Question

Write a program that asks the user for 15 letters, accumulates them into a single string variable, and prints the string.

Answer 1

@Kainui

Answer 2

@pranabanimesh

Answer 3

What have you done so far?

Answer 4

def main():
a = eval(input("Please enter a letter: "))
b = eval(input("Please enter a letter: "))
c = eval(input("Please enter a letter: "))
d = eval(input("Please enter a letter: "))
e = eval(input("Please enter a letter: "))
f = eval(input("Please enter a letter: "))
g = eval(input("Please enter a letter: "))
h = eval(input("Please enter a letter: "))
i = eval(input("Please enter a letter: "))
j = eval(input("Please enter a letter: "))
k = eval(input("Please enter a letter: "))
l = eval(input("Please enter a letter: "))
m = eval(input("Please enter a letter: "))
n = eval(input("Please enter a letter: "))
o = eval(input("Please enter a letter: "))
"".join(["'a','b','c','d','e','f','g','h','i','j',\
'k','l','m','n','o'"])

main()

Answer 5

that is not correct. I know it!

Answer 6

@Kainui

Answer 7

Sorry, the site is slow so it didn't tell me you responded for some reason

Answer 8

So you know it's not right, what can you tell me about why it's wrong? What happens when you run the program?

Answer 9

it has to print the 15 letters in one string

Answer 10

when it ask for the first letter, it entered it and it says that letter is not defined

Answer 11

What does this code do? ` a = eval(input("Please enter a letter: "))`

Answer 12

I suppose [a to o] evaluates the 'letters' I am entering and prints it out like a whole word

Answer 13

I think the key thing we need to understand is that `eval()` and `input()` are doing two different things, can you try to explain them to me? You have the right idea I believe, but we need to change what we're doing. Can you give me an example of how you would use each of those separately by themselves, like with a simple example?

Answer 14

def main():
x = eval(input("enter a number: "))
b = (x * 100)
print("the total is: ",b)

main()

Answer 15

i do not learn how to use them separately

Answer 16

i am sure the program is much shorter than what I wrote.

Answer 17

I just copied and pasted everything for 15 times. It does not make sense

Answer 18

Ahhh ok I see. I will teach you since this is very important, and it's usually a bad idea to have eval(input("stuff")) since it can allow someone to type other code in to be evaluated!

so first let's look at it from the inside out since that will hopefully make more sense. `x = input("text")` simply puts whatever text is in the quotes to the screen and lets you type in a value. That value will be stored as x in this example, or it can act as the variable itself if you want to use it immediately like you've done here. So if the next line was `eval(x)` that is the same as `eval(input("text"))` since they are the same thing. With me so far?

Answer 19

yes

Answer 20

Alright so now what's `eval()` doing? It's just evaluating whatever is in parenthesis. So in your code here
```
x = eval(input("enter a number: "))
b = (x * 100)
print("the total is: ",b)
```
eval is just taking the input's value and evaluating it, so since it isn't doing anything it should be equivalent to doing this, try it out and check.

```
x = input("enter a number: ")
b = (x * 100)
print("the total is: ",b)
```

What eval() does then is like I said earlier, it lets you run code from in it, which includes doing mathematical functions. This can be a security hazard since someone can evaluate code that erases things on your computers while using your program.

Answer 21

it is just printing the number 100 times

Answer 22

What is?

Answer 23

the program you just gave me. It is printing the entered number 100 times

Answer 24

It's the exact same program you gave me, I didn't change anything except show that you can replace
`x = eval(input("enter a number: "))` with `x = input("enter a number: ")`

Answer 25

i need to finish this program by 11:50 or I will lose points

Answer 26

x = input("enter a number: ")
If I did this, it is printing the entered number 100 times. I just tried it!

Answer 27

Oh I'm sorry I am confusing my syntax up my bad, the problem is that x is a string and not an int, so when you do ("number" *100) it is just putting 100 copies of the string next to each other. So you should be casting it to an int with this method...

`int(input("enter a number: "))`

But this is not important or useful to you right now, the point I am trying to make is that eval does mathematical operations but you only need a string.

Try this code out:

```
s=input("type letter: ")
print(s)
```

That should make my point a little more clear and get you on the right path, sorry for the confusion!

Answer 28

it is working now!

Answer 29

can you please answer my question?

Answer 30

Write a program that asks the user for 15 letters, accumulates them into a single string variable, and prints the string.

Answer 31

```
myList = []
counter = 0

while counter < 15:
myList.append(str(raw_input("Enter a string: ")))
counter += 1

print myList
myStr = "".join(myList)
print myStr
```

Answer 32

@ahamed. Currently what I've given you is a way to take input and turn it into strings. But what you need is to limit the user to only entering in single characters, ask for 15 of them, and then concatenate them into a single string. I can't answer your question for you, as that's against the code of conduct, but I can help you understand what methods do.

Answer 33

```
myNewStr = ""
counter = 0
while counter < 15:
myNewStr += str(raw_input("Enter a string: "))
counter += 1

print myNewStr
```

Answer 34

@pranabanimesh i am getting errors, man

Answer 35

Remember, the input has to be characters, not a string.

Answer 36

i am getting errors

Answer 37

@ahamed. what error, did you copy paste the complete code?

Answer 38

yes i did! several error and i tried to fix them too!
*no parenthesis on the print
*mynewstr not defined

Answer 39

sorry, this is python 2.7, are you using python 3?

Answer 40

yes

Answer 41

please try the program here and send it to me.
http://repl.it/languages/Python3

Answer 42

I have little knowledge on python 3. the above code works for python 2.7

Answer 43

http://www.pythontutor.com/visualize.html#togetherjs=DodaOfFsrV

Answer 44

@pranabanimesh give this a guy a medal and fan him

Answer 45

http://prntscr.com/6a55ep dead subject seems very alive XD