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Python Lesson 1 An Introduction What is Python? Python is a programming language that is often used to develop web applications. The creator of Python, Guido van Rossum named the language after the 1970s BBC Comedy series ‘Monty Python’s Flying Circus’ Sequencing The most simple type of program uses sequencing, a set of instructions carried out one after another. Start Display “Computer” Display “Science” Display “Rocks” End Flowcharts Flowcharts are used to plan programs before they are created. The start or end of the program. There may be more than one way to complete the algorithm and there may be more than one end box. A process, that is doing something for example calculating something. An input or output, for example: Input num1 A decision, YES or NO, or a choice of paths, for example: Is it a weekday? A subroutine or self-contained program that can be used as required. When a flowchart will not fit onto a single page we use this shape to show how the sections of the flowchart connect together. Strings In programming we usually call normal text a string. A string is a collection of alphabetic and/or numeric characters. We tell the computer something is a string by putting quote marks around it. “What’s your name?” Variables When programming it is often necessary to store a value for use later on in the program. A variable is a label given to a location in memory containing a value that can be accessed or changed. Think of a variable as a box with a label that you can store information in. Using Python Match the Python code to the correct part of the flowchart. Start Display “Computer” Display “Science” Display “Rocks” End Python Open the Python 3.3 > IDLE Python GUI. At the command line try typing in some of the following : 3+4 5/6 9*5 Print (‘hello’) What happens? Example Match the Python code to the correct part of the flowchart. Start Input Name Display “Hello “ + name End Create a Python program based on the code above and save it as variables.py. Press F5 to run it. The Turing Test Watch the video The Turing Test Click Here Turing Test Simulator Create your own Turing Test Simulator Use variables and IF statements Python Challenges Now practice your sequencing skills by completing two of the Python Challenges. Choose two from challenges 1 to 5.