Python: Write dictionaries and a list of dictionaries to a given CSV file

Last update on April 02 2025 12:32:15 (UTC/GMT +8 hours)

7. Write CSV from Dictionaries

Write a Python program to write dictionaries and a list of dictionaries to a given CSV file. Use csv.reader

Sample Solution:

Python Code:

import csv
print("Write dictionaries to a CSV file:")
fw = open("test.csv", "w", newline='')
writer = csv.DictWriter(fw, fieldnames=["Name", "Class"])
writer.writeheader()
writer.writerow({"Name": "Jasmine Barrett", "Class": "V"})
writer.writerow({"Name": "Garry Watson", "Class": "V"})
writer.writerow({"Name": "Courtney Caldwell", "Class": "VI"})
fw.close()
fr = open("test.csv", "r")
csv = csv.reader(fr, delimiter = ",")
for row in csv:
  print(row) 
fr.close()

Sample Output:

Write dictionaries to a CSV file:
['Name', 'Class']
['Jasmine Barrett', 'V']
['Garry Watson', 'V']
['Courtney Caldwell', 'VI']

Flowchart:

import csv
print("\nWrite a list of dictionaries to a CSV file:")
fw = open("test1.csv", "w", newline='')
writer = csv.DictWriter(fw, fieldnames=["Name", "Class"])
writer.writeheader()
writer.writerows(
    [{"Name": "Jasmine Barrett", "Class": "V"},
    {"Name": "Garry Watson", "Class": "V"},
    {"Name": "Courtney Caldwell", "Class": "VI"}])
fw.close()
fr = open("test1.csv", "r")
csv = csv.reader(fr, delimiter = ",")
for row in csv:
  print(row) 
fr.close()

Sample Output:

Write a list of dictionaries to a CSV file:
['Name', 'Class']
['Jasmine Barrett', 'V']
['Garry Watson', 'V']
['Courtney Caldwell', 'VI']

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to write a list of dictionaries to a CSV file using csv.DictWriter, then read the file with csv.reader and print each row.
• Write a Python script to convert a dictionary into a CSV file, then open the file using csv.reader and verify that the header matches the dictionary keys.
• Write a Python function to export multiple dictionaries to a CSV file and then read and display the contents using csv.reader.
• Write a Python program to generate a CSV file from a list of dictionaries, ensuring that all dictionaries have the same keys, then read and print the file's rows.

Python Code Editor:

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