Writing List to Files in Python
There are various methods for writing files in Python. Here, we will discuss some commonly used techniques.
- Using write()
- Using writelines()
- Using String Join Along with “with open” syntax
Writing List to Files in Python using write()
The file is opened with the open() method in w+ mode within the with block, the w+ argument will create a new text file in write mode with the help of write(). The with block ensures that once the entire block is executed the file is closed automatically.
Python3
# assign listl = ['Geeks','for','Geeks!']# open filewith open('gfg.txt', 'w+') as f: # write elements of list for items in l: f.write('%s\n' %items) print("File written successfully")# close the filef.close() |
Output:
File written successfully
Here is the text file gfg.txt created:
Writing List to Files in Python using writelines()
The file is opened with the open() method in w mode within the with block, the argument will write text to an existing text file with the help of readlines(). The with block ensures that once the entire block is executed the file is closed automatically.
Python3
L = ["Geeks\n", "for\n", "Geeks\n"]# writing to filefile1 = open('test1/myfile.txt', 'w')file1.writelines(L)file1.close() |
Output:
Below is the text file gfg.txt:
Writing List to Files in Python using String Join Along with “with open” syntax
This Python code writes a list (`my_list`) to a file named “output.txt”. It uses the “with open” syntax for automatic file handling. The list elements are joined into a string with newline characters, and this string is written to the file. A confirmation message is printed.
Python3
# Sample list of datamy_list = ["item1", "item2", "item3", "item4"]# Specify the file pathfile_path = "main.txt"# Using "with open" syntax to automatically close the filewith open(file_path, 'w') as file: # Join the list elements into a single string with a newline character data_to_write = '\n'.join(my_list) # Write the data to the file file.write(data_to_write)print(f"The list has been written to {file_path}.") |
Output
Reading and Writing lists to a file in Python
Reading and writing files is an important functionality in every programming language. Almost every application involves writing and reading operations to and from a file. To enable the reading and writing of files programming languages provide File I/O libraries with inbuilt methods that allow the creation, updation as well and reading of data from the files. Python is no exception. Python too offers inbuilt methods to perform file operations. The io module in Python is used for file handling.
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