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Authors:
Tony Gaddis
Chapter:
Files And Exceptions
Exercise:
Checkpoint
Question:7 | ISBN:9780132576376 | Edition: 2

Question

If a file already exists what happens to it if you try to open it as an output file (using the 'w' mode)?

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Answer

If a file already exists and you try to open it as an output file using the 'w' mode, the following will happen:

  1. If the file exists and can be opened successfully in write mode ('w'), its content will be truncated or completely erased. This means that all the existing data in the file will be removed, and the file will become empty.

  2. If the file does not exist, a new file will be created with the specified name. This new file will be opened in write mode ('w') for writing data.

In summary, when you open a file in write mode ('w'), it will either erase the existing content of the file if it already exists, or create a new empty file if it doesn't exist. Therefore, it's important to exercise caution when using 'w' mode to prevent unintentional loss of data in the existing file. If you want to append data to an existing file without overwriting its content, you should use the 'a' (append) mode instead.

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