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>Hello everyone! Welcome back.......... >
>We are going to learn the python programming language, which is very useful
from the future point of view. >
>For Windows- Download python from-
target="_blank"
>Download Python > >
>For Linux- Python is already installed on Linux. >
>We will install an Anaconda navigator, you can use the different tools
also like pycharm and vs code. >
>Download and install anaconda for windows/Linux-
target="_blank"
>www.anaconda.com > >
>After this installation open anaconda navigator and select jupyter
notebook >
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Just click on python 3 as a new file
So let's get started.
Course content:
>Arithmetic Operators. >
>Relational Operators. >
Logical Operators.
>User input and output >
Control structure.
>What are the operators and expressions? >
>A simple example of an expression is 2+3. >
>
expression. >
>
Operators are functions that do something and can be represented by
symbols such as "+" or particular keywords.
Operators require some data to operate on, and such data is called
operands.
Arithmetic Operators:
( plus +)- Adds two objects.
( minus -)Gives the subtraction of one number from the other; If the
first operand is absent, it is considered zero.
( multiply *)- Gives the multiplication of two numbers or can return the
string multiple times.
>( power **)- Returns x to the power of y. >
( divide /)- divide x by y.
>( floor division //)- Returns the integer parts of the quotient. >
>( modulo %)- Returns the remainder of the division. >
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Relational Operators:
( less than <)- Returns whether x is less than y. All comparison
operators return True and
False.
Note - Capitalization of these names (
True and False ). Comparison can be
chained arbitrarily.
>( grater than >)- Returns whether x is more significant than
y. >
( less than or equal to <=)- Returns whether x is less than or equal
to y.
( greater than or equal to >=)- Returns whether x is greater than or
equal to y.
>( equal to = = )- Compares if the objects are equal. >
>( not equal to !=)- Compares if the objects are not equal. >
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Logical Operators:
not ( boolean not)- If x is
True it returns
False. If x is
False it returns
True.
or ( boolean or)- If x is > True, >
it returns True, else it
returns the evaluation of y.
and ( boolean and)- x and y return
false, else it returns the
evaluation of y.
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>
User input and output:
This is a specific topic and easy to understand. Just see the below
example.
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Control Statements :
Control Statements
Conditional Statements
- If statement
- If ------ else statement
- If ------ elif statement
Looping Statements
- For loop
- While loop
Loop Control Statements
- Break Statement
- Continue Statement
- Pass Statement
Conditional Statements:
Decision-making is the anticipation of conditions occurring while
executing the program and specifying actions taken according to the
conditions.
Decision structures evaluate multiple expressions which produce
True or
False as the outcome. We need to
determine which action to take and which statements to execute if the
outcome is True or
False otherwise.
The general form of a typical decision-making structure found in most
of the programming languages is given here.
Python programming language assumes any non-zero and non-null values
as True, and if it is either zero
or null, then it is assumed as
False value.
An if statement consists of a Boolean expression followed by one or
more statements.
It is similar to that of other languages. The if statement contains a
logical expression using which data are compared, and a decision is
made based on the comparison result.
If the Boolean expression evaluates to True, then the block of a
statement(s) inside the if statement is executed. If the Boolean
expression evaluates to False, then the first code set after the end
of the if statement(s) is executed.
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An if statement can be followed by an optional statement, which executes
when the Boolean expression is False.
An else statement can be combined with an if statement. An else
statement contains the block of code that executes if the conditional
expression in the if statement resolves to 0 or a False value.
The else statement is an optional statement, and there could be only one
else statement following if.
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The elif statement allows one to check multiple expressions for True and
execute a block of code as soon as one of the conditions evaluates to
True.
Similar to the else, the elif statement is optional. However, there can
be at most one statement; there can be an arbitrary number of elif
statements following an if.
Core Python does not provide a switch or case statements like other
languages, but we can use if...elif statements to simulate switch cases.
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Looping Statement
In general, statements are executed sequentially. The first statement in
a program is executed first, followed by the second, and so on. There
may be a situation when one needs to execute a block of code several
times.
Python Programming language provides various control structures that
allow for more complicated execution paths.
A loop statement allows us to execute a statement or group of statements
multiple times.
>
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A while loop statement in Python programming language repeatedly
executes a target statement as long as a given condition is
True.
Here, statement(s) may be a single statement, or a block of
statements. The condition may be any expression, and
True is any non-zero value.
The loop iterates while the condition is
True. When the condition becomes
False, program control passes
to the line immediately following the loop.
In Python, all the statements indented by the same number of character
spaces after the programming construct are considered part of a
single block of code. Python uses indentation as its method of
grouping statements.
>The critical point of the while loop is that the loop might not ever
run. When the condition is tested and the result is
False, the loop body will be
skipped, and the first statement after
the while loop will be executed.
A loop becomes an infinite loop if a condition never becomes
False. One must use caution when
using while loops because of the possibility that a given condition
never resolves to a False value.
This results in a loop that never ends. Such a loop is called an
infinite loop. An infinite loop might be helpful in client/server
programming, where the server needs to run continuously so that client
programs can communicate with it as and when required.
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Looping Statement: " For "
Executes a sequence of statements multiple times and abbreviates the
code that manages the loop variable.
It can iterate over the items of any sequence, such as a list or a
string. If a sequence contains an expression list, it is evaluated
first. Then, the first item in the sequence is assigned to the iterating
variable iterating_var. Next, the statements block is executed.
Each item in the list is assigned to iterating_var, and the statement(s)
block is executed until the entire sequence is exhausted.
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Nested Loops:
>One can use one or more loops inside any other for or while loop. >
Python programming language allows using one loop inside another loop.
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Terminates the loop statement and transfers execution to the statement
immediately following the loop.
The most common use for a break is when some external condition is
triggered, requiring a hasty exit from a loop.
>The break statement can be used in both whiles and for
loops. >
If we are using nested loops, the break statement stops the execution of
the innermost loop and starts executing the following line of code after
the block.
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Continous while loop:
With indefinite iteration, the number of times the loop is executed
isn't specified explicitly in advance.
Instead, the designated block is executed repeatedly as long as some
condition is met.
In the example given, the while loop will continuously execute until the
user enters 0.
>Here condition may be either True or any. >
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Causes the loop to skip the remainder of its body and immediately retest
its condition before reiterating.
It returns the control to the beginning of the loop. The continue
statement rejects all the remaining statements in the current loop
iteration and moves the control back to the top of the loop.
>The continue statement can be used in both whiles and for loops. >
>
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The pass statement in Python is used when a statement is
required syntactically, but you do not want any command or
code to execute. The pass statement is a null operation;
nothing happens when it executes.
The pass is also helpful in places where our code will eventually
go but has not been written yet (e.g., in stubs, for example)
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>
Using else statement with loops:
Python supports have an else statement associated with a loop statement.
If the else statement is used with a for loop, the else statement is
executed when the loop has exhausted iterating the list.
If the else statement is used with a while loop, the else statement is
executed when the condition becomes false.
If it encounters the break command in the loop, the other part will not
be called.
If it does not encounter the break command in the loop, the other part
will be called.
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difficulty, then comment below. > >
See you soon.
THANK YOU!
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