Python Programming – Python Character Set

Python Programming – Python Character Set

You can learn about Introduction to Python Programming Programs with Outputs helped you to understand the language better. Python Programming – Python Character Set The character set is a set of valid characters that a language can recognize. Python uses the character set to declare identifiers. There are two types of character sets in the Python language. These are: (a) Source characters (b) Execution characters /Escape sequences Source Characters Using source characters, the source text is created. Following is the list of source characters: Alphabets : A to Z, a to z and _ (underscore) Numbers : 0 to 9 Special characters : + – * / A ~% = ! & I (){}[]?”, ;: \ # blank ” Python Programming – Introduction to Python Interpreter and Program Execution Python Programming – Python Style Rules and Conventions Introduction to Python Programming – Compiler Execution Characters / Escape Sequences These characters are interpreted at the time of execution. The values of execution characters are implementation-defined. The characters on the keyboard can be printed or displayed by pressing the key. But some characters, such as line feed, form feed, and tab, cannot be printed or displayed directly. Python provides the mechanism to get such…

Python Programming – IDLE Menus

Python Programming – IDLE Menus

You can learn about Introduction to Python Programming Programs with Outputs helped you to understand the language better. Python Programming – IDLE Menus IDLE has two window types, the Shell window, and the Editor window. It is possible to have multiple editor windows simultaneously. IDLE’s menus dynamically change based on the window that is currently selected. Each menu documented below indicates which window type it is associated with. The File menu provides the ability to open, save, print, close files, etc. The Edit menu provides options for the usual editing commands such as Undo, Redo, Copy, Cut, Paste, Find, and Replace. The Format menu provides options for indenting, commenting, uncommenting a section of code, etc. The Run menu provides the Run Module, which executes the Python code currently in the Editor window. Python Programming – Creating a Simple “Hello World” Program Python Programming – How To Start Python Python Programming – Technical Strength Of Python The F5 shortcut key is a convenient way to execute a program. If the module has not been saved, IDLE will prompt the user to save the code. The Options menu provides the option Configure IDLE for configuring various aspects of IDLE, including the fonts used, the…

Python Programming – How To Start Python

Python Programming – How To Start Python

You can learn about Introduction to Python Programming Programs with Outputs helped you to understand the language better. Python Programming – How To Start Python After installation is successfully completed, you can start Python in the following ways (see Figure 3.11). These are: (a) Python Shell – Interactive mode (Commandline) (b) Python Editor – Script mode (Integrated Development Environment – IDLE) Python Shell is used to execute a single Python command and get the result in the same window. It waits for the input command from the user. As soon as the user enters the command, it executes it and displays the result. IDLE is a simple Integrated Development Learning Environment that comes with Python. The important feature of IDLE is that it is a program that allows the user to edit, run, browse and debug a Python program from a single interface. Python Programming – Technical Strength Of Python Introduction to Python Programming – Interpreter Introduction to Python Programming – Documentation Interactive Mode (Command-line) Interactive mode of working means you type the command one at a time, and Python executes the given command and gives you output. An interactive interpreter of Python is also called Python Shell. Follow these steps to…

Introduction to Python Programming - The Basic Model Of Computation

Introduction to Python Programming – The Basic Model Of Computation

You can learn about Introduction to Programming Using Python Programs with Outputs helped you to understand the language better. Introduction to Python Programming – The Basic Model Of Computation The Basic Model Of Computation A program is a set of instructions, written in a computer language, to perform a specific task. In an attempt to solve problems on a computer, one has to write a step-by-step solution using simple instructions for operations and thus, obtain the results. There would be a number of methods to solve a given problem, and therefore, solutions may differ from person to person. However, in all cases, the basic steps remain the same. These basic steps are as follows: Formulating the problem and deciding the data types to be inputted. Identifying the steps of computation that are necessary for getting the solution. Identifying decision points, i.e., under what circumstances a particular operation is to be performed and when not to be performed. Knowing the expected results and verifying with the actual values. Procedure for Problem Solving Problem-solving is the process involving basic sequential steps necessary to arrive at the solution of the given problem. It is a logical process of breaking down the problem into small parts…

Introduction to Python Programming – Compiler

Introduction to Python Programming – Compiler

You can learn about Introduction to Programming Using Python Programs with Outputs helped you to understand the language better. Introduction to Python Programming – Compiler Compiler A program that translates a high-level language program into a machine language program is called a compiler. It checks all kinds of limits, ranges, errors, etc. But its program execution time is more and occupies a larger part of the memory. It has slow speed and low efficiency in memory utilization. If a compiler runs on a computer for which it produces the object code, then it is known as a self or resident compiler. If a compiler runs on a computer other than that for which it produces object code, then it is called a cross-compiler. The process of producing an object program using a compiler is called compilation. After compilation, you get a file known as an object file which is in machine language. There are two steps in executing a program, the compilation phase and the execution phase. The compilation is required to detect syntax and semantic errors in a program. The compiler converts the program into machine language so that it can execute the program on the machine. (See Figure 1.4). Python…

Introduction to Python Programming – Testing A Program

Introduction to Python Programming – Testing A Program

You can learn about Introduction to Programming Using Python Programs with Outputs helped you to understand the language better. Introduction to Python Programming – Testing A Program Testing A Program In order to completely test a program logic, the test data must test each logical path of the program. Hence, the selection of proper test data is very important in program testing. In general, the test data selected for testing a program should include: a. Normal data, which will test the generally used program paths. b. Unusual but valid data, which will test the program paths used to handle exceptions. Such data might be encountered occasionally while running the program. c. Incorrect, incomplete, or inappropriate data, which will test the error-handling capabilities of the program. This is done in order to see how the program reacts in abnormal and unusual circumstances. If a program runs successfully with the test data and produces correct results, it is normally released for use. However, even at this stage, errors may remain in the program. In the case of complex systems, there may be thousands of different possible paths through which the program is to be tested, and it may not be practical to trace through…

Python Programming - Statements

Python Programming – Statements

You can learn about Operators in Python Programs with Outputs helped you to understand the language better. Python Programming – Statements A Python statement is an instruction or a unit of code that the Python interpreter can execute. In computer language, complete command is called a statement. Examples of the statement are: >>> print(12 + 15) . 27 This is because you told the system to print the result of the expression 12 + 15, which is a complete statement. However, if you type : >>> print(12 +) you will get a syntax error. Other statements could be the following: >>> print (“Welcome to the world of Python”) Welcome to the world of Python >>> print(“Sum of 2 + 5 = “, 2+5) Sum of 2 + 5 = 7 Python Programming – How To Start Python Python Programming – Variable Python Programming – Using Comments The first statement asks Python to display string literal Welcome to the world of Python. In the second print statement, Python prints the part within quotes “Sum of 2 + 5 = ” followed by the result of adding 2 + 5, which is 7. To print multiple items on the same line, separate them with…

Python Programming – Technical Strength Of Python

Python Programming – Technical Strength Of Python

You can learn about Introduction to Python Programming Programs with Outputs helped you to understand the language better. Python Programming – Technical Strength Of Python Python has the following technical features: (a) Easy-to-learn, Use and Read: Python has relatively few keywords, a simple structure, and a clearly defined syntax. So, it is easy to learn and use. To run a Python program, you simply type it and execute it. There are no intermediate compile and link steps as there are for languages such as C or C++. Python executes pro¬grams immediately. Python code is much more clearly defined and visible to the eyes. So, programs written in Python are easily readable and understandable. (b) Easy-to-maintain: Python is successful as its source code is fairly easy-to-maintain. It can be used as a scripting language or can be compiled to byte-code for building large applications. (c) A Wide Standard Library: One of Python’s greatest strengths is the availability of the bulk of the library with add-on modules present. It is very portable and cross-platform i.e., compatible with UNIX, Windows, and Macintosh. (d) Interactive Mode: It supports an interactive mode in which you can enter results from a terminal right to the program, allowing interactive…

Python Programming - Joining And Splitting

Python Programming – Joining And Splitting

Python Programming – Joining And Splitting Joining(concatenation) of arrays means combining multiple arrays into one and splitting of arrays means splitting one array into many. Concatenation, or joining of two arrays in NumPy, is primarily accomplished using the routines np. concatenate, np.stack, and np.stack. np. concatenate takes a tuple or list of arrays as its first argument. Example Demo of concatenation. # Concatenation import numpy as np x = np.array([1, 2, 3]) y = np.array([5, 6, 7]) z=np.concatenate([x, y]) print(z)RUN >>> [1 2 3 5 6 7] >>> Python Programming – Introduction To Numpy Python Programming – Arithmetic Operations On Array Python Programming – Array Creation You can also concatenate more than two arrays at once. In addition to the concatenation function, Numpy also offers two convenient functions stack(horizontal stack) and stack(vertical stack) which allows you to concatenate two multi-dimensional arrays vertically or horizontally. (See Figure 13.24). Example Demo of vstack and hstack functions. import numpy as np a = np.array([[1,2,30], [10,15,4]]) b = np.array([[1,2,3], 112, 19, 29]]) print(“Arrays vertically concatenated\n”,np.vstack((a,b))) print(“Arrays horizontally concatenated\n”,np.hstack((a,b)))RUN >>> Arrays vertically concatenated [ [ 1 2 30] [10 15 4] [12 3] [12 19 29] ] Arrays horizontally concatenated [ [ 1 2 30…

Python Programming - Installing Python

Python Programming – Installing Python

Python Programming – Installing Python Python distribution is available for a wide variety of platforms. You need to download only the binary code applicable to your platform and install Python. You need a C compiler to compile the source code manually if the binary code for your platform is not available. The installation of Python at various platforms like Unix and Linux is given as follows Unix and Linux Installation Here are the simple steps to install Python on Unix/Linux machine. Open a Web browser and go to http://www.pvthon.org/download/ as presented in Fig. 1.1. Follow the link to download the zipped source code available for Unix/Linux. Download and extract files. Edit the Modules/Setup file if you want to customize some options. run ./configure script ‘ make make install. This will install python in a standard location /usr/local/bin and its libraries dX/usr/local/lib/pythonXX where XX is the version of Python that you are using. Download and Install Python How to Install Django on Windows, Mac and Linux Using the Python Interpreter Windows Installation Here are the steps to install Python on a Windows machine. Open a Web browser and go to http://www.pvthon.org/download/ as shown in Fig 1.1. Follow the link for the…