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We are doing a basic programmable script, so let’s just make it with integers, however, feel free to extend the same for decimals, long etc., We can also make comments. Whenever we find digit/s, we should allocate it to the token NUMBER and the number must be stored as an integer. This can be defined by the regular expression \”.*?\”. STRING tokens are string values and are bounded by quotation marks(” “). Then we also create the basic literals like ‘=’, ‘+’ etc., NAME tokens are basically names of variables, which can be defined by the regular expression *. In any programming language, there will be space between two characters. Thus we will need some basic tokens such as NAME, NUMBER, STRING. Let’s make a compiler that makes simple arithmetic operations. Now let’s build a class BasicLexer which extends the Lexer class from SLY. How to print without newline in Python?.How to assign values to variables in Python and other languages.Statement, Indentation and Comment in Python.Important differences between Python 2.x and Python 3.x with examples.Vulnerability in input() function – Python 2.x.Python Input Methods for Competitive Programming.

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