1. Python Connect Four
  2. Connect 4 Program Python 2017

Sockets¶I’m only going to talk about INET (i. 4) sockets, but they account for at least 9. I am doing a connect for game on python. This program is all text - based so no gui is needed. I need a piece of coding to ask the user of the program the dimensions (number of rows and columns) the board should. A tiny implementation of Connect 4 on the terminal, with explanation. Extravaganza > Selected Writings; Connect Four implemented in 3 lines of Python. A tiny implementation of Connect 4 on the terminal, with explanation. By Danver Braganza on 2017-05-22. Any program of the form: a = 10 while a > 2: a -= 1 print a. This is like my 4th week using Python and I'm still not familiar with it so I might need some help from you guys. I gotta write a little Connect 4 game in Python, I just got started and boom - I'm stuck! I tried to create a board for the game using two lists. Here is how far I got: def board.

  • Socket Programming in Python. Into listen mode.5 here means that 5 connections are kept waiting if the server is busy and if a 6th socket trys to connect then the connection is refused. First_page Python program to check if a string is palindrome or not.
  • Let us write a very simple client program which opens a connection to a given port 12345 and given host. This is very simple to create a socket client using Python's socket module function. The socket.connect(hosname, port ) opens a TCP connection to hostname on the port. Once you have a socket open, you can read from it like any IO object.
  • Problem: A Connect Four Board class. Connect Four is a variation of tic-tac-toe played on a 6x7 rectangular board. The standard board size for Connect Four is six rows of seven columns, but your Board class should be able to handle boards of any dimensions.

Socket programming is a way of connecting two nodes on a network to communicate with each other. One socket(node) listens on a particular port at an IP, while other socket reaches out to the other to form a connection. Server forms the listener socket while client reaches out to the server.
They are the real backbones behind web browsing. In simpler terms there is a server and a client.

Socket programming is started by importing the socket library and making a simple socket.

Here we made a socket instance and passed it two parameters. The first parameter is AF_INET and the second one is SOCK_STREAM. AF_INET refers to the address family ipv4. The SOCK_STREAM means connection oriented TCP protocol.

Now we can connect to a server using this socket.

Connecting to a server:
Note that if any error occurs during the creation of a socket then a socket.error is thrown and we can only connect to a server by knowing it’s ip. You can find the ip of the server by using this :

You can also find the ip using python:

Here is an example of a script for connecting to Google

# An example script to connect to Google using socket
importsocket # for socket
s =socket.socket(socket.AF_INET, socket.SOCK_STREAM)
exceptsocket.error as err:
print'socket creation failed with error %s'%(err)
# default port for socket
host_ip =socket.gethostbyname('www.google.com')
print'there was an error resolving the host'
s.connect((host_ip, port))
print'the socket has successfully connected to google

Output :

  • First of all we made a socket.
  • Then we resolved google’s ip and lastly we connected to google.
  • Now we need to know how can we send some data through a socket.
  • For sending data the socket library has a sendall function. This function allows you to send data to a server to which the socket is connected and server can also send data to the client using this function.

A simple server-client program :

Server :
A server has a bind() method which binds it to a specific ip and port so that it can listen to incoming requests on that ip and port.A server has a listen() method which puts the server into listen mode. This allows the server to listen to incoming connections. And last a server has an accept() and close() method. The accept method initiates a connection with the client and the close method closes the connection with the client.

Connect
importsocket
# next create a socket object
print'Socket successfully created'
# reserve a port on your computer in our
port =12345
# Next bind to the port
# instead we have inputted an empty string
# coming from other computers on the network
print'socket binded to %s'%(port)
# put the socket into listening mode
print'socket is listening'
# a forever loop until we interrupt it or
whileTrue:
# Establish connection with client.
print'Got connection from', addr
# send a thank you message to the client.
c.close()
  • First of all we import socket which is necessary.
  • Then we made a socket object and reserved a port on our pc.
  • After that we binded our server to the specified port. Passing an empty string means that the server can listen to incoming connections from other computers as well. If we would have passed 127.0.0.1 then it would have listened to only those calls made within the local computer.
  • After that we put the server into listen mode.5 here means that 5 connections are kept waiting if the server is busy and if a 6th socket trys to connect then the connection is refused.
  • At last we make a while loop and start to accept all incoming connections and close those connections after a thank you message to all connected sockets.

Client :
Now we need something with which a server can interact. We could tenet to the server like this just to know that our server is working. Type these commands in the terminal:

# keep the above terminal open
# now open another terminal and type:

Output :

This output shows that our server is working.

Now for the client side:

importsocket
# Create a socket object
port =12345
# connect to the server on local computer
prints.recv(1024)
s.close()
  • First of all we make a socket object.
  • Then we connect to localhost on port 12345 (the port on which our server runs) and lastly we receive data from the server and close the connection.
  • Now save this file as client.py and run it from the terminal after starting the server script.

Reference : Python Socket Programming

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This quickstart demonstrates how to use Python to connect to an Azure Database for MySQL. It uses SQL statements to query, insert, update, and delete data in the database from Mac OS, Ubuntu Linux, and Windows platforms. This topic assumes that you are familiar with developing using Python and that you are new to working with Azure Database for MySQL.

Prerequisites

This quickstart uses the resources created in either of these guides as a starting point:

Install Python and the MySQL connector

Install Python and the MySQL connector for Python on your own machine. Depending on your platform, follow the steps in the appropriate section below.

Note

This quickstart uses a raw SQL query approach to connect to MySQL to run queries. If you are using a web framework, use the recommended connector for those frameworks. For example, mysqlclient is suggested for use with Django.

Windows

  1. Download and Install Python 3.7 from python.org.
  2. Check the Python installation by launching the command prompt. Run the command C:python37python.exe -V using the uppercase V switch to see the version number.
  3. Install the Python connector for MySQL from mysql.com corresponding to your version of Python.

Linux (Ubuntu)

  1. In Linux (Ubuntu), Python is typically installed as part of the default installation.

  2. Check the Python installation by launching the bash shell. Run the command python -V using the uppercase V switch to see the version number.

  3. Check the PIP installation by running the pip show pip -V command to see the version number.

  4. PIP may be included in some versions of Python. If PIP is not installed, you may install the PIP package, by running command sudo apt-get install python-pip.

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  5. Update PIP to the latest version, by running the pip install -U pip command.

  6. Install the MySQL connector for Python, and its dependencies by using the PIP command:

MacOS

  1. In Mac OS, Python is typically installed as part of the default OS installation.

  2. Check the Python installation by launching the bash shell. Run the command python -V using the uppercase V switch to see the version number.

  3. Check the PIP installation by running the pip show pip -V command to see the version number.

  4. PIP may be included in some versions of Python. If PIP is not installed, you may install the PIP package.

  5. Update PIP to the latest version, by running the pip install -U pip command.

  6. Install the MySQL connector for Python, and its dependencies by using the PIP command:

Get connection information

Get the connection information needed to connect to the Azure Database for MySQL. You need the fully qualified server name and login credentials.

  1. Log in to the Azure portal.
  2. From the left-hand menu in Azure portal, click All resources, and then search for the server you have created (such as mydemoserver).
  3. Click the server name.
  4. From the server's Overview panel, make a note of the Server name and Server admin login name. If you forget your password, you can also reset the password from this panel.

Run Python code

  • Paste the code into a text file, and then save the file into a project folder with file extension .py (such as C:pythonmysqlcreatetable.py or /home/username/pythonmysql/createtable.py).
  • To run the code, launch the command prompt or Bash shell. Change directory into your project folder cd pythonmysql. Then type the python command followed by the file name python createtable.py to run the application. On the Windows OS, if python.exe is not found, you may need to provide the full path to the executable or add the Python path into the path environment variable. C:python27python.exe createtable.py

Connect, create table, and insert data

Use the following code to connect to the server, create a table, and load the data by using an INSERT SQL statement.

In the code, the mysql.connector library is imported. The connect() function is used to connect to Azure Database for MySQL using the connection arguments in the config collection. The code uses a cursor on the connection, and method cursor.execute() executes the SQL query against MySQL database.

Replace the host, user, password, and database parameters with the values that you specified when you created the server and database.

Read data

Use the following code to connect and read the data by using a SELECT SQL statement.

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In the code, the mysql.connector library is imported. The connect() function is used to connect to Azure Database for MySQL using the connection arguments in the config collection. The code uses a cursor on the connection, and method cursor.execute() executes the SQL statement against MySQL database. The data rows are read using method fetchall(). The result set is kept in a collection row and a for iterator is used to loop over the rows.

Replace the host, user, password, and database parameters with the values that you specified when you created the server and database.

Update data

Use the following code to connect and update the data by using an UPDATE SQL statement.

In the code, the mysql.connector library is imported. The connect() function is used to connect to Azure Database for MySQL using the connection arguments in the config collection. The code uses a cursor on the connection, and method cursor.execute() executes the SQL statement against MySQL database.

Replace the host, user, password, and database parameters with the values that you specified when you created the server and database.

Delete data

Use the following code to connect and remove data by using a DELETE SQL statement.

In the code, the mysql.connector library is imported. The connect() function is used to connect to Azure Database for MySQL using the connection arguments in the config collection. The code uses a cursor on the connection, and method cursor.execute() executes the SQL query against MySQL database.

Python Connect Four

Replace the host, user, password, and database parameters with the values that you specified when you created the server and database.

Connect 4 Program Python 2017

Next steps