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# Key Takeaways So Far

So far, you've learned reading and writing files and exception handling.

Before moving on to modules and packages, let's review the key points card by card.

`open()` opens a file, with the mode ("r", "w", "a") specifying read/write/append. read() reads the contents of an opened file.

Key Takeaways So Far

Which function is used to open a file in Python?