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There is already a question on SO that explains how to insert a line into the middle of a python file at a specific line number.

But what if I have 2 files. inputfile.txt and outputfile.txt (which already has some text) and I want to insert all of inputfile.txt (with formatting preserved) into the middle of outputfile.txt?

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  • No OS supports inserting text into the middle of a text file. Commented Jul 16, 2018 at 2:52
  • I thought you could insert a line at a specific point into a text file, using python? stackoverflow.com/questions/10507230/… Commented Jul 16, 2018 at 2:54
  • I believe it will be the exact same as the question in the link you posted Commented Jul 16, 2018 at 2:56
  • That is not "inserting a line into a file", that is "creating a new file with the line inserted". Commented Jul 16, 2018 at 3:03

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Why do you think it is any different from this probable SO question you are referring to?

Its just that instead of inserting a line, you need to read your inputfile.txt into a variable as shown here and insert that into the file, instead of the value as clearly shown in the question. (links provided above)

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insert contents of "/inputFile.txt" into "/outputFile.txt" at line 90

with open("/inputFile.txt", "r") as f1:
    t1 = f1.readlines()
with open("/outputFile.txt", "r") as f2:
    t2 = f2.readlines()
t2.insert(90, t1)
with open("/outputFile.txt", "w") as f2:
    f2.writelines(t2)

That should do it

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