find prime no.

Question

num=int(input("Num:"))
if num>1:
for i in range(2,num):
if num % i==0:
print("not prime")
break
elif num % i!=0:
print("prime")
else:
print("invaid entry")

I wanted to find prime no.
Can you let me know what is wrong?

Answer 1

Gouri Shinde Here's a shorter version:

print("invalid entry" * ((num := int(input())) < 2) or "prime" * (num == 2 or all(num % i for i in range(2, num))) or "not prime")

# Hope this helps

Answer 2

i think all you need to do is remove “break”. the code below was able to loop through all the numbers in the range.

num=int(input("Num:"))
if num>1:
for i in range(2,num):
if num % i==0:
print("not prime")
elif num % i!=0:
print("prime")
else:
print("invaid entry")