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:
52Step1 - 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:
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
Inverts a dictionary with non-unique hashable values:
Example:
def tips_collect_dictionary(obj):
inv_obj = {}
for key, value in obj.items():
inv_obj.setdefault(value, list()).append(key)
return inv_obj
ages = {
"Owen": 25,
"Jhon": 25,
"Pepe": 15,
}
print(tips_collect_dictionary(ages))
Output:
{25: ['Owen', 'Jhon'], 15: ['Pepe']}
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