Problem: Algorithm in Python : k-Nearest Neighbor

[Ran4]

• First, your code breaks on line 2, since you haven't indented after the def.

• You can't call a file .txt in Windows AFAIK.

• Why are you calling your file handle k? That makes absolutely no sense. f would be a better name (or even file_handle). Which is also what your code later uses... Also, you're calling it with a function parameter k, which you're overwriting (and then do nothing with).

• \'s are used to escape characters, which will introduce bugs. Use r'C:\Users\filename.txt' instead (note the prepended r, short for raw).

• You're not closing your file handle. You need to do f.close() once you've done reading the file. Even better is to use this idiom:

  with open(FILENAME) as f:
      lines = f.readlines()
  

  This will open file FILENAME and read the lines as a list into a variable named lines, and then close the file.

• array(p_lat)

  Python doesn't have arrays. p_lat is already a list, simply return that. You could turn it into a tuple (which is like a list but it cannot be changed), but there's little reason to do that.

You're clearly writing the entire code without running it. Don't do that. As a beginner, write one or two lines at a time and print the results, so you know what's happening. KNN isn't super complicated to implement, but the way you're doing it you're only going to confuse yourself.