Python 3 programming Tutorial: With Statement (opening a file)
python 3 programming Tutorial - How to: the with - as statement
Python's with statement explained and demonstrated.
Example on using the "with" - statement, when opening a file on the hard drive.
The tutorial shows how to open a file on your computer using the open() function in Python. First the most standard way is demonstrated by using the open() function on its own. When, the Python's 'with - statement is used in comparison with the open() function. Through this, it can be seen how the 'with' - statement simplifies working with particular objects. These objects need to provide two methods.
1. __enter__() method
2. __exit__() method
The 'with' - statement call both methods implicitly at different times. This is demonstrated in this video by creating a custom object which does define both of these methods. I can be seen when the 'with' - statement calls these methods and how their implementation can be used.
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