Jan 31, 2013 · You need to put % name straight after the string: The reason your code doesn't work is because you are trying to % a file, which isn't string formatting, and is also invalid. you can do something like. or f = open('%s.csv' % name, 'wb') Very similar to peixe. Another option - the f-string formatting (ref):

Sep 19, 2024 · To write a variable to a file in Python using the write() method, first open the file in write mode with open('filename.txt', 'w'). Then, use file_object.write('Your string here\n') to write the string to the file, and finally, close the file with file_object.close() .

Feb 23, 2023 · append() method in Python is used to add a single item to the end of list. This method modifies the original list and does not return a new list. Let's look at an example to better understand this.

Jan 16, 2011 · The simplest way to append more text to the end of a file would be to use: with open('/path/to/file', 'a+') as file: file.write("Additions to file") file.close() The a+ in the open(...) statement instructs to open the file in append mode and allows read and write access.

Dec 14, 2009 · To save a variable (such as a NumPy array) as a .txt file in Python, you can use the numpy.savetxt function. Here's an example: import numpy as np # Example variable (NumPy array) i = np.random.rand(10, 5) # A 10x5 array with random values # Save the array to a text file np.savetxt("output.txt", i, fmt="%.5f", delimiter=",") # Save with 5 ...

Dec 19, 2024 · In Python, we can create a file using the following three modes: Write (“w”) Mode: This mode creates a new file if it doesn’t exist. If the file already exists, it truncates the file (i.e., deletes the existing content) and starts fresh. Append (“a”) Mode: This mode creates a …

Apr 12, 2025 · Storing multiple variables in a file is a common task in programming, especially when dealing with data persistence or configuration settings. In this article, we will explore three different approaches to efficiently writing multiple variables in a file using Python.

Apr 10, 2024 · Use a formatted string literal to create a file name using variables, e.g. f'{variable}.txt'. Formatted string literals enable us to include expressions and variables inside of a string by prefixing the string with f. f.write('first line' + '\n') . f.write('second line' + '\n')

Feb 14, 2025 · I explained how to save a single variable to a Python file, save multiple variables to a Python file, use string formatting, write variables on separate lines, and save variables with file name from user input.

Sep 7, 2021 · In this article, I'll create a simple project where I'll write to, append to, and then finally at the end read from a text file in Python to show you how it's done. You can follow along with me and go through the same steps I do.