Python将文本与变量写入TXT文件报错求助

Hey there! Let's break down and fix the issue you're facing step by step.

What's Causing the Error? #

The TypeError: write() takes exactly one argument (3 given) pops up because the file.write() method only accepts a single string argument, but you’re passing three separate values (like "Number Plate:", np, and "\n") each time you call it. Also, there’s a typo in your code: f.wrtie should be f.write—that would’ve caused another error once you fixed the first issue!

Solutions to Fix It #

You need to combine your text and variables into one single string before passing it to write(). Here are a few clean, easy ways to do this:

1. Use F-Strings (Recommended for Python 3.6+)

F-strings let you embed variables directly into strings in a super readable way:

f = open("Output.txt", "a")
f.write(f"Number Plate: {np}\n")
f.write(f"Valid: {valid}\n")
f.write(f"Speed: {speed}\n")
f.write(f"Ticket: {ticket}\n")
f.write(f"Ticket Price: {ticketprice}\n")
f.write("\n")
f.close()

2. String Concatenation

You can glue strings together with the + operator—just make sure non-string variables (like numbers) are converted to strings first with str():

f = open("Output.txt", "a")
f.write("Number Plate: " + str(np) + "\n")
f.write("Valid: " + str(valid) + "\n")
f.write("Speed: " + str(speed) + "\n")
f.write("Ticket: " + str(ticket) + "\n")
f.write("Ticket Price: " + str(ticketprice) + "\n")
f.write("\n")
f.close()

3. Use str.format() (Great for Older Python Versions)

If you’re working with Python 3.5 or earlier, str.format() is a reliable option:

f = open("Output.txt", "a")
f.write("Number Plate: {}\n".format(np))
f.write("Valid: {}\n".format(valid))
f.write("Speed: {}\n".format(speed))
f.write("Ticket: {}\n".format(ticket))
f.write("Ticket Price: {}\n".format(ticketprice))
f.write("\n")
f.close()

Bonus: Use a Context Manager (Even Better!) #

To avoid forgetting to close the file or running into unexpected errors, use a with statement—it automatically closes the file for you when you’re done:

with open("Output.txt", "a") as f:
    f.write(f"Number Plate: {np}\n")
    f.write(f"Valid: {valid}\n")
    f.write(f"Speed: {speed}\n")
    f.write(f"Ticket: {ticket}\n")
    f.write(f"Ticket Price: {ticketprice}\n")
    f.write("\n")

内容的提问来源于stack exchange，提问作者user9754923