Check if the input value is valid in list using python

Question

The programm is check if input value is valid in list. below is my code. could you please help?thanks

while True:  
    try:
        count = 0
        Day_list = []
        days =  int(input("Enter number : "))
    except ValueError:
        print("Please input the integer")
    else:
        for i in range(days): 
            Day_list.append(float(input("Enter the day "+str(i+1)+ ": " )))
            if( 0<= Day_list[i] <=10):
   
                print('good' )
                                     
           else:
                print('Amount cant be negative, try again')
                break

i would like check the value one by one

eg. Enter the day 1 : -1

then output : Amount cant be negative, try again

return Enter the day 1 : 1

Enter the day 2 :

but i dont have idea where is mistake,thanks

Maybe your indentation is wrong, should the `if( 0<= Day_list[i] <=10):` be nested under the for loop? — rassar, Oct 26 '22 at 02:04
Hi, thanks all, I want to check every one, if the first day input value wrong, then output the message, but the program checks the all the value first , then show the wrong message. — iamnew, Oct 26 '22 at 02:13
applying the suggestion by rassar (if nested in the loop), it worked for me: it makes the check number by number. Maybe you can show which are the values you are inputting and the actual vs. expected output. — Ignatius Reilly, Oct 26 '22 at 02:26
Hi @IgnatiusReilly, thanks for your reply and support. how to input until a valid response. i modify my code and i try to input the wrong value, and then the program will show next step, how to return to back until input the valid value.thanks — iamnew, Oct 26 '22 at 03:28
@iamnew maybe this [post](https://stackoverflow.com/questions/23294658/asking-the-user-for-input-until-they-give-a-valid-response) can help. — Ignatius Reilly, Oct 26 '22 at 04:32

Henro Sutrisno Tanjung · Answer 1 · 2022-10-26T05:03:39.587

here you are:

while True:  
    try:
        count = 0
        Day_list = []
        days =  int(input("Enter number : "))
    except ValueError:
        print("Please input the integer")
    else:        
        if days >= 0:
            for i in range(days):             
                valid = False
                while not valid:
                    try:    
                        Day_list.append(float(input("Enter the day "+str(i+1)+ ": " )))
                        if( Day_list[i] >= 0 and Day_list[i] <=10):
                            print('good' )
                            valid = True
                        
                    except ValueError:
                        print ('input is not valid')
                break                   
                    
        else:
            print('Amount cant be negative, try again')

Hi Henro Sutrisno Tanjung, thanks for your reply and support, how to check the value when i input the wrong data , the program will show the error message and then i need to input again, if it is vaild value , the program will be show next step? thanks — iamnew, Oct 26 '22 at 03:15

Check if the input value is valid in list using python

1 Answers1