my program is supposed to exit it out and not give the class or whether its publ

Question

my program is supposed to exit it out and not give the class or whether its public or private if the ip address is not valid. currently as i have it, it still displays the class and public/private even when its not a valid address. how can i fix my code so when its a invalid address the program stops and doesn't display anything else? my code is below:

import sys

# Determine if this is a valid IP address

def is_valid_ip(a1, a2, a3, a4):
if 1 <= a1 <= 255 and
0 <= a2 <= 255 and
0 <= a3 <= 255 and
0 <= a4 <= 255:
print("This is a valid IP address")
else:
print("This is not a valid IP address")
sys.exit

# Determine the class of the IP address

def determine_ip_class(a1):
if 1 <= a1 <= 127:
print("This is a class A address")
elif 128 <= a1 <= 191:
print("This is a class B address")
elif 192 <= a1 <= 223:
print("This is a class C address")
elif 224 <= a1 <= 239:
print("This is a class D address")
elif 240 <= a1 <= 255:
print("This is a class E address")

# Determine if this is a public or private address

def is_private_ip(a1, a2, a3, a4):
if 10 <= a1 <= 10 and
0 <= a2 <= 255 and
0 <= a3 <= 255 and
0 <= a4 <= 255:
print("This is a Private address")
elif 127 <= a1 <= 127 and
0 <= a2 <= 255 and
0 <= a3 <= 255 and
0 <= a4 <= 255:
print("This is a private address")
elif 172 <= a1 <= 172 and
16 <= a2 <= 31 and
0 <= a3 <= 255 and
0 <= a4 <= 255:   
print("This is a private address")
elif 192 <= a1 <= 192 and
88 <= a2 <= 88 and
99 <= a3 <= 99 and
0 <= a4 <= 255:
print("This is a private address")
elif 192 <= a1 <= 192 and
168 <= a2 <= 168 and
0 <= a3 <= 255 and
0 <= a4 <= 255:
print("This is a private address")
else:
print("This is a public address")   

# Have user input 4 components of an IP address separated by commas

def main():
a1,a2,a3,a4 = eval(input("Enter 4 components of an IP address separated by commas: "))
is_valid_ip(a1, a2, a3, a4)
determine_ip_class(a1)
is_private_ip(a1, a2, a3, a4)
main()
  
  

Explanation / Answer

# Determine if this is a valid IP address
def is_valid_ip(a1, a2, a3, a4):
if 1 <= a1 <= 255 and
0 <= a2 <= 255 and
0 <= a3 <= 255 and
0 <= a4 <= 255:
return True
else:
return False
# Determine the class of the IP address
def determine_ip_class(a1):
if 1 <= a1 <= 127:
print("This is a class A address")
elif 128 <= a1 <= 191:
print("This is a class B address")
elif 192 <= a1 <= 223:
print("This is a class C address")
elif 224 <= a1 <= 239:
print("This is a class D address")
elif 240 <= a1 <= 255:
print("This is a class E address")
# Determine if this is a public or private address
def is_private_ip(a1, a2, a3, a4):
if 10 <= a1 <= 10 and
0 <= a2 <= 255 and
0 <= a3 <= 255 and
0 <= a4 <= 255:
print("This is a Private address")
elif 127 <= a1 <= 127 and
0 <= a2 <= 255 and
0 <= a3 <= 255 and
0 <= a4 <= 255:
print("This is a private address")
elif 172 <= a1 <= 172 and
16 <= a2 <= 31 and
0 <= a3 <= 255 and
0 <= a4 <= 255:
print("This is a private address")
elif 192 <= a1 <= 192 and
88 <= a2 <= 88 and
99 <= a3 <= 99 and
0 <= a4 <= 255:   
print("This is a private address")
elif 192 <= a1 <= 192 and
168 <= a2 <= 168 and
0 <= a3 <= 255 and
0 <= a4 <= 255:   
print("This is a private address")
else:
print("This is a public address")
# Have user input 4 components of an IP address separated by commas
def main():
a1,a2,a3,a4 = eval(input("Enter 4 components of an IP address separated by commas: "))
if is_valid_ip(a1, a2, a3, a4):
determine_ip_class(a1)
is_private_ip(a1, a2, a3, a4)
main()

Sample output:

Copy pastable link: https://paste.ee/p/3qWRa

Basically what this now does is, it checks whether a ip is valid, if it is not valid it exit else it goes on to print its class and private/public.

Please note I have removed print statement indicating valid/invalid address.

Let me know if you want them as well. (also note sys.exit should be sued when its really required.)

Please do give a thumbs up if I have solved your problem.

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