File Input and Output
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File Input/Output
Lesson 1 of 1
- 1Until now, the Python code you’ve been writing comes from one source and only goes to one place: you type it in at the keyboard and its results are displayed in the console. But what if you want to…
- 2Let’s walk through the process of writing to a file one step at a time. The first code that you saw executed in the previous exercise was this: f = open(“output.txt”, “w”) This told Python to o…
- 5What if we want to read from a file line by line, rather than pulling the entire file in at once. Thankfully, Python includes a .readline() method that does exactly that. If you open a file and ca…
- 6We keep telling you that you always need to close your files after you’re done writing to them. Here’s why! During the I/O process, data is buffered: this means that it is held in a temporary lo…
- 7Programming is all about getting the computer to do the work. Is there a way to get Python to automatically close our files for us? Of course there is. This is Python. You may not know this, but …
- 8It worked! Our Python program successfully wrote to text.txt.
- 9Finally, we’ll want a way to test whether a file we’ve opened is closed. Sometimes we’ll have a lot of file objects open, and if we’re not careful, they won’t all be closed. How can we test this? …
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