OLPyBASIC

Python with line numbers (Ordered List Python BASIC (Beginners’ All-purpose Symbolic Instruction Code)) is a new programming language with goto. Syntax and features will change without prior notice.

There are numbers before each line and the code runs in order, but execution can jump using goto or gosub with return. For each numbered line it uses Python’s exec() function. That means it’s compatible with Python3 or MicroPython in each logical line. OLPyBASIC has the advantage that you can have tutorials where you add lines to the program. It will also be easy to implement single stepping and continue after stop. Another advantage is that you can run spaghetti code in Python. This means that you can easily convert old BASIC programs to run in a modern programming language that normally lacks goto. This buys you time while you try to figure out how to remove the gotos, or leave them in, if your customer accepts that. Gosubs are easy to replace with functions.

Example input (no need to input comments after #):

from olpybasic import *
P('10 print("OLPyBASIC")') # P is short for put.
run() # Run i.e. start program.
P('20 print("uPython")') # If difficult to enter single quote, try P(input())
run()
P('30 x=30')
P('40 print(x)')
run()
P('50 x+=1')
P('60 if x<=40:goto(40)')
run()
PM() # PM is short for paste mode
70 stop()
90 print(11*x)
99 ret()
45 gosub(90) # Enter empty line to quit paste mode.

run()
L() # L is short for list.
d(50) # D is short for delete.
L()
P('50 x+=2')
L()
tron() # trace on
run()
troff() # trace off
run()

Please create issues on GitHub if you have bug reports, suggestions for e.g. code improvements (I’m a Python/MicroPython beginner), or feature requests. This should be very light weight, but also comfortable to use.

https://github.com/mobluse/olpybasic

Planned changes: for loops added?