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Python: Count the number of lines in a given CSV file

Python module: Exercise-2 with Solution

Write a Python program to count the number of lines in a given CSV file. Use csv.reader

Sample Solution:

Python Code:

import csv
reader = csv.reader(open("employees.csv"))
no_lines= len(list(reader))
print(no_lines)



Sample Output: 


52



Step1 - Open the CSV file using the open("employees.csv").

Step2 - Create a CSV reader by calling the function csv.reader(reader)  as the result of the previous step.

Step3 - Get a list representation of the CSV file by calling list(reader) of the previous step.

Step4 - Count the number of lines in the CSV file with len(list(reader)).

Flowchart:

Flowchart: Count the number of lines in a given CSV file.

Python Code Editor:


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Previous: Write a Python program to read and display the content of a given CSV file.
Next: Write a Python program to parse a given CSV string and get the list of lists of string values.

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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