A sample socket programming in python using low level networking interface socket. You will find follwing on top of vanilla implementation you find in any first tutorial link you get from googling:

• Multithreading to handle multiple client
• Use of pickel to serialize any type of data
• Handling of variable length data by passing data size along with payload
• Passing data type with payload as additional information to take specific action accordingly (eg. if data type is image then save it)
• Using keyboard interrupt to close client and server cleanly
• Specifying the list of trusted client so that no untrusted client could be connected

Note: While writing this program python 3.7.4 was used

Feel free to request more feature you would like, i wil try to add it when i get time