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))

Sample Output:


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

Python Code Editor:

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Python: Tips of the Day

For-else construct useful when searched for something and find it:

# For example assume that I need to search through a list and process each item until a flag item is found and 
# then stop processing. If the flag item is missing then an exception needs to be raised.

for i in mylist:
    if i == theflag:
    raise ValueError("List argument missing terminal flag.")