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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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Next: Write a Python program to read the current line from a given CSV file.

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Python: Tips of the Day

For-else construct useful when searched for something and find it:

# For example assume that I need to search through a list and process each item until a flag item is found and 
# then stop processing. If the flag item is missing then an exception needs to be raised.

for i in mylist:
    if i == theflag:
        break
    process(i)
else:
    raise ValueError("List argument missing terminal flag.")