Aug 10, 2017 · Use csv.writer: import csv with open('thefile.csv', 'rb') as f: data = list(csv.reader(f)) import collections counter = collections.defaultdict(int) for row in data: counter[row[0]] += 1 writer = csv.writer(open("/path/to/my/csv/file", 'w')) for row in data: if counter[row[0]] >= 4: 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.

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, 2024 · Pandas is a powerful Python library widely used for data manipulation and analysis, now Pandas also offers methods for converting data into CSV format and writing it to a file.

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.

3 days ago · Return a writer object responsible for converting the user’s data into delimited strings on the given file-like object. csvfile can be any object with a write() method. If csvfile is a file object, it should be opened with newline='' [1].

Jan 24, 2025 · Saving data to a CSV file allows for easy sharing, archiving, and further analysis. This blog will explore the fundamental concepts, usage methods, common practices, and best practices when saving CSV files in 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.

In this tutorial, you will learn about reading and writing CSV files in Python with the help of examples. CSV is the most popular file format for working with tabular data.

Oct 22, 2024 · In this tutorial, we will explore how to save CSV files in Python using the built-in csv module and the pandas library. A CSV file is a plain text file that contains data separated by commas. Each line in the file corresponds to a row in the table, and each value in the row is separated by a comma. For example: