This is a test.

MAIN.txt

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+List 1 = {5, 6, 7}
+B = 0
+For A = 1 To 5 Step 2
+Locate A, 1, A
+B += 1
+Next
+Locate 1, 1, 0
+For A = 1, 21, 1
+Locate A, 4, "D"
+Next

convert.py

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+import sys
+import os
+
+def rem_empty(data):
+    return [v for v in data if v]
+
+class PreprocessorError(ValueError):
+    pass
+
+def open_and_preprocess(path, name, main=False):
+    file = open(f"{path}/{name}", "r")
+    content = file.read()
+    defines = dict()
+
+    #take care of whitespaces
+    content_rem = rem_empty(content.split("\n"))
+    content = []
+    for line in content_rem:
+        content += [line.strip()]
+
+    #preprocessing
+    for line in content:
+        if line[0] == "#": #is process command
+            line_argv = rem_empty(line[1:].split(" "))
+            command = line_argv[0].lower()
+            if command == "name":
+                if main:
+                    global out_name
+                    out_name = line_argv[1]
+            elif command == "include":
+                open_and_preprocess(path, " ".join(line_argv[1:]))
+            elif command == "define":
+                defines[line_argv[1]] = " ".join(line_argv[2:])
+            else:
+                raise PreprocessorError(f"{command} preprocessor unknown")
+        else:
+            print(line)
+
+temp = open(".temp", "w")
+stdout = sys.stdout
+sys.stdout = temp
+path = "."
+name = "main.bc"
+out_name = None
+open_and_preprocess(path, name, main=True)
+sys.stdout = stdout
+temp.close()
+if not out_name:
+    raise PreprocessorError("#name <name> preprocessor missing")
+else:
+    os.replace(".temp", f"{out_name}.txt")

example.bc

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+#name EXAMPLE
+Locate 1, 1, 0
+#include test.bc

main.bc

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+#name MAIN
+#define test 20
+List 1 = {5, 6, 7}
+
+B = 0
+For A = 1 To 5 Step 2
+  Locate A, 1, A
+  B += 1
+Next
+
+#include example.bc

test.bc

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+For A = 1, 21, 1
+  Locate A, 4, "D"
+Next