How do i change the value of a column in a csv file in python?
View Discussion Show Improve Article Save Article View Discussion Improve Article Save Article Let us see how we can replace the column value of a CSV file in Python. CSV file is nothing but a comma-delimited file. Method 1: Using Native Python way Using replace() method, we can replace easily a text into another text. In the below code, let us have an input CSV file as “csvfile.csv” and be opened in “read” mode. The join() method takes all lines of a CSV file in an iterable and joins them into one string. Then, we can use replace() method on the entire string and can perform single/multiple replacements. In the entire string, the given text is searched and replaced with the specified text. Example: The input file will be: Python3
Output: Method 2: Using Pandas DataFrame We can read the CSV file as a DataFrame and then apply the replace() method. Python3
Output: An alternative to the accepted answer is to:
Test CSV:
Test Code:
The main difference is that you don't have to manually open the input file and create the output file, as
The loop goes over the CSV row-by-row (except for the header row), so you can do whatever processing you need on each row. If you still want to retain the original, you could pass in a Also,
note that with in-place editing, "standard output is directed to the input file", so How do you change a column value in Python?How to Update Rows and Columns Using Python Pandas. Create a Pandas Dataframe. In this whole tutorial, we will be using a dataframe that we are going to create now. ... . Updating Columns. ... . Update the Case of the Column Names. ... . Updating Row Values. ... . Update Rows and Columns Based On Condition.. How do I edit an existing CSV file in Python?Editing the contents of an existing CSV file will require the following steps: read in the CSV file data, edit the lists (Update information, append new information, delete information), and then write the new data back to the CSV file.
How do I edit columns in a CSV file?Open the CSV file in Microsoft Excel or a compatible application, such as a text editor or Notepad. Move your cursor to an empty line and type an H in column A. Press the Tab key to move to the next column and enter the value that you want to import for that field. Repeat step b for all the fields in the row.
How do I change data in a CSV file?Click the Data tab, and select From Text.. Find your CSV file stored on your computer, and click Open.. In the Text Import Wizard window, be sure Delimited is selected as your file type.. In the File origin drop down, select 65001 : Unicode (UTF-8).. Check the My Data has headers box.. Click the Next button.. |