[Python] Python File Keeps Running Previous Output

I am writing an interpreter that can understand English commands, for example, 'say Hello World.' The Python code reads input from stdin. I have no problem with that. Then it translates it into Python code and appends it to a file. Again, no problem. Then I have a function that runs the code in the file. The function goes like this:

def run(runfile):
with open(runfile,"r") as rnf:
exec(rnf.read())


Then I just write:

run("file.py")


I then run the code in the file and simulate the output. Then I open the file as if to write to it and then close it at the end of the program (on the last line) to delete the file's contents like this:

open("file.py", "w").close()


The problem is that when I type in English commands and run the file, it runs properly. Then I type in a different English command, and it runs the output from the previous execution. Then I run it again and it works properly. Why does this happen and how can I fix it? (Feel free to ask questions about my code)

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