[Python] I'm not sure why the file won't write to, and other problems with basic code [closed]

So this program is for an assignment, and honestly I'm not good at Python in the slightest. This program is intended to read a file that has been inputted, read the DNA sequence(s) provided in each line, and then create a new text file with a summary of what was found. [This is what an output file should generally look like when complete.][1]

However, I'm getting an error that says

File c:\users\super\.spyder-py3\program4.py:53
51 outputfile = input("Choose the name for your file:")
52 with open(outputfile, "w") as file:
---> 53 outputfile.write("FRAGMENT GC RATIO COMMENTS\n")
54 outputfile.write("\n")
55 outputfile.write(dnaFragment, gcratio, comment, "\n")

AttributeError: 'str' object has no attribute 'write'"```

I have attached my entire code and the error message in the image links below. If there's anything else that needs fixing, please let me know.
[Link 1][2]
[Link 2][3]


[1]: https://i.sstatic.net/51tYcgnH.png
[2]: https://i.sstatic.net/JphZuFb2.png
[3]: https://i.sstatic.net/M3Wn2jpB.png

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