Sockets Tutorial with Python 3 part 1 - sending and receiving data 

That feeling when you spend hours weeding through needlessly complicated tutorials until you find the one that just makes sense and is 1000 times simpler than any of the others.

AF_INET means Address Family InterNET for IPV4. IPV6 is AF_INET6, Bluetooth is AF_BLUETOOTH, unix sockets are AF_UNIX, etc.

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This is by far the most easily understandable python socket tutorial I've come across! It's like a ray of hope while I'm doing my final year project.

The way you explain it really shows you understand the topic. Love to see that in a tutorial because it means it's a good tutorial.

I really like your teaching style, explaining every line briefly, makes things a lot clearer. Thank you!

Full marks to you for using a nice big font to make the code clearly easy to read on RU-vid. You would not believe how many coding examples make you have to squint to figure out what they were typing ...or maybe you would. Thanks again, nice presentation.

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Dude, i see a lot of tutorials dealing with socket programming, by far it is the best! Clear, Sharp, Smart!

I have been playing with python programming for a few weeks as part of self learning. Socket programming felt bit troublesome and I always had issues when running. Came upon your video above and tried the way you showed above and i made connection. hurray!!. I am in socket programming. great feeling. thanks man

Very entertaining video. I am still very new to python and I've been writing some basic scripts for work. This video is exactly what I was looking for. Thank you!

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I recently wrote similar socket code in C, and its interesting how closely Python and C map here. AF stands for address family. It denotes the kind of addresses a socket can communicate with. In this case, the socket uses IPv4 addressing. Similar families are AF_INET6 for IPv6, AF_UNIX for IPC on Unix systems, AF_BLUETOOTH for Bluetooth and so on.

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Thanks for this! Are you planning on making a full "network programming with python" series? I've been interested in learning more about this but never really found a good jumping off point, and as a back-end web developer, I want to learn more about the hardware/software interfaces I'm working with. Your videos are really good and I love the work you're doing!

That’s exactly what I was looking for! Thanks, sir!

One of the best tutorials on Yotube. Thank you so much for such a great and enthusiastic explanation! It all finally works

Hi dex! Love your tutorials! Is there any chance you would make an updated threading tutorial? The sockets library goes very well together with threading functionality.

Hi sentdex. Good tutorial, it get's to the point quickly without painfully explaining the history and the why and on and on. Just enough background and just get to it! I like it. Just one note. I know this works for a tutorial purpose, but when you concatenate a string with += in a loop, it's dangerous. If this were a very large amount of text, the stack memory could exhaust. This is because strings are immutable and so each loop, it creates another copy of the string plus the added part each loop. In a fast loop with many iterations, the python garbage collection will not have enough time to release the memory for the previous copies and run out of stack memory. It is good Python practice to not use that method in a loop. Rather, append to a list of strings in the loop, then join them together at the end. Just a word of caution for those who may want to scale something like this up.

Was looking for something straightforward on this topic, thanks!

Thanks man! Waiting for the next video. Learn alot from your tutorials, commenting for the 1st time on any youtube video.

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Quick note, I think often you first send the size kf the message as a fixed amount of bytes, so you can have a variable message length later. Just using a fixed buffer either requires you to pad the message or you will receive multiple messages in one recv call when the calls are coming in fast enough

I was actually waiting for this tut. I couldn't find anything that I could understand. Thanks alot! I'll watch it right away!

Thanks! Moving to the next video... Appreciate the in-depth explanations. Some stuff I know.. some I am clueless.. those clues are critical! :)

Thank you for this tutorial, i tried to use sockets in python a while back and got quite confused at first.

Thank you for helping me with my first python project. Creating a socket :)

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If I'm not mistaken, then 1024 is the packet size. I think this will vary depending on what your network can handle (i.e. jumbo frames). You can test if you can send/receive a specific size packet by using *ping -l [size] [address]* - The *l* is a lowercase L

Thankyou so much for this tutorial!

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Short and very impact video, really good for beginner like me.

I'm a new student trying to learn, so I can become a programmer with python and I have a project on how to make a port scan. So far I already make a port scan with Python3, and it scans fine, give a date and everything working good so far. I see on your video tutorial you give example on how to send and receiving data. I would like to ask for your advice if you can and guide me on how I will add this 3 in a Python script, I have: 2. System should look for all the ports between the range of 1 to 1025 3. If the Ports is open, it should create a file and add an entry for port number 4. In case of any exception for instance “host is not available”, “host name could not be resolved” or due to any other error, you need to write that exception into the same file. Thank you and Merry Christmas.

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Oh man, perfect explainer. Thanks!

Excellent explanation! Thank you!

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Hi, accept() function creates a brand new socket that is used to send and receive data. That way the socket object "s" that you created at the beginning is used to receive the request from multiple clients. If you use socket object "s" to send and receive data that you cannot handle multiple clients at the same time. That's why the new socket obtained by calling accept() is used to send and receive data.

`socket`: This is the module in Python that provides access to the BSD socket interface. It is used to create networking applications. `AF`: Stands for "Address Family". It specifies the format of the address. In this case, `AF_INET` indicates the IPv4 address family. `INET`: Stands for "Internet". This indicates that the addresses are IPv4 addresses, which are used for internet protocol version 4.

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4:00 I may be mistaken but i'm pretty sure it makes sense to use clientsocket.send() (and not s.send() or s.send(clientsocket)) because s is the welcoming socket only. By that I mean clients request to connect via that socket, but they don't actually connect to it, we make a new one (clientsocket) specifically for them, and that's what they connect to. So clientsocket and s are both sockets on the server side that are both bound to the same port, it's just s is used for setting up connections whilst clientsockets are used for making the actual connections.

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Hi there! Thanks to you I was able to make a server-client(s) connection on my own. But I struggle finding a way to make the communication between the two along 2 or more distant computers. Can you PLEASE show us how to do this without buying hosting or domain? Honestly, I would be your top fan if you do this

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the AF_INET constant is used to specify the address family for IPv4 sockets. AF stands for "Address Family", and INET stands for "Internet Protocol version 4".

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Excellent explanation. Thx

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12:38 My code is exactly the same, yet the message that I receive is only "erver!" instead of "Welcome to the server!". It seems as if it's not buffering correctly. How can I fix that?

I don't understand how your code ever gets to if len(msg)

After doing socket programming in Java this seems very elegant.

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Thanks for the sockets work describe

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Awesome video thanks! Question: does the socket named s in the server code refer to the same s in the client code? In other words is the "s" in both server.py and the "s" in client.py refer to the same socket (the socket on the server) Or do both S's refer to the socket on the client. Thanks. Maybe they are the same S since they are on the same machine??

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Loved the video!!! Please do one for UDP connection!!

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I think you should have pointed out the distinction that the first socket you create in the server (s) is not actually the socket that will be used for communication. It is the listening socket, which only gets connection requests. The clientsocket that is created is the actually communication socket and is actually on a different port. I think the early awareness in intro tutorials will help avoid confusion. Great tuts, btw!

A sentdex video? First liking, then watching

1:18 AF_INET is an address family that is used to designate the type of addresses that your socket can communicate with (in this case, Internet Protocol v4 addresses). When you create a socket, you have to specify its address family, and then you can only use addresses of that type with the socket. The Linux kernel, for example, supports 29 other address families such as UNIX (AF_UNIX) sockets and IPX (AF_IPX), and also communications with IRDA and Bluetooth (AF_IRDA and AF_BLUETOOTH, but it is doubtful you'll use these at such a low level). For the most part, sticking with AF_INET for socket programming over a network is the safest option. There is also AF_INET6 for Internet Protocol v6 addresses. Hope this helps, Share Improve this answer Follow edited Nov 17, 2021 at 0:02 Gabriel Staples's user avatar Gabriel Staples 27.5k99 gold badges149149 silver badges202202 bronze badges answered Oct 20, 2009 at 11:46 George Shore's user avatar George Shore

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