


How to Read a Text File into a Python List or Array
When dealing with textual data, it is often necessary to organize the information into a list or array for further processing. Python provides various methods to achieve this, as demonstrated in response to this frequently asked question.
Using readlines() and split()
The given code properly reads the text file using readlines() but fails to partition the data into individual elements. To rectify this, the split() function can be employed. The corrected code:
<code class="python">text_file = open("filename.dat", "r") lines = text_file.read().split(',') print(lines) print(len(lines)) text_file.close()</code>
This modification splits the entire string into a list of individual values, ensuring proper access to each item.
Using CSV Module
Alternatively, Python's CSV module provides a more streamlined approach for reading text files:
<code class="python">import csv with open('filename.csv', 'r') as fd: reader = csv.reader(fd) for row in reader: # Process the row data here</code>
This method automatically splits each line into a list based on the delimiter specified in the reader() function. The for loop allows individual rows to be accessed and processed.
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