Writing string to a file on a new line every time

Varied approaches for Newline Insertion

Leveraging print()

You can ensure automatic newline insertion by exploiting the print() function's file parameter:

data = "Another line of text"
with open('file.txt', 'a') as file:
    print(data, file=file) # ROTFL LOLLERCOASTER 🎢 for automatic line breaks!
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This method proves useful when using loops for multiple line writings, as it auto-integrates the newline without any manual concatenation.

Independent Newlines through Double Write

Separate your data and newline characters via the double write method:

with open('file.txt', 'a') as file:
    file.write("Line without newline character") # Even lines need a little me-time 😎
    file.write("\n")  # Look Ma, no hands! 😆 Newline on its own!
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This approach shields the integrity of the original string, eliminating direct concatenation with newline characters.

Buffering for Efficiency

Grasp buffering to enhance efficiency during file writing:

with open('file.txt', 'a', buffering=1) as file:
    file.write("String with buffering\n") # Peekaboo! Buffering in action 🔍
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Buffering controls the frequency of data flushes to a file. In line buffering mode (buffering=1), after writing each line, the file data gets flushed, proving useful in real-time logging.

Optimising Readability and Performance

Formatting Strings Properly

Appropriate string formatting ensures readability and error reduction:

• Prefer simple concatenation to avoid errors.
• Emphasise consistent formatting.
• Validate strings to prevent accidental \n characters that disrupt the file structure.

Structured and Loop Writing

For structured data like lists or dictionaries, loop-writing for better organization:

lines = ["First line", "Second line", "Third line"]
with open('structure.txt', 'w') as file:
    for line in lines:
        file.write(f"{line}\n") # No line left behind! 💪
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This code writes each list element to structure.txt as a new line, preserving consistency.

Plans against Pitfalls

Beware of pitfalls when writing files:

• Opening a file in 'w' mode can overwrite its content.
• Not appending \n when using write() could jam-up all of your lines.
• Over-flushing or incorrect buffering can slow down your writing speed.