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Python: Read a given CSV file as a dictionary

Python CSV File Reading and Writing: Exercise-4 with Solution

Write a Python program to read a given CSV file as a dictionary.

Sample Solution:

Python Code :

import csv
data = csv.DictReader(open("departments.csv"))
print("CSV file as a dictionary:\n")
for row in data:
   print(row)

departments.csv

department_id, department_name,  manager_id,  location_id
10, Administration, 200, 1700
20, Marketing, 201, 1800
30, Purchasing, 114, 1700
40, Human Resources, 203, 2400
50, Shipping, 121, 1500
60, IT, 103, 1400
70, Public Relations, 204, 2700
80, Sales, 145, 2500

Sample Output:

CSV file as a dictionary:

OrderedDict([('department_id', '10'), (' department_name', ' Administration'), ('  manager_id', ' 200'), ('  location_id', ' 1700')])
OrderedDict([('department_id', '20'), (' department_name', ' Marketing'), ('  manager_id', ' 201'), ('  location_id', ' 1800')])
OrderedDict([('department_id', '30'), (' department_name', ' Purchasing'), ('  manager_id', ' 114'), ('  location_id', ' 1700')])
OrderedDict([('department_id', '40'), (' department_name', ' Human Resources'), ('  manager_id', ' 203'), ('  location_id', ' 2400')])
OrderedDict([('department_id', '50'), (' department_name', ' Shipping'), ('  manager_id', ' 121'), ('  location_id', ' 1500')])
OrderedDict([('department_id', '60'), (' department_name', ' IT'), ('  manager_id', ' 103'), ('  location_id', ' 1400')])
OrderedDict([('department_id', '70'), (' department_name', ' Public Relations'), ('  manager_id', ' 204'), ('  location_id', ' 2700')])
OrderedDict([('department_id', '80'), (' department_name', ' Sales'), ('  manager_id', ' 145'), ('  location_id', ' 2500')])

Python Code Editor:


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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