Using Python to convert the subnet mask address to the bit length

One day, using Centos7, when discovering the network configuration, the subnet mask needs to be converted manually, because the CENTOS7 network is configured as follows:

NMCLI Connection Enp4s0 Modify Ipv4.methord manual ipv4.address "192.168.1.120/24" Ipv4.gateway "192.168.1.1" Ipv4.dns "2 23.5.5.5 "

A configuration item with no subnet mask. Then, write a function that implements the mutual transformation of the subnet mask and the bit length.

One: The subnet mask is converted to bit length:

# Coding:utf-8 def exchange_mask (mask): # Calculates the number of ' 1 ' in a binary string count_bit = Lambda Bin_str:len ([I for I in Bin_str if I     = = ' 1 ']) # The subnet mask for the split string format is a four segment list mask_splited = Mask.split ('. ') # Convert each satin netmask to binary, calculate decimal mask_count = [Count_bit (Bin (int (i))) for I in mask_splited] return sum (mask_count) if __name_ _ = = ' __main__ ': Print exchange_mask (' 255.255.0.0 ')

Second: The bit length is converted to a subnet mask:

#codint = Utf8def Exchange_maskint (mask_int): Bin_arr = [' 0 ' for I in range (+)] for I in range (Mask_int): Bin_arr[i] = ' 1 ' tmpmask = ['. Join (Bin_arr[i * 8:I * 8 + 8]) for I in range (4)] Tmpmask = [Str (Int. (TMPSTR, 2)) for TMPSTR in TMPM Ask] return '. '. Join (tmpmask) if __name__ = = ' __main__ ': Print Exchange_maskint (24)

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Using Python to convert the subnet mask address to the bit length