Python Tidbits

Collection of random python snippets

# Function to find a string in a file and return the next line
def return_next_line(search_string, file_name):
    with open(file_name, "r") as ifile:
        for line in ifile:
            if search_string in line:
                temp_string = next(ifile)
                return temp_string

# Function to return if an IP address is private or not
def is_ip_private(ip):
    # https://en.wikipedia.org/wiki/Private_network
    priv_lo = re.compile("^127\.\d{1,3}\.\d{1,3}\.\d{1,3}$")
    priv_24 = re.compile("^10\.\d{1,3}\.\d{1,3}\.\d{1,3}$")
    priv_20 = re.compile("^192\.168\.\d{1,3}.\d{1,3}$")
    priv_16 = re.compile("^172.(1[6-9]|2[0-9]|3[0-1]).[0-9]{1,3}.[0-9]{1,3}$")
    
    res = priv_lo.match(ip) or priv_24.match(ip) or priv_20.match(ip) or priv_16.match(ip)
    return res is not None