The error tells us that the file has not been opened for writing.
#PYTHON LIST TO TXT WRITE CODE#
Here is the error we get when we run our code if we don’t delete the months.txt file created in the previous example: $ python write_list_to_file.py …notice that we have removed the second parameter passed to the open() function that was telling the function to open the file in write mode: output_file = open('months.txt') Replace the following line in your Python code: output_file = open('months.txt', 'w') I want to see what happens if we don’t open the file explicitly in write mode. The output looks a lot better now: $ cat months.txtĪpril What Error Do You See When Writing to a File Opened in Read Mode? It looks like we are missing new line characters at the end of each line, let’s add it to the write method in each iteration of the for loop: output_file = open('months.txt', 'w') Now, let’s have a look at how the content of the file looks like using the cat command: $ cat months.txt Then, we close the file object once we have written all the elements in the list to it. Each iteration of the for loop writes a month to the file. Using the Python open() built-in function we open a new file in write mode. We will open a file object in write mode and then use a for loop to write each element to the file: output_file = open('months.txt', 'w') Let’s have a look at how you can take the list of strings below and store each string in a file using Python. This might be required, for example, if every time you run your application you store data in a file and that data can be read and used the next time you run your application. Imagine you are building an application that needs to persist a list of items after its execution.
#PYTHON LIST TO TXT WRITE HOW TO#
Conclusion How to Store the Elements of a Python List in a File.How to Write a List to a File Using a Python Lambda.Writing a Python List to a File Using Writelines.Write a List to a File Using the String Join Method.Writing a List to a File Using the With Open Statement.What Error Do You See When Writing to a File Opened in Read Mode?.How to Store the Elements of a Python List in a File.
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