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Introduction to Python Timeit

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Working of timeit() Method with Example

This basic function is provided by the timeit library of Python for calculating the execution time of small Python code snippets. To calculate the accurate time of execution of the program by running the timeit method one million of time which is the default value.

The timeit module provides many different functions and the most important functions are timeit() which is for calculating the time of execution of program, repeat() function can be used with timeit() to call this timeit() function the number of times in the repeat is specified, and default_timer() this function is used to return the default time of the execution of the program.

Let us demonstrate these functions in the below examples along with syntax:

Timeit(): This is a very important and useful function provided by the timeitmodule to calculate the execution of a given python code. This timeit() function can be executed even in the command-line interface.

Let us see the syntax and example in the below section:

Syntax:

timeit.timeit(stmt, setup, timer, number)

Parameters:

stmt: This parameter is to measure the statement which you want and the default value is “pass”.

setup: This parameter is used to set the code that must be run before the stmt parameter and this also has a default value as “pass” and this parameter is mostly used for importing other code modules that are required for this code.

timer: This parameter is timeit object and it has its default value.

number: This parameter is used to specify the number which is used to mention how many executions you wish to run the stmt parameter. The default value of this parameter is 1 million (1000000).

The return value of this function timeit.timit() is in seconds which returns the value it took to execute the code snippets in seconds value.

Now we will see a simple example that uses timeit() function. The timeit() function uses parameter stmt which is used to specify the code snippets which we want to calculate the time of execution of the given code snippets in stmt. In this article, we can have stmt in a single line using single quotes or multiple lines using semicolon or triple quotes.

Example of Python Timeit

Below is an example of Python Timeit:

Code:

import timeit setup_arg = "import math" print("Program to demonstrate the timeit() function for single and multiline code") print("n") print("The single line code in stmt parameter is ") stmt1 = 'result = 9 * 6' print(stmt1) print("n") print("The multiple code statement using semicolons is given as follows:") stmt2 = 'p = 9;q = 6; product = p*q' print(stmt2) print("n") print("The multiple code statement using triple quotes is given as follows:") stmt3 = ''' def area_circle(): r = 3 res = chúng tôi * r * r ''' print(stmt3) print("n") print("The time taken to execute the above code statement 1 which uses semicolon is:") print(timeit.timeit(stmt1, number = 1000000), 'seconds') print("n") print("The time taken to execute the above code statement 2 which uses semicolon is:") print(timeit.timeit(stmt2, number = 1000000), 'seconds') print("n") print("The time taken to execute the above code statement 3 which uses trile quotes is:") print(timeit.timeit(setup= setup_arg, stmt = stmt3, number = 1000000), 'seconds') print("n")

In the above program, we saw how we used setup, stmt, and number arguments along with the statements which have one or more than one line of code in it. To write more than one line of code we have used a semicolon in stmt2 and we can also use triple quotes for writing multiple lines and we have written it in stmt3. Therefore the import statement required for stmt3 is assigned to the setup parameter of the timeit() function as this is used to execute the stmt value of the function and then it returns the time of the execution of statements after running number = 1000000 times.

In Python, timeitmodule provides timeit() function for calculating the execution time. Before using this function we should note some points we cannot use this function everywhere that means this is used only for small code snippets. It is better to use some other functions instead because timeit() function calculates the execution of code in seconds but what if the code is taking a few minutes to execute then this function will not be recommended. As we discussed above the time module used for calculating the execution of the program is not recommendable because it will also take some background time which may not give accurate time. This timeit() function has both command line interface as well as callable function.

Conclusion

In this article, we conclude that timeit module in Python provides timeit() function. This function is used for calculating the execution time of the given code statements. In this article, we saw a basic example and also we saw how the statements can be written using semicolons or triple quotes for single line statements and multiple lines of the program statements. We also saw examples for writing examples with timeit() function arguments such as setup, stmt, and number. This timeit() function is very useful than the time module as this will help to calculate the performance of the code easily and quickly. This timeit() function must be used only for the small code snippets as this is not much recommendable for lengthy code snippets as it returns the time in seconds.

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How Does The Place Method Work In Tkinter With Example?

Introduction to Tkinter place

Tkinter is used to create GUI in python, and it is the most commonly used library we have. By the use of it, we can create a GUI very easily and very fast. As the name suggests, it is used to specified someplace for the GUI component. Tkinter has many layout manager places is one of them. By the use of place, we can assign the size or position of the window. It is a geometry manager position widget we have in the Tkinter module.

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To make use of the place, we first need to import the Tkinter package into our program. We can use this to place buttons, labels, and many other GUI stuff to place them properly into the window. Now we will see the syntax to use this in our program;

Example:

place(relx = val, rely = val, anchor = VAL)

In order to use this, we need to pass three parameters inside it. Which are named as relax, rely and anchor to place our widgets on the screen. We can call this method on any widgets we have available in the Tkinter module to develop our GUI for users. Let’s see one practice syntax to understand it better see below;

button1.place(relx =1, rely =1, anchor = N)

Here we call this method on the button widget and place the variables here 1,1, and N to relax, rely, and anchor, respectively.

How does the place method work in Tkinter?

As of now, we know that we use a place to place our widgets on the window. Which can be relative or absolute position on the window. We have three different layouts available in Tkinter are named as place, pack, and grid. These all three are based on different positioning. The place is based on absolute positioning; we will discuss absolute positioning in details see below;

Absolute positioning: This can be termed as fixed positioning, not relative. Suppose we have some different sizes of our window that encapsulate all our widgets in the right position in the past. But suppose we want to resize our window in the future, so the widgets will not be moving from their position irrespective of the window size. Also, the size of every widget will be in pixels. This means the look and feel of the application will be different from one platform to another one, as we see in many web applications where it looks different on chrome, firefox, and other browsers. The same is the case is here the GUI will be different on Mac, Linux, and windows, and many more. By using this, we can place our widgets on the window like labels, buttons, text, etc. Now we will see one example of how to use this and how it internally works to place the widgets on the window. We will see one simple example that will be under stable by the beginners as well see below;

from tkinter import * parent = Tk() parent.geometry("150x150") button1.place(relx = 1, relay =1, anchor = N) mainloop() Constructor

As we have already seen, this takes different parameters like height, anchor, relx, rely, and so on. We will discuss these parameters more in detail see below;

Here is the syntax for its constructor see below;

place(relx = val, rely = val, anchor = VAL)

height: By using this parameter, we can specify the height in pixels.

width: By using this parameter, we can specify the width in pixels.

anchor: By using this parameter, we can specify the original position of the GUI component, or we can say widget on the window. It comes up with so many different options for positioning the widget like S, W, E, N, SW, WE, EN. This position will indicate the corners, and it also has one default position that is NW.

relax: This parameter represents the horizontal offset between 0.0. to 1.0.

relay: This parameter represents the vertical offset between 0.0. to 1.0.

Y: This is the vertical offset that comes in pixels.

X: This is the horizontal offset that comes in pixels.

Methods

We have some of the method available which can be used with the place which is as follows see below;

pack (): This method is used to format or positioning our GUI widgets in vertical and horizontal boxes.

grid (): As the name suggests, it can handle the list data and is defined as the method that manages to show the widgets in two-dimensional ways.

Example of Tkinter place

Example:

from tkinter import * parent = Tk() master.geometry("300x300") #label one creating l = Label(parent, text = "This is label one !!") l.place(relx = 1, rely = 1, anchor = NW) #label two creating l = Label(parent, text = "This is label two !!") l.place(relx = 1, rely = 1, anchor = CENTER) mainloop()

Output :

Conclusion

By using this place method, we can place our widgets on the GUI window. Bypassing various parameters to its constructor, we can place them at right, left top, and bottom. Also, we can place them at the corner of the window as well. But to use this, we would require the Tkinter module to be imported into our application.

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Learn The Working And Example Of Plsql Rowtype

Introduction to PLSQL rowtype

The definition of the columns or fields retrieved from the cursor table or cursor itself in PL/SQL is done using the attribute called %ROWTYPE. Each column or record in the field is considered to have its own datatype corresponding to the type of column it is declared as. The cursor variable name or cursor name is kept at the beginning at the prefix place if the %ROWTYPE attribute. In this article. We will study the syntax, working, and implementation of rowtype attributes in PL/ SQL. In this topic, we are going to learn about PLSQL rowtype.

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As the cursor name is prefixed while making the use of the ROWTYPE attribute, the syntax of the rowtype while using it in PL/ SQL is as shown below –

cursorRecord cursorName%ROWTYPE

In the above syntax, the terms used are as explained below –

cursorRecord – the cursorRecord is the value by which the record or field is identified.

curserName – The cursor name is the name of the cursor, which is declared explicitly in the current scope of the program.

Working of %ROWTYPE attribute

The cursor works as the pointer, which points to the individual field or record in the table. Whenever the usage of loops is done at that time, in order to refer to each of the individual records, we take the use of the sample cursor, which will store the temporary field to which we are currently referring. Thus, the complete record or the value of a single column can be pointed by the cursor.

Points to be considered

We can declare a variable in PL/ SQL as the name of the table%ROWTYPE datatype can prove very much helpful for data transferring between PL/SQL and tables of the database. The most important point here is that we can make the use of a single variable instead of multiple separate variables for each column of the database.

We don’t even need to have any idea regarding each of the columns of the table because instead of using the made-up variable names for each of the columns, we will be referring to each of the columns by using its real name. Thus, even if any of the changes are made in the structure of the table later on, which involves the addition and deletion of the columns from it, there will be no necessity to make any changes in the program or code that we have written.

We can refer to each of the individual fields of the record by making the use of dot symbol in the format name of the record. name of the field. Using this format, we can read and write one field at a time.

In order to assign all the fields value at once, we can make the use of one of the two mentioned methods below –

Aggregate assignment of all the records can be done in PL/ SQL in case if they refer to the same cursor or table.

SELECT or FETCH statements can be used to assign the list of values to a particular record. The order in which the names of the column are declared should be the same as they appear in the command. The selected and fetched items should have simple names, or if in case they are, expressions must have aliases if they are associated with %ROWTYPE.

Example of PLSQL rowtype Example #1 SELECT * FROM [customers_details];

The output of the execution of the above query statement is as shown below, showing the contents of the table customer details –

To retrieve the details of the table in such a way that each of the customer’s first name is retrieved and the contact details showing its mobile number is retrieved, we can create a procedure in PL/ SQL. In this procedure, we will make use of the cursor named sample cursor, which will point out all the resultset of the customer details table having its f_name and mobile number fields.

Further, we will loop through the result by rotating it in the loop where we will take each of the individual records of the cursor table contents one by one in a variable named sample variable. Then we will keep displaying the result in such a way that the DBMS output will contain the name and its corresponding mobile number with an in-between string attached as “having the mobile number”.

CREATE OR REPLACE PROCEDURE 2 IS CURSOR sampleCursor IS SELECT f_name, mobile_number FROM customers_details sampleVariable sampleCursor%ROWTYPE; BEGIN OPEN sampleCursor; LOOP FETCH sampleCursor INTO sampleVariable; EXIT WHEN sampleCursor%NOTFOUND; || sampleVariable.mobile_number ); END LOOP; CLOSE sampleCursor; END;

The output of the above code is as displayed below –

Example #2

Consider one more example where we have a table named Employees, which has the following contents in it when retrieved by using the query statement –

SELECT * FROM [Employees]

The execution of the above instruction gives the following output –

Now, in case if we want to retrieve all the data of the Employees table in such a way that it should display the first name and then the birth date in the format – firstname has his birthday on birthdate. For that thing, we can make the use of the following procedure –

CREATE OR REPLACE PROCEDURE 2 IS CURSOR sampleCursor IS SELECT FirstName, BirthDate FROM Employees sampleVariable sampleCursor%ROWTYPE; BEGIN OPEN sampleCursor; LOOP FETCH sampleCursor INTO sampleVariable; EXIT WHEN sampleCursor%NOTFOUND; || sampleVariable.BirthDate ); END LOOP; CLOSE sampleCursor; END;

The output of the above procedure is as shown below –

Conclusion

The use of the %ROWTYPE attribute in PL/ SQL is mostly used for referring and having a cursor pointer to the records, which can be columns of the particular table or even the complete fields record itself.

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Javascript Bind() Method With Practical Examples

In JavaScript, the bind() method is an effective way to create new functions with a bound ‘this’ value and, if needed, pre-set arguments.

Section 1: Setting the ‘this’ value for a function

One of the primary uses of the bind() method is to set the ‘this’ value of a function to a specific object without altering the original function. This is particularly useful when you want a function to work with a specific object but don’t want to modify the function itself.

Consider the following example:

In this example, we have a ‘studentA’ object with a ‘result()’ method that uses the ‘this’ keyword to refer to the object. We also have another object, ‘studentB’, with its own ‘name’ and ‘score’ properties. By calling the bind() method on ‘studentA.result()’, we pass in ‘studentB’ as the ‘this’ value, effectively binding it to ‘studentB’. When ‘boundResult()’ is called, the ‘this’ keyword in the function will refer to ‘studentB’ rather than ‘studentA’.

Section 2: Creating a function with pre-set arguments

The bind() method also allows you to create a new function with pre-set arguments. This can be useful when you need a function to always use specific arguments without altering the original function.

Let’s take a look at the example below:

function multiply(x, y) { return x * y; } const multiplyByFive = multiply.bind(null, 5); console.log(multiplyByFive(3)); console.log(multiplyByFive(4));

In this example, we have a ‘multiply()’ function that takes two arguments and returns their product. We then create a new function, ‘multiplyByFive()’, by calling bind() on ‘multiply()’. We pass ‘null’ as the ‘this’ value and ‘5’ as the first argument. This ensures that when ‘multiplyByFive()’ is called, it will always multiply the passed argument by 5, without needing to modify the original ‘multiply()’ function.

Section 3: Using bind() with event handlers

The bind() method can also be useful when working with event handlers, as it allows you to set the ‘this’ value within the handler function. This can be particularly helpful when using object methods as event handlers.

Consider the following example:

const buttonController = { button: document.getElementById('myButton'), console.log(this.message); }, init() { } }; buttonController.init(); Section 4: Partial application with bind()

The bind() method allows for partial application of arguments, enabling you to fix a certain number of arguments for a function, while leaving others to be passed in later. This can be helpful for creating more specialized versions of general functions.

Here’s an example:

function product(a, b, c) { return a * b * c; } const doubleProduct = product.bind(null, 2); console.log(doubleProduct(3, 4)); console.log(doubleProduct(5, 6));

In this example, we have a ‘product()’ function that takes three arguments and returns their product. We then create a new function, ‘doubleProduct()’, by calling bind() on ‘product()’ and fixing the first argument to ‘2’. This results in a new function that takes two arguments and calculates the product, always doubling the result.

Guide To Mysql Date_Add() With Example

Introduction to MySQL DATE_ADD()

DATE_ADD() function, as the name clearly states, it is a function that helps to alter the date and time in MySQL. This function updates and returns the date_time value per the arguments explicitly provided within the brackets. You can use most of the intervals available in MySQL to define the DATE_ADD() function. The function lets us add not just positive values but also negative values. The result can be a date_time value or a string per the provided arguments. You can use a dynamic function to update the date.

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Syntax

To use the DATE_ADD function, you need to provide both the date that will be modified and the interval argument. So the syntax will be like:

DATE_ADD (date_time, INTERVAL value AddUnit);

Description:

The ‘date_time’ represents the value or date and time that needs to be updated. You can define the interval within single quotes (“) or use a dynamic value like NOW().

The ‘value’ represents the quantity of minutes, days, hours, or years that you will add to the ‘date_time’. It means the time you want to add to the specified date and time.

The type of unit to be added is ‘AddUnit’. This specifies whether to add hours, minutes, seconds, days, or years. We can define a combination of units as well. Some examples of this are as follows:

SECOND

MINUTE

HOUR

DAY

WEEK

MONTH

QUARTER

YEAR

YEAR_MONTH

DAY_HOUR

DAY_MINUTE

DAY_SECOND

HOUR_MINUTE

HOUR_SECOND

MINUTE_SECOND

SECOND_MICROSECOND

Note that the value returned will either be a date and time or a string based on the above three arguments.

We can look into some examples to understand the working of the DATE_ADD() function.

How does DATE_ADD() function work in MySQL?

The working function is straightforward.

DATE_ADD (date_time, INTERVAL value AddUnit);

From this syntax, the function adds an interval of ‘value’ ‘AddUnits’ to ‘date_time’ and returns the updated date_time. Just keep in mind the date_time field is to follow the 24-hour clock. The keyword INTERVAL is mandatory in every statement.

Code #1

Let’s first see a dynamic value in the date_time field.

SELECT DATE_ADD(NOW(), INTERVAL 10 DAY) as date_time;

The function NOW() will return the current date and time in YYYY-MM-DD HH:MM: SS format. The output of this query will add 10 days to the current date_time.

Output:

Code #2

SELECT DATE_ADD('2023-01-10 10:00:00', INTERVAL 10 SECOND) as date_time;

So, We will update the date to 10 AM on 10th January 2023. We will add 10 seconds.

Output:

The output has come as 10 AM 10 seconds, of 10th January 2023.

Code #3

SELECT DATE_ADD('2023-01-10 10:00:00', INTERVAL 10 HOUR) as date_time;

So, the date to be updated here is 10 AM on 10th January 2023. We will add 10 hours.

Output:

The query says to add 10 hours to the date_time provided. So from 10 AM, 10 hours is added, making it the 8 PM same date.

We saw adding time frames to the date_time value. Let’s add a number of days to the same and check.

Code #4

SELECT DATE_ADD('2023-01-10', INTERVAL 10 DAY) as date_time;

So, the date to be updated here is 10 AM on 10th January 2023. We will add an interval of 10 days.

Output:

Adding ten days to the date_time will result at 10 AM on 20th January 2023—Cross-check with the calendar to confirm.

Code #5

SELECT DATE_ADD('2023-01-10 10:00:00', INTERVAL 10 WEEK) as date_time;

So, the date to be updated here is 10 AM on 10th January 2023. The interval to be added is ten weeks.

Here, the interval added is ten weeks. So the date will be shifted 10 weeks before 10th Jan 2023. Thus the expected output will be 20th March 2023—Cross-check with the calendar to confirm.

Code #6

SELECT DATE_ADD('2023-01-10 10:00:00', INTERVAL 10 YEAR) as date_time;

So, We will update the date to 10 AM on 10th January 2023. We will add an interval of 10 years.

Output:

When ten years are added to the 10th of January 2023, the expected result is 10 AM on the 10th of January 2030. We have added time and day units to the date_time field. Now let’s try adding a combination of these values.

Code #7

SELECT DATE_ADD('2023-01-10 10:00:00', INTERVAL '10:10' YEAR_MONTH) as date_time;

So, the date to be updated here is 10 AM on 10th January 2023. The interval to be added is a combination of years and months. Ten years and ten months are to be added to the date_time value.

Output:

Adding ten years and ten months to 10th January 2023 will return 10th November 2030. The time will remain untouched in this query.

Code #8

SELECT DATE_ADD('2023-01-10 10:00:00', INTERVAL '1:10' HOUR_MINUTE) as date_time;

So, We will update the date to 10 AM on 10th January 2023. You must add 1 hour and 10 minutes to the date_time value.

Output:

Let’s try adding negative values to this function.

Code #9

SELECT DATE_ADD('2023-01-10 10:00:00', INTERVAL -10 HOUR) as date_time;

The query is to subtract 10 hours from the date_time provided. In this date_time value, the date will remain unchanged, and the expected output will be 12 AM on the same date.

Output:

Code #10

SELECT DATE_ADD('2023-01-10 10:00:00', INTERVAL -10 DAY) as date_time;

So, 10 days are to be subtracted from 10th January 2023. And the time field is to remain untouched.

Output:

Moving 10 days backward in the calendar from 10th January 2023 will return 31st December 2023, and the time is to remain untouched.

Code #11

SELECT DATE_ADD('2023-01-10 10:00:00', INTERVAL '-60:-60' MINUTE_SECOND) as date_time;

The query directs us to subtract 60 minutes and 60 seconds from 10 AM on 10th January 2023.

Output:

By moving 60 minutes and 60 seconds backward to 10 AM, the expected result is 8:59 AM of the same day.

Advantage Conclusion

We are now familiar with the DATE_ADD function. The function will add a specified unit of time or days to the date and time value provided in the statement. You can add both positive and negative values to the date_time field. This function supports most of the units in MySQL. The query is straightforward to amend any date and time field and return the result.

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Learn The Example Of Angularjs Ng

Introduction to AngularJs ng-repeat

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How Angular CLI works?

In the AngularJS framework, it is very important to know that all the In-Built directives that the AngularJS framework has provisioned will always be denoted with ng. As soon as you declare the ng-repeat directive attribute in the HTML page of your AngularJS application, the Framework knows what has to be done as it’s inbuilt the definition is defined with AngularJS framework itself. Each time ng-repeat is invoked, it initializes a template for each object from the list/collection, and each template element has its own scope.

Each object can be referred to using the local variable defined in the ng-repeat tag. The ng-repeat should be used as an attribute inside any HTML tag such as div, paragraph, table, button, href, etc. To know the index of each object in the list and keep track of it, the track by $index property can be used. Tracking by some other id parameter (not $index) which is present inside the object can also be done using track by chúng tôi Along with $index, there are few more such properties defined by AngularJS which can be used with ng-repeat, such as

$first – Will return true if the object is the first object in the List

$last – Will return true if the object is the Last object in the List

$middle – Will return true if the object is in between the List

$odd – If the value of $index is an odd number, it will return true

$even – If the value of $index is an even number, it will return true

ng-init can also be used along with the ng-repeat directive, which can help you to add an additional parameter for each object in the list ONLY for that scope of the template instance.

While using ng-repeat, something to keep a note of is that any object starting with the $ symbol will not be read by the ng-repeat directive and get ignored as its AngularJS and $ is a prefix used by AngularJS for public or private properties.

Example:

Index.html

.grocery-list-class { margin-top: 20px; cursor: pointer; } .name { font-weight: bold; } .amt, .qunatity, .desc { font-weight: normal; } .amt { text-align:right; vertical-align: centre; color:blue; } h1 { text-align:center; color: orange; }

angular.module('myGroceryApp', []) .controller('GroceriesController', function($scope) { $scope.groceriesList = []; var grocery1 = {"name": "Olive Oil", "description": "The description of this oil", "amount": 154.50}; var grocery2 = {"name": "Whole Wheat Bread", "description": "The description of this Bread", "amount": 35}; var grocery3 = {"name": "Tomato Suace", "description": "The description of this Sauce", "amount": 50}; var grocery4 = {"name": "Brown Rice", "description": "The description of this Rice", "amount": 200}; var grocery5 = {"name": "Rose Water", "description": "The description of this Product", "amount": 55.75}; $scope.groceriesList.push(grocery1, grocery2, grocery3, grocery4, grocery5); });

In the above example, we are trying to display a list of groceries that have been added to the cart in tabular format on UI using the ng-repeat directive.

Make sure to include the AngularJS dependency in the Script tag so that you will be able to use the ng-repeat directive of AngularJS.

ng-repeat="grocery in groceriesList track by $index"

Here grocery is each object inside the groceries list, which is a list of all groceries in the cart. We have used a track by $index to keep track of each grocery inside the groceries list

ng-init="quantity = 1"

ng-init can be used to add any new parameter inside each grocery, and here we have added quantity to default to 1 for each grocery in the grocery list

Also, if we need to use the filter for filtering elements based on the amount or any other parameter, the filter can be used along with the ng-repeat directive and easily filter out the elements.

Just by using a few simple and easy CSS styling, we will be able to arrange the cart properly and view the contents on UI just like we want to below the output of the above code.

Conclusion

The ng-repeat directive in AngularJS is a very useful and one of the most widely used In-Built AngularJS directives, which are used to iterate through a list of elements and display the objects on the UI along with CSS styling, tracking by index and comes with a very little piece of code and easy to use and understand. Knowing the syntax is all that is needed, and you are ready to go. Filters can also be used with this ng-repeat directive to make it more efficient.

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