import csv import collections with open('file.csv', 'rb') as f: data = list(csv.reader(f)) counter = collections.defaultdict(int) for row in data: counter[row[0]] += 1 writer = csv.writer(open("file1.csv", 'w')) for row in data: if counter[row[0]] >= 1: writer.writerow(row)

Jun 26, 2023 · There are various methods to save lists to CSV which we will see in this article. The code uses the csv module to write data into a CSV file named ‘GFG’. It defines the field names as [‘Name’, ‘Branch’, ‘Year’, ‘CGPA’] and the data rows as a list of lists.

May 21, 2022 · import csv with open('120301.csv', 'w', newline='') as file: writer = csv.writer(file) for line in open('120301.KAP'): rec = line.strip() if rec.startswith('PLY'): writer.writerow(rec.split(',')) In a similar way, the csv.reader can easily read records from your input file.

Oct 7, 2024 · In this article, we will learn how we can export a Pandas DataFrame to a CSV file by using the Pandas to_csv() method. By default, the to csv() method exports DataFrame to a CSV file with row index as the first column and comma as the delimiter.

Feb 22, 2023 · In this article, we will discuss how to export a list to CSV and text file using R Programming language. Exporting to both of these types of files can be done using capture.output() function. This function is mainly used to evaluate its arguments with the output being returned as a character string

Apr 29, 2023 · To create and save data to a CSV file in Python, use the built-in ‘csv’ module. There are two main classes, ‘csv.writer’ and ‘csv.DictWriter’, which help create and write data into CSV files.

Jul 21, 2015 · The problem I need to solve now is how to export the numbers generated into one CSV file so that they can be analysed. I believe that the CSV module needs to be imported and implemented but I am not sure how to do this.

Jan 23, 2025 · In Python, saving data to a CSV file is a common task in various applications, such as data analysis, web scraping, and data logging. This blog will explore the fundamental concepts, usage methods, common practices, and best practices of saving data to CSV files using Python.

Dec 6, 2022 · Learn how to read and write CSV files with Python using the built-in CSV module or by using Numpy or Pandas. With lot's of example code.

May 3, 2024 · Explore how to use the Pandas library to read the CSV file with the read_csv() and extract the data from the desired column as a DataFrame object.