Line Counter

Reading and Writing Files in Python

Line Counter

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Line Counter

One useful python script that you can now build is a script to count the number of lines in a file. In this part of the class, we will build a line counter using Google Colab notebook and the skills we have learned so far. I am not going to provide you witht he notebook as you should now have to work from.

Choosing a file

We are going to begin by exploring what files are available to us. In a new Colab notebook, use the ls command to see what available folders and files are in your working directory

  • !ls shows the folders and files in your current directory
  • %cd folder_name allows you to enter into a different directory that you are currently in!

After doing this myself, I had the following output. Yours should be similar if not exactly the same

Now that I know what is in my current folder, I am going to pick the file 'california_housing_test.csv'

Counting the lines in the file

Using the same code that we have used previously in this lecture, is it possible to count the number of lines in the file? Try it yourself, and my code is below!


# Function takes in the file name def count_lines(filename): # Initialize the count count = 0 # Open the file with open(filename,'r') as f: # Print each line for line in f: # add to count count += 1 f.close() return count # Call the function count_lines('california_housing_test.csv')
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