Hello there! In this article we are going to create a programmer way to write an application. We will write an application using Python.

Ideation

So, as you all know that we have a specific format to write an application. In this post, I've chosen a leave application. Firstly, what we want is the sample of the application. Then, we are going to format the sample of the application with the important information. And at the end, we'll create a new file to output the text application and save it.

Prerequisites

A basic knowledge of file handling and string formatting.

The way I am going to make the program is using file handling in Python with string formatting. But you can also just make the use of string formatting to modify the program.

Firstly I saved a very raw and simple sample of application written in a file named, "letter.txt". I've used a simple format. Modify the file as per your requirements.

Note: Just keep the data that is to be changed with the application inside "{ }" brackets. And use a single unique word to define the information used inside it. We are going to change this information using string formatting

Now create a Python script file, say "letter.py" and start to code.

Coding

Firstly, we are using the template saved in our file, "letter.txt". So, we'll have to use it, open and read the content inside it. We are going to use the concept of file handling here.

In these two lines, I've opened the file, in read mode (because we don't want to modify the file) and then I've read the content inside the file using read function and stored it in a variable, text.

Now, we have got the format in the text variable. Now, just replace those reference variables written inside the "{ }" brackets with the required data.

We're going to make the user input the required data. So, let's make some variables to let the user input some data.

Note: I've used the same word references stored in the file inside "{ }" brackets. You can also do the same to remove any confusion.

Now, everything is well setup for us.

At last, We have to change the content in the text variable.

I've created a variable and then changed its content with the text content of text variable, using string formatting. And after that in the same variable I've replaced the references with the variables.

This is a bit complicated to see as I've combined two steps in one. But, just look at it once and you will get it easily. If not, separate the two steps and print them one by one and see the difference.

At the end, close the opened file, "letter.txt".

Now, you have created your application using python. Print the "temp_str" variable and see the output.

Here, we are going to make a new output file to save the application.

So, we'll again use the concept of file handling.

Congratulations! You have created a Python program to create your own application.

Code: