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Python: Parse a given CSV string and get the list of lists of string values

Python module: Exercise-3 with Solution

Write a Python program to parse a given CSV string and get the list of lists of string values. Use csv.reader

We will get a list of lists of string values after parsing a CSV formatted string where each list of strings represents a line. For example "x, y, z" will become [["x", "y", "z"]].

Sample Solution:

Python Code:

import csv
csv_string = """1,2,3
4,5,6
7,8,9
"""
print("Original string:")
print(csv_string)
lines = csv_string.splitlines()
print("List of CSV formatted strings:")
print(lines)
reader = csv.reader(lines)
parsed_csv = list(reader)
print("\nList representation of the CSV file:")
print(parsed_csv)

Sample Output: 

Original string:
1,2,3
4,5,6
7,8,9

List of CSV formatted strings:
['1,2,3', '4,5,6', '7,8,9']

List representation of the CSV file:
[['1', '2', '3'], ['4', '5', '6'], ['7', '8', '9']]

Flowchart:

Flowchart: Parse a given CSV string and get the list of lists of string values.

Python Code Editor:


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Previous: Write a Python program to count the number of lines in a given CSV file.
Next: Write a Python program to read the current line from a given CSV file.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m