What I expect from making this code is, I input some numbers, then when I input strings the output is 'Not Valid', but when I press enter without putting some value to input, the output is the sum of numbers that we input before. But when I run it on VSCode, whenever I press enter, the result always 'Not Valid', and can't get out of the loop.
For example, I input: 1 2 3 a z then the output I expect is: Not valid Not valid 6
I don't know what is wrong, I just learned python 2 months ago.
sum = 0
while True:
try:
sum += int(input())
except ValueError:
print('Not Valid')
except EOFError:
print(sum)
break
When you don't input anything, input() will return the empty string. Converting it to an integer is invalid, so you get the ValueError:
>>> input() # next line is empty because I just pressed Enter
'' # `input()` returned the empty string
>>> int('') # can't convert it to an integer
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 10: ''
To trigger EOFError, send the EOF signal with Ctrl + D:
>>> input()
^DTraceback (most recent call last):
File "<stdin>", line 1, in <module>
EOFError
Here the ^D represents me pressing Ctrl + D on the keyboard (not literally typing "^D").