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Variables.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<title>PythonPythonME</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<p class="auto-style1">
<img alt="Logo" src="PythonPythonME.png" style="border-radius: 5px; width: 306px; height: 234px; background-color: #FFFFFF;" /></p>
<p class="auto-style3"><strong>Variables, expressions and statements</strong></p>
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<div id="tswcontent">
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<span class="auto-style14">
<p>The ability to manipulate variables is one of most powerful aspects
of a computer language. A variable is an identifier that makes reference
to a value.</p>
</span>
<p class="auto-style13"><strong>Assignment statements</strong></p>
<p class="auto-style15">An assignment statement declares a new variable
and assigns a value to it:</p>
<span class="auto-style5">
<p class="auto-style1">
<img alt="Assignment" src="images/Screenshot%202022-03-24%20190917.png" style="width: 287px; height: 125px" /></p>
<p class="auto-style16">
<iframe src="https://trinket.io/embed/python3/0becefe228?start=result&runMode=console" width="100%" height="356" frameborder="0" marginwidth="0" marginheight="0" allowfullscreen></iframe>
</p>
</span>
<p class="auto-style16"><span class="auto-style15" lang="en-in">T</span><span class="auto-style5"><span class="auto-style15">he
<span lang="en-in">first </span>assigns the (approximate) value of π to
pi<span lang="en-in">, while message has string value 'Hello there'</span></span>.</span></p>
<p class="auto-style17">On paper, start writing the name of the variable
followed by an arrow pointing to its value. </p>
<p class="auto-style18">
<img alt="pointer" src="images/New%20Project.png" style="width: 675px; height: 93px" /></p>
<p class="auto-style17">This type of diagram is<span lang="en-in">
</span>known as a state diagram since it depicts the state of the each
variable.</p>
<p class="auto-style17">Variable names could be as lengthy as you would
like them to be. </p>
<p class="auto-style17">They could include both letters and numbers, but
they should not begin with a number. </p>
<p class="auto-style17">Although it is legal to use uppercase letters,
it is common practice to use only lowercase letters for variable names. </p>
<p class="auto-style17">The underscore character, , can appear in a
name.<span lang="en-in"> If you give a variable an illegal name, you get
a syntax error: </span></p>
<p class="auto-style18">
<img alt="errors" src="images/Screenshot%202022-03-24%20193432.png" style="width: 302px; height: 123px" /></p>
<p class="auto-style17"><span lang="en-in">These errors arise due to :</span></p>
<ul>
<li>
<p class="auto-style17"><span lang="en-in">'</span>7<span lang="en-in">variable'</span>
is illegal because it begins with a number. </p>
</li>
<li>
<p class="auto-style17"><span lang="en-in">'</span>more@<span lang="en-in">'</span>
is illegal because it contains an illegal character, @<span lang="en-in">.
</span></p>
</li>
<li>
<p class="auto-style17"><span lang="en-in">'class' is one of
Python’s <strong>keywords</strong>.</span></p>
</li>
</ul>
<p class="auto-style17"><iframe src="https://trinket.io/embed/python3/daa47a9489?start=result&runMode=console" width="100%" height="356" frameborder="0" marginwidth="0" marginheight="0" allowfullscreen></iframe>
</p>
<p class="auto-style17">Python 3 has these keywords: </p>
<table align="center" style="width: 47%; height: 157px">
<tr class="auto-style20">
<td class="auto-style1" style="width: 72px"><strong>False</strong></td>
<td class="auto-style1" style="width: 67px"><strong>class</strong></td>
<td class="auto-style1" style="width: 70px"><strong>finally</strong></td>
<td class="auto-style1" style="width: 45px"><strong>is</strong></td>
<td class="auto-style1" style="width: 83px"><strong>return</strong></td>
<td class="auto-style1" style="width: 69px"><span lang="en-in">
<strong>None</strong></span></td>
<td class="auto-style1"><span lang="en-in"><strong>continue</strong></span></td>
</tr>
<tr>
<td class="auto-style21" style="width: 72px"><span lang="en-in">
<strong>for</strong></span></td>
<td class="auto-style1" style="width: 67px"><span lang="en-in">
<strong>lambda</strong></span></td>
<td class="auto-style1" style="width: 70px"><span lang="en-in">
<strong>try</strong></span></td>
<td class="auto-style1" style="width: 45px"><span lang="en-in">
<strong>True</strong></span></td>
<td class="auto-style1" style="width: 83px"><span lang="en-in">
<strong>
def</strong></span></td>
<td class="auto-style1" style="width: 69px"><span lang="en-in">
<strong>nonlocal</strong></span></td>
<td class="auto-style1"><span lang="en-in"><strong>while</strong></span></td>
</tr>
<tr>
<td class="auto-style21" style="width: 72px"><span lang="en-in">
<strong>and</strong></span></td>
<td class="auto-style1" style="width: 67px"><span lang="en-in">
<strong>del</strong></span></td>
<td class="auto-style1" style="width: 70px"><span lang="en-in">
<strong>global</strong></span></td>
<td class="auto-style1" style="width: 45px"><span lang="en-in">
<strong>not</strong></span></td>
<td class="auto-style1" style="width: 83px"><span lang="en-in">
<strong>with</strong></span></td>
<td class="auto-style1" style="width: 69px"><span lang="en-in">
<strong>assert</strong></span></td>
<td class="auto-style1"><span lang="en-in"><strong>else</strong></span></td>
</tr>
<tr>
<td class="auto-style21" style="width: 72px"><span lang="en-in">
<strong>import</strong></span></td>
<td class="auto-style1" style="width: 67px"><span lang="en-in">
<strong>as</strong></span></td>
<td class="auto-style1" style="width: 70px"><span lang="en-in">
<strong>elif</strong></span></td>
<td class="auto-style1" style="width: 45px"><span lang="en-in">
<strong>or</strong></span></td>
<td class="auto-style1" style="width: 83px"><span lang="en-in">
<strong>yield</strong></span></td>
<td class="auto-style1" style="width: 69px"><span lang="en-in">
<strong>pass</strong></span></td>
<td class="auto-style1"><span lang="en-in"><strong>expect</strong></span></td>
</tr>
<tr>
<td class="auto-style21" style="width: 72px"><span lang="en-in">
<strong>in</strong></span></td>
<td class="auto-style1" style="width: 67px"><span lang="en-in">
<strong>raise</strong></span></td>
<td class="auto-style1" style="width: 70px"><strong></strong></td>
<td class="auto-style1" style="width: 45px"><strong></strong></td>
<td class="auto-style1" style="width: 83px"><strong></strong></td>
<td class="auto-style1" style="width: 69px"><strong></strong></td>
<td class="auto-style1"><strong></strong></td>
</tr>
</table>
<p class="auto-style15">Keywords are usually represented in a different
color in most development environments. If you attempt to use one as
just a variable name, it will fail.</p>
<p class="auto-style13"><strong>Expressions and statements</strong></p>
<p class="auto-style15">A value, variable, and operator expression is
just a mixture of values, variables, and operators.</p>
<p class="auto-style15">When you enter an expression at the prompt, the
interpreter analyzes it, which implies it determines the expression's
value. Therefore in instance, the value of n is 17 and the value of n +
25 is 42.</p>
<p class="auto-style15"><iframe src="https://trinket.io/embed/python3/51c9c2703d?start=result&runMode=console" width="100%" height="356" frameborder="0" marginwidth="0" marginheight="0" allowfullscreen></iframe>
</p>
<p class="auto-style15">A statement is a piece of code that performs an
action, such as creating a variable or displaying a value.</p>
<p class="auto-style15"> </p>
<p class="auto-style18">
<img alt="Statement" src="images/Screenshot%202022-03-25%20113629.png" style="width: 122px; height: 62px" /></p>
<p class="auto-style18"> </p>
<p class="auto-style17">The very first line is just an assignment
statement which assigns a value to the variable n. The second line
contains a print statement showing the value of n.<span lang="en-in">
</span>Once you enter a statement, the interpreter executes it.</p>
<p class="auto-style23"><strong>Script mode</strong></p>
<p class="auto-style17">Python in interactive environment, which implies
you can interact with the interpreter directly. </p>
<p class="auto-style17">The interactive mode is a good starting point.</p>
<p class="auto-style17">Another option would be to save code in a script
file and then run the interpreter in script mode to execute the script. </p>
<p class="auto-style17">Python scripts are identified by names that
extension in '.py'.</p>
<p class="auto-style17"> </p>
<p class="auto-style18">
<img alt="Icon" src="images/python-file-icon-9.png" style="width: 250px; height: 265px" /></p>
<p class="auto-style18"> </p>
<p class="auto-style17"><span lang="en-in">As a demonstration, open
File>>New File or press Ctrl+N</span></p>
<p class="auto-style17"> </p>
<p class="auto-style18">
<img alt="1st" src="images/Screenshot%202022-03-25%20114934.png" style="width: 368px; height: 352px" /></p>
<p class="auto-style18"> </p>
<p class="auto-style17"><span lang="en-in">Create a program to display
'Hi there' message using a loop, and save it with the name Test.py, you
can choose any name but it must end with the extension '.py'.</span></p>
<p class="auto-style17"> </p>
<p class="auto-style18">
<img alt="2nd" src="images/Screenshot%202022-03-25%20115005.png" style="width: 351px; height: 138px" /></p>
<p class="auto-style18"> </p>
<p class="auto-style17"><span lang="en-in">Then run the program by
pressing Ctrl+F5 or Run>> Run Module F5</span></p>
<p class="auto-style17"> </p>
<p class="auto-style18">
<img alt="3rd" src="images/Screenshot%202022-03-25%20115024.png" style="width: 333px; height: 220px" /></p>
<p class="auto-style18"> </p>
<p class="auto-style17"><span lang="en-in">You will see the above as an
output message.</span></p>
<p class="auto-style23"><strong>Order of operations</strong></p>
<p class="auto-style17">While assessing sophisticated expressions such
as 5+2*4% 6-1 and 13 or 3, it is easy to be become confused about order
wherein the activities will be conducted.</p>
<p class="auto-style17"><span lang="en-in">T</span>he order of
evaluation is determined by the order of operations. Python adheres to
mathematical conventions when it comes to arithmetical operators. </p>
<p class="auto-style17">The <span lang="en-in">form of norms can be
remembered by the below tabulation</span>:</p>
<p class="auto-style17">
<table style="margin: 0px 0px 1.5em; padding: 0px; border: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-weight: 300; font-stretch: inherit; font-size: 0.875em; line-height: inherit; font-family: Georgia, Georgia, serif; vertical-align: baseline; border-collapse: collapse; border-spacing: 0px; width: 909.2px; text-align: center; color: rgb(68, 68, 68); letter-spacing: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">
<tbody style="margin: 0px; padding: 0px; border: 0px; font: inherit; vertical-align: baseline;">
<tr style="margin: 0px; padding: 0px; border: 0px; font: inherit; vertical-align: baseline;">
<td class="auto-style27" style="border-image: url('') initial;">
<strong><em>Operator</em></strong></td>
<td class="auto-style24" style="border-image: url('') initial;">
<strong><em>Description</em></strong></td>
</tr>
<tr class="alt" style="margin: 0px; padding: 0px; border: 0px; font: inherit; vertical-align: baseline; background: rgb(241, 241, 241);">
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<span class="auto-style15" style="border-style: none; border-color: inherit; border-width: 0px; margin: 0px; padding: 0px; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline;">
:=</span></td>
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<span class="auto-style15" style="border-style: none; border-color: inherit; border-width: 0px; margin: 0px; padding: 0px; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline;">
Assignment expression (Lowest precedence) </span></td>
</tr>
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lambda</span></td>
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Lambda expression</span></td>
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if-else</span></td>
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Conditional expression</span></td>
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or</span></td>
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Boolean OR</span></td>
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and</span></td>
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Boolean AND</span></td>
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not</span><span class="auto-style15"> </span><span class="auto-style15" style="border-style: none; border-color: inherit; border-width: 0px; margin: 0px; padding: 0px; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline;">x</span></td>
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Boolean NOT</span></td>
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<,<span> </span><=,<span> </span>>,<span> </span>>=, </span></td>
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Comparison operators</span></td>
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!=,<span> </span>==</span></td>
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Equality operators</span></td>
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in,<span> </span>not in,<span> </span>is,<span> </span>is
not,</span></td>
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Identity operators, membership operators</span></td>
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|</span></td>
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Bitwise OR</span></td>
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^</span></td>
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Bitwise XOR</span></td>
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&</span></td>
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Bitwise AND</span></td>
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<<,<span> </span>>></span></td>
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Left and right Shifts</span></td>
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+,<span> </span>–</span></td>
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Addition and subtraction</span></td>
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*,<span> </span>@,<span> </span>/,<span> </span>//,<span> </span>%</span></td>
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Multiplication, matrix multiplication, division, floor
division, remainder</span></td>
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+x,<span> </span>-x,<span> </span>~x</span></td>
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Unary plus, Unary minus, bitwise NOT</span></td>
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**</span></td>
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Exponentiation</span></td>
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<td class="auto-style25" style="border-bottom: 1px solid rgb(241, 241, 241); margin: 0px; padding: 5px; border-top-style: initial; border-right-style: initial; border-left-style: initial; border-top-color: initial; border-right-color: initial; border-left-color: initial; border-image: url('') initial; vertical-align: middle; border-left-width: 0px; border-right-width: 0px; border-top-width: 0px;">
<span class="auto-style15" style="border-style: none; border-color: inherit; border-width: 0px; margin: 0px; padding: 0px; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline;">
await</span><span class="auto-style15"> </span><span class="auto-style15" style="border-style: none; border-color: inherit; border-width: 0px; margin: 0px; padding: 0px; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline;">x</span></td>
<td class="auto-style1" style="border-bottom: 1px solid rgb(241, 241, 241); margin: 0px; padding: 5px; border-top-style: initial; border-right-style: initial; border-left-style: initial; border-top-color: initial; border-right-color: initial; border-left-color: initial; border-image: url('') initial; vertical-align: middle; border-left-width: 0px; border-right-width: 0px; border-top-width: 0px;">
<span class="auto-style15" style="border-style: none; border-color: inherit; border-width: 0px; margin: 0px; padding: 0px; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline;">
Await expression</span></td>
</tr>
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<span class="auto-style15" style="border-style: none; border-color: inherit; border-width: 0px; margin: 0px; padding: 0px; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline;">
x[index],<span> </span>x[index:index],<span> </span>x(arguments…),<span> </span>x.attribute</span></td>
<td class="auto-style1" style="border-bottom: 1px solid rgb(241, 241, 241); margin: 0px; padding: 5px; border-top-style: initial; border-right-style: initial; border-left-style: initial; border-top-color: initial; border-right-color: initial; border-left-color: initial; border-image: url('') initial; vertical-align: middle; border-left-width: 0px; border-right-width: 0px; border-top-width: 0px;">
<span class="auto-style15" style="border-style: none; border-color: inherit; border-width: 0px; margin: 0px; padding: 0px; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline;">
Subscription, slicing, call, attribute reference</span></td>
</tr>
<tr style="margin: 0px; padding: 0px; border: 0px; font: inherit; vertical-align: baseline;">
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<div class="auto-style1">
<span class="auto-style15" style="border-style: none; border-color: inherit; border-width: 0px; margin: 0px; padding: 0px; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline;">
(expressions…),<span> </span>[expressions…],</span></div>
<p style="overflow-wrap: break-word; margin: 0px 0px 1em; padding: 0px; border: 0px; font: inherit; vertical-align: baseline;">
</p>
<p class="auto-style1" style="overflow-wrap: break-word; margin: 0px 0px 1em; padding: 0px; border: 0px; font: inherit; vertical-align: baseline;">
<span class="auto-style15" style="border-style: none; border-color: inherit; border-width: 0px; margin: 0px; padding: 0px; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline;">
{key: value…},<span> </span>{expressions…}</span></p>
</td>
<td class="auto-style1" style="border-bottom: 1px solid rgb(241, 241, 241); margin: 0px; padding: 5px; border-top-style: initial; border-right-style: initial; border-left-style: initial; border-top-color: initial; border-right-color: initial; border-left-color: initial; border-image: url('') initial; vertical-align: middle; border-left-width: 0px; border-right-width: 0px; border-top-width: 0px;">
<span class="auto-style15" style="border-style: none; border-color: inherit; border-width: 0px; margin: 0px; padding: 0px; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline;">
Binding or parenthesized expression, list display,
dictionary display, set display</span></td>
</tr>
<tr class="alt" style="margin: 0px; padding: 0px; border: 0px; font: inherit; vertical-align: baseline; background: rgb(241, 241, 241);">
<td class="auto-style25" style="border-bottom: 1px solid rgb(241, 241, 241); margin: 0px; padding: 5px; border-top-style: initial; border-right-style: initial; border-left-style: initial; border-top-color: initial; border-right-color: initial; border-left-color: initial; border-image: url('') initial; vertical-align: middle; border-left-width: 0px; border-right-width: 0px; border-top-width: 0px;">
<span class="auto-style15" style="border-style: none; border-color: inherit; border-width: 0px; margin: 0px; padding: 0px; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline;">
()</span></td>
<td class="auto-style1" style="border-bottom: 1px solid rgb(241, 241, 241); margin: 0px; padding: 5px; border-top-style: initial; border-right-style: initial; border-left-style: initial; border-top-color: initial; border-right-color: initial; border-left-color: initial; border-image: url('') initial; vertical-align: middle; border-left-width: 0px; border-right-width: 0px; border-top-width: 0px;">
<span class="auto-style15" style="border-style: none; border-color: inherit; border-width: 0px; margin: 0px; padding: 0px; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline;">
Parentheses (Highest precedence)</span></td>
</tr>
</table>
</p>
<p class="auto-style23"><strong>String operations</strong></p>
<p class="auto-style17"><span lang="en-in">You can perform string
operations using * and + operators.</span></p>
<p class="auto-style17">String concatenation is performed by the +
operator, which joins strings by linking them end-to-end.</p>
<p class="auto-style17"><iframe src="https://trinket.io/embed/python3/63f14f0052?start=result&runMode=console" width="100%" height="356" frameborder="0" marginwidth="0" marginheight="0" allowfullscreen></iframe>
</p>
<p class="auto-style17">The * operator can also be used on strings to
conduct repetition. </p>
<p class="auto-style17">For instance, 'Spam'*3 becomes 'SpamSpamSpam'.
Another of the values must be a string, and another must be an integer.</p>
<p class="auto-style17"><iframe src="https://trinket.io/embed/python3/2e2460cc1f?start=result&runMode=console" width="100%" height="356" frameborder="0" marginwidth="0" marginheight="0" allowfullscreen></iframe>
</p>
<p class="auto-style17">We anticipate 'Spam'*3 to be much like
'Spam'+'Spam'+'Spam' as similar to 4*3 is equivalent to 4+4+4, and it
is.</p>
<p class="auto-style17"><span class="auto-style28" lang="en-in"><strong>
Comments</strong></span></p>
<p class="auto-style17">As projects grow in size and complexity, they
become more hard to read. </p>
<p class="auto-style18">
<img alt="Notes" src="images/meeting-notes_featured@2x.png" style="width: 340px; height: 252px" /></p>
<p class="auto-style17">As a result, it is a great idea to include note
cards in your programs that clarify what the program does in human
language. </p>
<p class="auto-style17">These memos are referred to as comments, and
they begin with the <strong># symbol</strong>:</p>
<p class="auto-style17"><iframe src="https://trinket.io/embed/python3/58b48c6440?start=result&runMode=console" width="100%" height="356" frameborder="0" marginwidth="0" marginheight="0" allowfullscreen></iframe>
</p>
<p class="auto-style17">Everything from the <span lang="en-in">'</span><strong>#</strong><span lang="en-in">'</span>
towards the end of the line is ignored and therefore has no impact on
the program's execution.<br />
<strong>Comments</strong> are most helpful when those who record
non-obvious code features. </p>
<p class="auto-style17">It is fair to presume that the viewer will be
capable of figuring out what the code does. It would be more important
to clarify why.</p>
<p class="auto-style17">Although <strong>appropriate variable names</strong>
could indeed <strong>reduce</strong> the need for comments, <strong>long
identities</strong> can make complex expressions hard to read, and there
is a tradeoff.</p>
<p class="auto-style23"><strong>Debugging</strong></p>
<p class="auto-style17">A program can contain three types of errors:
syntax errors, runtime errors, and semantic errors.</p>
<p class="auto-style18">
<img alt="Buggs" src="images/6911663_preview.png" style="width: 550px; height: 271px" /></p>
<ol>
<li>
<p class="auto-style17"><strong>Syntax error</strong><span lang="en-in">
here </span>refers to a program's framework and the rules governing
that structure</p>
</li>
<li>
<p class="auto-style17">The second type of error is a
<span lang="en-in"><strong>R</strong></span><strong>untime error</strong>,
so named because the error does not appear until the program has
begun to run.</p>
</li>
<li>
<p class="auto-style17"><strong>Semantic error</strong>: The third
type of error is "semantic," which means "meaning-related." If your
program contains a semantic error, this will run without generating
error messages, but will not do the right thing.</p>
</li>
</ol>
<p class="auto-style17"> </p>
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