io.UnsupportedOperation: not writable, can't write to .py files

Using this code:

data = open("data.py")
for i, line in enumerate(data):
    if i == 7:
        data.write("test")

I get the following error and I don't know how to fix it.

Traceback (most recent call last):
  File "H:\py\Projects\osuGatcha\main.py", line 61, in <module>
    data.write("test")
io.UnsupportedOperation: not writable

source https://stackoverflow.com/questions/69728401/io-unsupportedoperation-not-writable-cant-write-to-py-files

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