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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:

Flowchart: Write dictionaries and a list of dictionaries to a given CSV file.
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:

Flowchart: Write dictionaries and a list of dictionaries to a given CSV file.

Python Code Editor:


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Previous: Write a Python program to write (without writing separate lines between rows) and read a CSV file with specified delimiter.
Next: Python built-in Modules Exercise Home.

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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