I want to write a code to see if an input number is natural or not but it won't work can you tell me what am I doing wrong?

Question

a=0
while True:
a+=1
b=[a]
c=input()
print(c in b)
#i also tried print([c] in b)

Answer 1

If you tried this code in the app, one problem is that you ask form input within a loop. SL app does not allow for this.

Also be aware that input() will return a value in string format no matter what we type in. So you need to explicitly convert c to a numeric type.

Another issue is that the while loop will run infinitely as there is not break condition specified.