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Hello and welcome to part two of creatine a calculator with Python.

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In this part we are going to focus on creatine all the buttons for the calculator.

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So we're going to create a function within that function will create the buttons for the calculator.

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So let's create a function that will be responsible for creating art buttons for the calculator.

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So to create a function you do D F space followed by the name.

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So I'm gonna call it create.

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I'm going to use this here.

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Create on the score

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widgets.

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So there will be widgets and I am going to passing self the self variable into that function and inside

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this function is where we define the various but the user input.

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He's going to be stored as an Entry widget.

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So inside this function this create function we are going to make reference to the Entry widget to save

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time I have had it some line of code here to the function that I created.

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So here we have got a reference to the Self Variable the user on the score input.

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We're setting this to a course to entry the.

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This refers to the Entry widget the Entry widget is basically used to accept single line text strings

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from a user.

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If you want to display multiple lines of text that can be edited then you need to use a text widget

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instead.

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If you want to display one or more lines of text that cannot be modified by the user then you should

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consider using a label widget.

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So here we're using an Entry widget to accept a single line text strings of input from the user.

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And here we pass on it.

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This is the background color beekeeper friends or background color.

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And this is a hex value and given it you don't have to use x value.

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You can just type in the color you want.

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If it's brown white enclose it in quotes and here we're referring to the border be these towns for border.

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So the default values usually impacts in pixels.

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So I'm setting the value here to twenty nine.

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So this will be the size of the border and the value is in picks.

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And here we insert in the width we're setting the width 2 4.

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So there is a difference between the inset width and the actual with the inset which basically is the

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width of the insertion cursor.

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So it references the height so it's height is determined by the tallest item in its line.

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The default values usually two pixels but offset it to four.

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And here that with the width basically refers to the width of the widget in characters not pixel value.

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And this usually mesh measured measured according to the current font size.

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And here we've got a reference to the font so the font I've specified to use is for dinner.

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When you specify values you need to enclose them in quotes.

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If they are text or string values and this 20 year refers to the size of the font bold means I want

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it to be bold.

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Here we've got a text variable here which I'm setting too close to the Self Variable the user input.

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And I'm using to justify here to justify its position to the right.

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And here we we are using a great method for the input.

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And this is a column spend for the greeting.

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And on the screen of the calculator we are setting a default value of zero.

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So the calculator will have zero on the screen as a default so I have now added a function a value here.

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This is for the button.

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So I've stopped.

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This is the code for the button here.

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So this is going to be the number seven button on the calculator.

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So this is a piece of code I've got for it.

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So here again we're referring to it as putting one dot self.

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This would be the variable set in that two equals two button.

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And inside the button method we've got reference to the BJP which is a background color.

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I've given it this has a background color.

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And that is the border have set the borders size to 12.

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Usually you will be in pixel values text.

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This is a text that will appear on the button.

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It will have number seven on it.

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This P A the X refers to external X padding.

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So this dimension is added to the left and the right outer or outside of the pages of the widget.

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So the dimensions you apply to the left and the right outside of the widget.

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So that's what you use for the EPA.

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So this is a value you have given it next to it.

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We've got Patty.

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Patty basically is for external y padding y.

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This refers to the padding on the x axis is Party Y refers to a padding on the y axis.

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So it's basically external padding and the dimension is added to padding above and below the widget.

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And here we've got the font set the value of the font to help Vertica and this size is 20 and up made

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a bold.

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Here we go.

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Command we said that to Lambda lump basically is an anonymous function.

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So it's a key word used to describe an anonymous function.

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So here we've got a self button to click.

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We've not defined this method yet but we are touching it to this here.

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So later once we create the button line break the once we write the function this for this button don't

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click.

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When someone clicks on the numbers number seven button it will fire off the logic inside this button

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dot click method.

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And here we have got a grid with row of to the row number.

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Basically this refers to the run number into which you want to insert the widget.

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So the counting starts from zero.

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And the default is the next high unnumbered of on occupied row.

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So it basically refers to where you want to insert the widget.

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I'm not said I want to insert it after the second row the column number basically refers to where you

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want the widget to be greeted where you want the grid to apply.

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This column here.

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OK.

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I've set it to equal to zero which is the default.

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I've also set the button here with a value of sticky sticky basically.

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This option determines how to distribute any extra space within the cell.

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That is not taken up or by the widget.

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So any extra space that the widget doesn't occupy is sorted out using this sticky.

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So it would distribute the extra spaces if you do not provide a sticky attribute the default behavior

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is to sent out the widget in the cell.

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So I've given it a valley of W. what that will do.

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It will stretch the widget both horizontally and vertically to feel the cell.

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So this button is the number seven all the rest of the buttons are going to be identical.

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So what I'm going to do I'm just going to copy this piece of code here and just change the relevant

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button number.

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So I've added the other buttons that the calculator would need.

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So this was what we did together.

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Number seven.

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So basically the code is the same all up don't just change the text number.

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So this will not be button number eight and this will be button number nine.

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This will be button number for this with button number five.

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This reporter number six.

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So let me scroll down so you can see the other buttons

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this is text but no one say this is 2 3.

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Patient Zero.

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This will be the addition button.

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This will be the subtraction button and this will be the multiplication button.

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And this is the division the division is used to division with a slash.

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That's how you identify division in Python.

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So you use slash most programming languages actually.

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He uses a slash to indicate a division and also of course the equals to button.

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So when you do the calculation that you want an equal stop button.

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So this is the equals two button here.

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And I've also got a club button which I'm calling I'm gonna have the text set as a C so you can clear

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what's on the screen.

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So that is all our buttons that we're going to need for the calculator.

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So that's it for this lecture.

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Thanks for watching.

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Bye for now.