Python File I/O

Photo by Ilya Pavlov on Unsplash

Unlock the file input and output world in Python with these handy snippets. Learn how to read the entire content of a file or go line by line. You can also write, append, or perform both read and write operations. Additionally, discover how to create a translator that converts text to zh-TW (traditional Chinese) and writes it in a new file, with each line limited to 50 characters for easy readability. Explore the endless possibilities of file manipulation in Python!

Read

• Read the entire file.

with open('files/file.txt', mode='r') as my_file:
    print(my_file.read())

• Read line by line.

with open('files/file.txt', mode='r') as my_file:
    print(my_file.readline())

Write

with open('new.txt', mode='w') as my_file:
    text = my_file.write('this is a new file')

Append

with open('test.txt', mode='a') as my_file:
    text = my_file.write(':)')

Read and Write

with open('test.txt', mode='r+') as my_file:
    text = my_file.write('hey it\'s me.')

Translator

• Translate the word to zh-TW and write in a new file.
• Move to a new line when writing 50 characters in one line.

from translate import Translator

# Create a Translator instance
translator = Translator(to_lang="zh-TW")

try:
    with open('./untranslated_words.txt', mode='r') as my_file:
        with open('./translated-zh-tw.txt', mode='w') as my_file2:
            while True:
                # Read a chunk of text (up to 500 characters) from the file
                chunk = my_file.read(500)
                if not chunk:
                    # End of file reached
                    break

                # Translate the chunk
                translation = translator.translate(chunk)

                # Write the translated text in lines of 50 characters each
                for i in range(0, len(translation), 50):
                    line = translation[i:i + 50]
                    my_file2.write(line + '\n')

except FileNotFoundError as err:
    print('File does not exist')
    raise err