Variables on Python

Question

Hello guys, I am learning Python, I would ask you how Can I declaration kinds ( string, decimal, integer...) of variables.. And then, I Would ask if how Can I add a valour into a variable that the user insert it like input.... Do you help me? ( sorry for my bad English, I am studying also this language✌)

Answer 1

You're welcome 😊
Happy learning to you!

Answer 2

You also should use:
if ...
elif...
elif...
elif...

Answer 3

And there are not needed parenthesis. This won't cause any trouble, it's just useless
scelta = input(...)

Answer 4

You also need to convert your second and third inputs to integer type with int()
and you still don't use elif + have not indented properly.

Answer 5

Good job 👍

Answer 6

You must write it on 3 separated lines
4
5
addizione

Answer 7

Nothing's easier !
myvar = 7
this way, you declared the variable myvar, and assigned it a value of 7 at the same time. Python automatically sets it as an integer.
Same goes for other types:
myvar2 = 'tree'
you just delcared a string.
and so on.
If you really need to declare a variable first, without assigning it any value, since python 3.6, there is:
myvar : int
(...)
myvar = 7
I suggest you to start learning Sololearn's Python course where it is well explained : )
https://www.sololearn.com/Course/Python/
About your second question, on sololearn, you can assign user input to a variable this way :
myvar = input()
type of your variable will then be string. You'll need to turn it to an integer if that's your need (myvar = int(input()))

Answer 8

You need to add " " to your strings:
If... =="divisione":

Answer 9

And there are unneeded parenthesis. This won't cause any trouble, it's just useless
scelta = input(...)

Answer 10

Variable type is defined by the value it is assigned, you don't need to use any datatype headings like in Java or C++.
But I didn't understand your second question.

Answer 11

Niko Python's input function returns all the input as string, programmer might add some functionality to manipulate the returned string like wanted, there might be some builtin (__bultins__) functions or methods to perform some simple things or programmer can define his own ways to produce the input.

Answer 12

Niko Your example in C++ I would translate as:
print("you insert first number")
NameVar = int(input())
But it's difference is that an error occurs, if user types a non integer value.
It would require few extra lines to handle it.

Answer 13

Niko input returns strings, strings can be changed to integers with int function (constructor), int(string), but it raises an error, if string has a non int. int("74") would be ok and return 74, but int("abc") would return an error.

Answer 14

Niko "elif" means "else if"

Answer 15

In SoloLearn you need a newline (in input event) for each input function.

Answer 16

Thank you so much! Now my code work without problems!!
This is my first code in Python😁 Thanks very much for your help! 😘

Answer 17

Thank you so much for replied me!
Generally now I use VisualBasic ( I say also little C++) and I want also learn Python. I am studying now the basic, and thanks your answer I understood also declaration of variables on Python. I thought that , like C++ , there was instruction for this.
Now, I ask you, If for example, I don't say value of variable and , with input instruction, the user insert this within, how Can I do this?
For understand better:
How Can I translate this instruction in Python?
NameVar = Val(inputbox("You insert first number"))
Or C++
cout<<"you insert first number"<<endl;
cin>> NameVar;

Answer 18

So, for example, do this instuction
NameVar = input("you insert first number") , is not correct ?
On Python is not possible that the user insert like input a valor?
If I would write a code for do a addiction of two numbers that thr user insert, how can I do this on Python?

Answer 19

https://code.sololearn.com/cmlhPF975XJ4/?ref=app

Answer 20

You are using a weird syntax