Validate an IP address using Python without using RegEx

# Python program to verify IP without using RegEx
# explicit function to verify IP
def isValidIP(s):
    # check number of periods
    if s.count('.') != 3:
        return 'Invalid Ip address'
    l = list(map(str, s.split('.')))
    # check range of each number between periods
    for ele in l:
        if int(ele) < 0 or int(ele) > 255 or (ele[0]=='0' and len(ele)!=1):
            return 'Invalid Ip address'
    return 'Valid Ip address'
# Driver Code
print(isValidIP('666.1.2.2'))

# Python program to verify IP without using RegEx
# explicit function to verify IP
def isValidIP(s):
    # initialize counter
    counter = 0
    # check if period is present
    for i in range(0, len(s)):
        if(s[i] == '.'):
            counter = counter+1
    if(counter != 3):
        return 0
    # check the range of numbers between periods
    st = set()
    for i in range(0, 256):
        st.add(str(i))
    counter = 0
    temp = ""
    for i in range(0, len(s)):
        if(s[i] != '.'):
            temp = temp+s[i]
        else:
            if(temp in st):
                counter = counter+1
            temp = ""
    if(temp in st):
        counter = counter+1
    # verifying all conditions
    if(counter == 4):
        return 'Valid Ip address'
    else:
        return 'Invalid Ip address'
# Driver Code
print(isValidIP('110.234.52.124'))