How Can I Embed Variables into Text Files Using Python?

How to Embed Variable Values Into Text Files in Python

In Python, one can open a text file and append a string variable to it. Consider the provided code:

text_file = open("Output.txt", "w")

text_file.write("Purchase Amount: " 'TotalAmount')

text_file.close()

Here, we aim to substitute the value of the string variable TotalAmount into the text document. To achieve this efficiently, we recommend employing a context manager:

with open("Output.txt", "w") as text_file:
    text_file.write("Purchase Amount: %s" % TotalAmount)

This ensures the file is automatically closed after use, enhancing code reliability.

Alternatively, you can opt for the explicit version:

text_file = open("Output.txt", "w")
text_file.write("Purchase Amount: %s" % TotalAmount)
text_file.close()

For Python 2.6 or higher, str.format() is preferred:

with open("Output.txt", "w") as text_file:
    text_file.write("Purchase Amount: {0}".format(TotalAmount))

In Python 2.7 and later, you can use {} instead of {0}.

In Python 3, the print function offers a convenient file parameter:

with open("Output.txt", "w") as text_file:
    print("Purchase Amount: {}".format(TotalAmount), file=text_file)

Finally, Python 3.6 introduces f-strings for a concise alternative:

with open("Output.txt", "w") as text_file:
    print(f"Purchase Amount: {TotalAmount}", file=text_file)

By implementing these approaches, you can effectively print string variables into text files, catering to varying Python versions and preferences.

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