(input("What is the weight of the coin bag"))

I can't figure out how to get the program to not ask to re enter if a valid answer is entered. The program at the minute asks to re enter even if a value over 100.

What I have tried:

I have tried using putting while userChoice3 in range instead of not in range.

Posted 11-Jan-20 1:01am

Coding1014

Updated 11-Jan-20 1:19am

OriginalGriff

v3

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Richard MacCutchan 11-Jan-20 7:16am

Hint: range (100-1000) is equivalent to range(-900) which does not make much sense. See also my answer below.

2 solutions

Solution 1

~~This is exactly the same issue as How do I stop the loop from being a continuous loop?[^]. And you already have the answer. Please do not repost the same question.~~

And if you are really struggling with the basics of Python, then go to The Python Tutorial — Python 3.7.6 documentation[^] and work through the tutorials a few times.

Posted 11-Jan-20 1:15am

Richard MacCutchan

Updated 11-Jan-20 2:31am

v2

Comments

Coding1014 11-Jan-20 7:15am

its not the same because it isn't a continuous loop

Richard MacCutchan 11-Jan-20 7:18am

It is pretty much the same. But in either case, you are not going to learn Python by posting questions like this. Do what I suggested above and work through the tutorials.

Coding1014 11-Jan-20 7:19am

i know how to use python and learning from others helps me better than watching tutorials does.

OriginalGriff 11-Jan-20 7:26am

So stop "watching tutorials" - they are generally produced by people who have no idea how to produce a video, and generally little or no mor knowledge of the subject than their audience.
Instead, go on a course, or get a good book - and read it cover to cover, doing all the exercises.

You don;t learn by looking at what people have done, you learn by doing, by using what you have been told. That is the basis of a skill - and they are all the same. Looking at examples doesn't tell you anything about why something is the way it is, what alternatives were considered, and why they weren't implemented. It just presents you with a "single solution" to a "single problem" - and you need skills to cope with solutions to generic classes of problems instead.

If you like, it's like being able to drive: slam it in gear and stamp on the "go" lever works, but it doesn't help you know what to do when you find the way blocked by a fallen tree. Or when you need to parallel park. The "driving skill" helps you to work round problems as you encounter them instead of having a single "driving solution" which only works under one set of circumstances.

Richard MacCutchan 11-Jan-20 7:41am

I don't think so.

OriginalGriff 11-Jan-20 7:20am

Not quite the same - this time he is assuming that 100-1000 is a range, rather than a single negative value.

Coding1014 11-Jan-20 7:21am

So what do I need to do to solve this?

OriginalGriff 11-Jan-20 7:27am

See the other solution...

Richard MacCutchan 11-Jan-20 7:44am

Do what I suggested and go to the link I gave you and work through the official tutorials, in order to learn the language properly. The majority of YouTube offerings are mediocre at best.

Richard MacCutchan 11-Jan-20 7:42am

You are right, of course, but similar enough that OP really needs to learn the language.

OriginalGriff 11-Jan-20 7:44am

Oh yes. Very much so. I suspect he's looking for a short cut; perhaps "learning to code by osmosis" ... :sigh:

Richard MacCutchan 11-Jan-20 7:46am

"learning to code by osmosis"
Is that like when you put a glass against the bedroom wall to listen to he neighbours?

OriginalGriff 11-Jan-20 8:11am

And you never know what you will learn that way, either! :laugh:

OriginalGriff 11-Jan-20 10:35am

First thing: it doesn't matter. We have no way of telling your gender, and it wouldn't be relevant if we did. This is the internet, where "men are men, women are men, and thirteen year old girls are FBI agents", remember?
Unless you specifically tell people you gender / sexual identity the default position is you use male pronouns as there are no "neutral pronouns" in English other than "it" which is generally considered more offensive than "he".

Secondly, we aren't "taking the mick" "because [you] didn't know the answer to something". We read your questions, and base our comments on the effort you have put into solving the problems yourself, which - to be frank - is very, very little. And if you are studying development for GCSE level, then you aren't playing much attention in class, or you wouldn't be "watching tutorials" in the hope that the ability to code magically descends upon you. Go back a few comments, and read what I said again: We get a lot of students who when faced with homework just go "someone else can do it for me" in the vain hope they will a) get a good grade, and b) learn how to do it from handing in others work as their own.
Neither of those works: most teachers are well aware of sites like these, and the technical word for it is "plagiarism". Add that to the reasons I already explained for actually doing work yourself and you really aren't helping yourself in the long term.

Remember: the next piece of homework will be harder because it builds on the knowledge and skills you have demonstrated to your teacher by handing in homework you don't understand ... and when you get to the exams, if you don't even understand the basics and haven't built the skills by then, you stand no chance at all of passing because you can't get anyone to do the work for you.
Think about it.

OriginalGriff 11-Jan-20 7:27am

Downvote countered.

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OriginalGriff · Accepted Answer · 2020-01-11T01:20:00

Solution 2

Check the definition of Range: Python range() Function Explained with Examples[^]
You need the two argument version. 100-1000 is -900, not a range.

Python

while userChoice3 not in range (100, 1000):
   print("You need to add more coins")

Posted 11-Jan-20 1:20am

OriginalGriff