Python: Parse string objects into python objects from a file

Question

I've got a .csv file and I need to get some information from it. If I open the file, I can see two lines in it, that says "data" and "notes", and I need to get the information that these two variables have.

When I open the .csv file, it shows these lines:

data = 
[0,1,2,3,4,5,3,2,3,4,5,]

notes = [{"text": "Hello", "position":(2,3)}, {"text": "Bye", "position":(4,5)}]

To open the file I use:

import csv

class A()
  def __init__(self):
    #Some stuff in here

  def get_data(self):
    file = open(self.file_name, "r")
    data = csv.reader(file, delimiter = "\t)
    rows = [row for row in data]

Now, to read the information in data, I just write:

    for line in row[1][0]:
      try:
        value_list = int(line)
        print value_list

      except ValueError:
        pass

And, with this I can create another list with these values and print it. Now, I need to read the data from "notes", as you can see, it is a list with dictionaries as elements. What I need to do, is to read the "position" element inside each dictionary and print it.

This is the code that I have:

   for notes in row[3][0]:
     if notes["position"]:
       print notes["position"]

But this, gives me this error: TypeError: string indices must be integers, not str

How can I access these elements of each dictionary and then print it? Hope you can help me.

This is the .csv file from where I am trying to get the information.

Well, it is. Is just that at the beginning it has one column only. After these lines, is a common .csv file. — Pablo Flores
– Pablo Flores, Commented Jun 9, 2016 at 21:08
@PabloFlores that is not the preferred way to use csv reader >> remove from class. It is not reccommded to have one function class. Use functions. — Merlin
– Merlin, Commented Jun 9, 2016 at 21:12

Natsukane · Accepted Answer · 2016-06-09 21:32:37Z

1

You can change the last part of your code to:

for note in eval(rows[3][0].strip("notes = ")):
    if note["position"]:
        print note["position"]

If you need the position to be an actual tuple instead of a string, you can change the last line to:

print tuple(note["position"])

answered Jun 9, 2016 at 21:32

Natsukane

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3 Comments

Pablo Flores Over a year ago

Thank you for your answer. Isn't "rows" a list? If it is, then strip will give me a syntax error. Isn't it?

Natsukane Over a year ago

@PabloFlores - It is, but rows[3][0] is a string, and that's what you're running strip on. Test the code, it works.

Pablo Flores Over a year ago

Thank you. You helped me a lot.

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