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Python: Python list of lists to a csv file and display the content

Python CSV File Reading and Writing: Exercise-10 with Solution

Write a Python program to write a Python list of lists to a csv file. After writing the CSV file read the CSV file and display the content.

Sample Solution:

Python Code :

import csv
data = [[10,'a1', 1], [12,'a2', 3], [14, 'a3', 5], [16, 'a4', 7], [18, 'a5', 9]]
with open("temp.csv", "w", newline="") as f:
   writer = csv.writer(f)
   writer.writerows(data)
with open('temp.csv', newline='') as csvfile:
 data = csv.reader(csvfile, delimiter=' ')
 for row in data:
   print(', '.join(row))

temp.csv

"country_id"|"country_name"|"region_id"
"AR"|"Argentina"| 2
"AU"|"Australia"| 3
"BE"|"Belgium"| 1
"BR"|"Brazil"| 2
"CA"|"Canada"| 2

Sample Output:

10,a1,1
12,a2,3
14,a3,5
16,a4,7
18,a5,9

Python Code Editor:


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Previous: Write a Python program to create an object for writing and iterate over the rows to print the values.
Next: Write a Python program to write a Python dictionary to a csv file. After writing the CSV file read the CSV file and display the content.

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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