How do i count the number of rows in a csv file in python?
View Discussion Show Improve Article Save Article View Discussion Improve Article Save Article CSV (Comma Separated Values) is a simple fileformat used to store tabular data, such as a spreadsheet or database. A CSV file stores tabular data (numbers and text) in plain text. Each line of the file is a data record. Each record consists of one or more fields, separated by commas. The use of the comma as a field separator is the source of the name for this file format. In this article, we are going to discuss various approaches to count the number of lines in a CSV file using Python. We are going to use the below dataset to perform all operations: Python3
Output: To count the number of lines/rows present in a CSV file, we have two different types of methods:
Using len() functionUnder this method, we need to read the CSV file using pandas library and then use the len() function with the imported CSV file, which will return an int value of a number of lines/rows present in the CSV file. Python3
Output: Using a counterUnder this approach, we will be initializing an integer rowcount to -1 (not 0 as iteration will start from the heading and not the first row)at the beginning and iterate through the whole file and incrementing the rowcount by one. And in the end, we will be printing the rowcount value. Python3
Output: 2018-10-29 EDITThank you for the comments. I tested several kinds of code to get the number of lines in a csv file in terms of speed. The best method is below.
Here is the code tested.
The result was below.
In conclusion,
How do I count the number of rows in a csv file?Using len() function
Under this method, we need to read the CSV file using pandas library and then use the len() function with the imported CSV file, which will return an int value of a number of lines/rows present in the CSV file.
How do I find the number of rows and columns in a csv file in Python?To get the number of rows, and columns we can use len(df. axes[]) function in Python.
How do you count rows in CSV using pandas?Get the number of rows in a Pandas DataFrame. Using .shape [0] The .shape property gives you the shape of the dataframe in form of a (rows, column) tuple. ... . Using the len() function. You can also use the built-in python len() function to determine the number of rows.. How do you count lines in Python?Use readlines() to get Line Count
This is the most straightforward way to count the number of lines in a text file in Python. The readlines() method reads all lines from a file and stores it in a list. Next, use the len() function to find the length of the list which is nothing but total lines present in a file.
|