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How to Create a Simplistic Sub Language with Python

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Many Python programmers start out trying to use the JSON python library or just writing text to a file to transfer data between files. In this article I will cover the basics of creating a sub-language(not a full programming language), with little-to-no syntax, just perfect for writing small data bases or save files.

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EditSteps

  1. 1
    Download Python if you haven't already. Get some basic knowledge on Python first. Open up IDLE and create a new file named whatever you want.
  2. 2
    Create a 'Load' function, which will be used to load the file so the user can write and get data from the loaded file
    • Add a parameter, the file name(fname) to the function, then create two globals: file and ln. Then set file to open the file (open(fname, "r+"), r+ stands for Read and write. Set ln to be file.readlines() so we can access to all the lines in the file. Lastly return file
  3. 3
    Create a 'var' function, which will be used to get variables from the file and into python itself
    • Add a parameter, the line to scan(line) to the function, then get our previous globals. Set the variable 'text' to be ln[line](Gets the value of line line and saves it as text. Now return text
  4. 4
    Create a 'write' function, which will be used to add data to our file(since we've already can retrieve data from a loaded file)
    • Add a parameter, the value to write in the file, get the global file and seek (file.seek(0, 2) to the end of the file then add file.write("\n%s"%value)(Which writes a newline, then the value to the file).Return file
  5. 5
    Create a 'end' function, which will be used to save the file and close it so we can access a different file.
    • Get the global file and file.close() it, then return file

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