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Python: Write (without writing separate lines between rows) and read a CSV file with specified delimiter

Python module: Exercise-6 with Solution

Write a Python program to write (without writing separate lines between rows) and read a CSV file with specified delimiter. Use csv.reader

Sample Solution:

Python Code:

import csv     
fw = open("test.csv", "w", newline='')
writer = csv.writer(fw, delimiter = ",")
writer.writerow(["a","b","c"])
writer.writerow(["d","e","f"])
writer.writerow(["g","h","i"])
fw.close()
 
fr = open("test.csv", "r")
csv = csv.reader(fr, delimiter = ",")
for row in csv:
  print(row) 
fr.close()

Sample Output: 

['a', 'b', 'c']
['d', 'e', 'f']
['g', 'h', 'i']

Flowchart:

Flowchart: Write (without writing separate lines between rows) and read a CSV file with specified delimiter.

Python Code Editor:


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Next: Write a Python program to write dictionaries and a list of dictionaries to a given CSV file.

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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