Note: It's always good practice to close a file object resource, but it's a task that's easy to forget.
#1 OF A KINE CODE#
Once you have written or read all of the desired data in a file object, you need to close the file so that resources can be reallocated on the operating system that the code is running on. Open an existing file for appending plain text The most common modes are listed in the table below, with the default being 'r' for reading: The second (optional) parameter is also a string, and it specifies the mode of interaction you intend to be used on the file object being returned by the function call. We will be focusing on two arguments, with the first being a positional string parameter representing the path to the file you want to open. Here's how you can use it to open a file: fp = open( 'path/to/file.txt', 'r')Īs demonstrated above, the open() function takes in multiple arguments. The built-in open() function is what you use to open a file object for either reading or writing purposes.
Python is a great general purpose programming language, and it has a number of very useful file IO functionality in its standard library of built-in functions and modules.
#1 OF A KINE HOW TO#
Throughout this article we'll be covering a number of code examples that demonstrate how to read files line by line. While it's up to you to determine a suitable size for the chunks of data you're processing, for many applications it's suitable to process a file one line at a time.
What do you do when the file you are trying to process is quite large, like several GB of data or larger? The answer to this problem is to read in chunks of a file at a time, process it, then free it from memory so you can process another chunk, until the whole massive file has been processed. A common task in programming is opening a file and parsing its contents.
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