Python: Write dictionaries and a list of dictionaries to a given CSV file
Python module: Exercise-7 with Solution
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:

Python Code Editor:
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Python: Tips of the Day
Inverts a dictionary with non-unique hashable values:
Example:
def tips_collect_dictionary(obj): inv_obj = {} for key, value in obj.items(): inv_obj.setdefault(value, list()).append(key) return inv_obj ages = { "Owen": 25, "Jhon": 25, "Pepe": 15, } print(tips_collect_dictionary(ages))
Output:
{25: ['Owen', 'Jhon'], 15: ['Pepe']}
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