Schwartz 1.3.1 – Template-based graphics code generator. October 23, 2015 Schwartz is a developer tool that takes the pain out of writing complex graphics-drawing code. The best fonts from well-known Disney films as Mickey Mouse, Alicia, Nemo, Lion King, Tron, Inside Out. Ready to personalize and share in Facebook and Twitter. The code will automatically be generated as you update the values. Copy and paste the code from the Generated HTML Code section into a text file. Save it with a.html extension (or other format if required). Need More Control? The above HTML generator is mainly used for putting together basic web pages with a heading and paragraph text.
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4.3.1. Dynamically Created Static Local Pages from Python¶
For the rest of this chapter, the example files will come from thewww directory under the main examples directory you unzipped. Iwill refer to example file there as “example www files”.
As the overview indicated, dynamic web applications typicallyinvolve getting input from a web page form, processing the inputin a program on the server, and displaying output to a web page.Introducing all these new ideas at once could be a lot to absorb,so this sectionuses familiar keyboard input into a regular Python programand then, like in the final version,processes the input and produces the final web page output. Balenaetcher 1 5 65 equals.
Follow this sequence of steps:
- Open the example www file
hello.html
in your browser, to see whatit looks like. - Change your browser view - for instance go back to the previouspage you displayed.
- Open the same hello.html file in Kompozer, if that works for you,or another editor that will show the html source, as discussed inHTML Source Markup.
- If using Kompozer, switch to the Source view (clicking the Source tab).Sometimes you will want to copy HTML text into a Python program.For instance, I selected and copied the entire contents of the
hello.html
source view and pasted it into a multi-line string inthe Python program shown and discussed below. - Careful, note the change from past practice here: Start Pythonfrom inside the www directory. In Windows you may start Idle withthe IdleOnWindows shortcutthat I placed in the www directory, not the original exampledirectory.
- Open the www example program
helloWeb1.py
in an Idleedit window. - Run it.
You should see a familiar web page appear in yourdefault browser (possibly not the one you have been using). Thisis obviously not a very necessary program, since you can selectthis page directly in your browser! Still, one step at a time: itillustrates several useful points. The program is copied below.Read it:
This program encapsulates two basic operations into the last twofunctions that will be used over and over. The first,
strToFile
, has nothing new, it just puts specified text in afile with a specified name. The second, browseLocal
, does more.It takes specified text (presumably a web page), puts it in a file,and directly displays the file in your default web browser. It uses theopen
function from the webbrowser
module to start the newpage in your web browser.The open function here requires the name of afile or URL. Since the page is automatically generated by the programfor one-time immediate viewing, it automatically usesthe same throwaway filename,
tempBrowseLocal.html
specified as the default in the keyword parameter. If youreally want another specific, name you could pass it as a parameter.In this particular program the text that goes in the file is justcopied from the literal string named
contents
in the program.This is no advance over just opening the file in the browserdirectly! Still, it is a start towards the aim of creating webcontent dynamically.
An early example in this tutorial displayed the fixed
HelloWorld!'
to the screen. This was later modified inhello_you4.py
to incorporate user input using the string formatmethod of Dictionaries and String Formatting,Schwartz 1 5 3 – Template Based Graphics Code Generator Free
Similarly, I can turn the web page contents into a format string,and insert user data. Load and run the www example program
helloWeb2.py
.The simple changes from
helloWeb1.py
are marked at thebeginning of the file and shown below. I modified the web page textto contain ‘Hello, {person}!’ in place of ‘Hello, World!’,making the string into a format string, which I renamed to themore appropriate pageTemplate
. The changed initial portion withthe literal string and and the main program then becomesNow the line 4k stogram 2 6 6 – download instagram photos download.
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incorporaties the person’s name into the contents for the web pagebefore saving it to a file and displaying it.
In this case, I stored the literal format string inside the Pythonprogram, but consider a different approach:
Load and run the www example program
helloWeb3.py
. It behavesexactly like helloWeb2.py, but is slightly different internally -it does not directly contain the web page template string. Insteadthe web page template string is read from the filehelloTemplate.html
.Below is the beginning of helloWeb3.py, showing the only newfunctions. The first,
fileToStr
, will be a standard functionused in the future. It is the inverse of strToFile
.The main program obtains the input. In this simple example, theinput is used directly, with little further processing. It isinserted into the web page, using the file
helloTemplate.html
as a format string.Although
helloTemplate.html
is not intended to be viewed by theuser (being a template), you should open it in a browser or web editor(Kompozer or ..) to look at it. It is legal to create a web page in a webpage editor with expressions in braces embedded in it! If you lookin the source view in Kompozer or in a web source editor,you will see something similar tothe literal string in helloWeb2.py, except the lines are broken updifferently. (This makes no difference in the formatted result,since in html, all white space is considered the same.)Back in the Normal mode in Kompozer, or in source mode for any html editor, add anextra line of text right after the line “Hello, {person}!”.Then save the file again (under the samename). Run the program
helloWeb3.py
again, and see that youhave been able to change the appearance of the output withoutchanging the Python program itself. That is the aim of using thetemplate html page, allowing the web output formatting to bemanaged mostly independently from the Python program.A more complicated but much more common situation is where theinput data is processed and transformed into results somehow, andthese results, often along with some of the original input, areembedded in the output web page that is produced.
As a simple example, load and run the www example program
additionWeb.py
, which uses the template fileadditionTemplate.html
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The aim in the end of this chapter is to have user input come froma form on the web rather than the keyboard on a local machine, butin either case the input is still transformed into results and allembedded in a web page. To make parts easily reusable, I obtainthe input in a distinct place from where the input isprocessed. In keeping with the later situation with web forms,all input is of string type (using keyboard
input
for now).Look at the program. You will see only a few new lines! Because ofthe modular design, most of the program is composed of recentstandard functions reused.
The only new code is at the beginning and is shown here: Polarr photo editor 2 0 0 download free.
The input is obtained (via
input
for now), and it is processedinto a web page string, and as a separate step it is displayed in alocal web page.Schwartz 1 5 3 – Template Based Graphics Code Generator No Human
There are a few things to note:
- All input is strings. Before the numerical calculations, thedigit strings must be converted to integers.
- I do calculate (a very simple!) result and use it in the outputweb page.
- Although it is not in the Python code, an important part of theresult comes from the web page format string inadditionTemplate.html, which includes the needed variable names inbraces, {num1}, {num2}, and {total}. View it in your browseror in a web editor.
When you write your own code, you might modify
additionWeb.py
,or you can start from a stripped down skeleton in the example www folder,skeletonForWeb.py
, with comments about whereto insert your special code.We will examine the bottom part of the following diagram later.The top part outlines the flow of data from string input toweb page in your browser for a regular Python program likewhat we have been describing, with the processing outlined in themiddle line. The parts in the middle will be common to the laterclient/server program, that manges input and output with the bottom line,that we will discuss later.
Again, this last section was somewhat artificial. You are not in the endlikely to find such programs practical as end products. Howeversuch programs are reasonable to write and test and they include almost allthe code you will need for a more practical (but harder to debug)CGI program, coming next..
4.3.1.1. Quotient Web Exercise¶
* Save
additionWeb.py
or skeletonForWeb.py
asquotientWeb.py
. Modify it todisplay the results of a division problem in a web page.As in the exercises in Chapter 1, display a full sentencelabeling the initial data and both the integer quotient and the remainder.You cantake your calculations from Quotient String Return Exercise.You shouldonly need to make Python changes to the processInput
andmain
functions. You will also need the HTML for the output pagedisplayed. Make a web page template file calledquotientTemplate.html
and read it into your program.Turn in both quotientWeb.py
and quotientTemplate.html
.