Simple Program In Python

Posted : admin | On 07-03-2021

< A Beginner's Python Tutorial

OK! We have Python installed, now what? Well, we program!

And it is that simple (at least for now!). Python makes it easy to run single lines of code—one-liner programs. Let's give it a go.

Python Programming Examples 1. Simple Python Programs. Python Programming Examples on Mathematical Functions. Python Programming Examples on Lists. Python Programming Examples on Strings. Python Programming Examples on Dictionary. Python Programming Examples on Sets. Nov 27, 2018 It is a very simple program that demonstrates how some things work in this programming language. Note that this is for users who have a basic understanding of python. Please note that these examples are written in Python 2, and may need some adjustment to run under Python 3. 1 line: Output. Print 'Hello, world!' # This program adds up integers in the command line import sys try: total = sum(int(arg) for arg in sys.argv[1:]). Python is a very simple language, and has a very straightforward syntax. It encourages programmers to program without boilerplate (prepared) code. The simplest directive in Python is the 'print' directive - it simply prints out a line (and also includes a newline, unlike in C). Learn Python programming with our simplified Python programming tutorial and examples. Python programming language was created by Guido Van Rossum. Because of its simplicity in coding and powerful features, it works brilliantly for both beginner to experts. Python - Basic Syntax First Python Program. Let us execute programs in different modes of programming. Python Identifiers. A Python identifier is a name used to identify a variable, function, class. Reserved Words. The following list shows the Python keywords. Lines and Indentation.

Opening IDLE[edit]

Run the program labelled IDLE (IDLE stands for Integrated Development Environment). Now you are in the IDLE environment. This is the place you will be spending most time in. Here you can open a new window to write a program, or you can simply mess around with single lines of code, which is what we are going to do.

Type the following line and press Enter. Don't type the >>> part, it will already be there. Also note that in Python 2 the parentheses are optional after print, but in Python 3.0 they are required.

Python Program to Make a Simple Calculator In this example you will learn to create a simple calculator that can add, subtract, multiply or divide depending upon the input from the user. To understand this example, you should have the knowledge of following Python programming topics.

Code Example 1: Hello, world!

What happened? You just created a program, that prints the words 'Hello, world!'. The IDLE environment that you are in immediately compiles whatever you have typed in. This is useful for testing things, e.g., defining a few variables, and then testing to see if a certain line will work. That will come in a later lesson though.

Math in Python[edit]

Now try the following examples. I've given explanations in parentheses.

Code Example 2 – Maths

As you see, there is the code, then the result of that code. I then explain them in brackets. These are the basic commands of Python, and what they do. Here is a table to clarify them.

Table 1 – Python operators
Command	Name	Example	Output
+	Addition	4 + 5	9
-	Subtraction	8 - 5	3
*	Multiplication	4 * 5	20
/	Division	19 / 3	6
%	Remainder (modulo)	19 % 3	1
**	Exponent	2 ** 4	16

Remember that thing called order of operations that they taught in maths? Well, it applies in Python, too. Here it is, if you need reminding:

parentheses ()
exponents **
multiplication *, division /, and remainder %
addition + and subtraction -

Order of Operations[edit]

Simple Palindrome Program In Python

Here are some examples that you might want to try, if you're rusty on this:

Code Example 3 – Order of operations

In the first example, the computer calculates 2 * 3 first, then adds 1 to it. This is because multiplication has the higher priority (at 3) and addition is below that (at a lowly 4).

In the second example, the computer calculates 1 + 2 first, then multiplies it by 3. This is because parentheses (brackets, like the ones that are surrounding this interluding text ;) ) have the higher priority (at 1), and addition comes in later than that.

Also remember that the math is calculated from left to right, unless you put in parentheses. The innermost parentheses are calculated first. Watch these examples:

Code Example 4 – Parentheses

In the first example, 4 - 40 is calculated, then - 3 is done.

In the second example, 40 - 3 is calculated, then it is subtracted from 4.

Comments, Please[edit]

The final thing you'll need to know to move on to multi-line programs is the comment. You should always add comments to code to show others who might be reading your code what you've done and why. Type the following (and yes, the output is shown):

Simple Interest Program In Python

Code Example 5 – Comments

A comment is a piece of code that is not run. In Python, you make something a comment by putting a hash (#) in front of it. A hash comments everything after it in the line, and nothing before it. So you could type this:

Code Example 6 – Comment examples

Comments are important for adding necessary information for another programmer to read, but not the computer; for example, an explanation of a section of code, saying what it does, or what is wrong with it. You can also comment out bits of code if you don't want them to compile, but can't delete them because you might need them later.

Simple program example

Here multiplication and adding operations have been used. The first line а = [1, 2, 3, 4, 5, 6, 7, 6, 5, 4, 3, 2, 1] reflects values for a parameter i in the second line (for i in a). If we set “1” instead of “i” for a parameter b we will see that “space” is multiplied for 12 and “very” is multiplied for “1”. So addition operator “+” unites 12 “spaces” and one word “very” which we can see in the first printed line. “for line in b: print line” is a cycle aimed at displaying required results. (source: writing service).

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Active7 years, 5 months ago

Possible Duplicate:
Python Simple Program

I am a new at programming and trying to learn python. I am trying to write a simple code but getting hard time.

so this is input text file

A 1 2 3 4

B 5 6 7 8

C 9 10 11 12

Can someone help me with how can I output element of second and third column corresponding to the element of first column which I will enter? In other words, how should I write a program so when I enter 'B' when programs asks me to enter a letter, program will out put '5' and '6' which are elements of second and third column corresponding to 'B'.

At least can someone give me some kind of hint on it, how can I approach this?

so far I have:

Community♦

user1251265user1251265

marked as duplicate by casperOneJun 21 '12 at 13:08

This question was marked as an exact duplicate of an existing question.

3 Answers

Please start with a beginner's tutorial such as the free http://learnpythonthehardway.org/book/

For your specific problem, are you wanting to draw that line graphically on the screen? If so, you'll need to work with a GUI toolkit of some sort as well. I prefer Qt, but other options such as GTK, wxPython and Tk are also viable. If you don't need to draw it, it's just a simple math problem.

Start with the tutorial and ask another more specific question when you have some code that's not working or a specific design problem that is troubling you.

Edit:

Here's some code based on what you provided to give you a basic structure to fill in

gfortunegfortune

The '2nd' and '3rd' elements, in python, are different than the '2nd' and '3rd' elements you speak of here. In python, there is the zeroth element, so the 'first' element of B is actually 6, not 5.

Yes, it's strange, but that's just how it is.