Insert contents of a file in middle of another file with Python?

Question

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?

No OS supports inserting text into the middle of a text file. — Ignacio Vazquez-Abrams, Jul 16 '18 at 02:52
I thought you could insert a line at a specific point into a text file, using python? https://stackoverflow.com/questions/10507230/insert-line-at-middle-of-file-with-python — Foobar, Jul 16 '18 at 02:54
I believe it will be the exact same as the question in the link you posted — ak_slick, Jul 16 '18 at 02:56
That is not "inserting a line into a file", that is "creating a new file with the line inserted". — Ignacio Vazquez-Abrams, Jul 16 '18 at 03:03

score 3 · Accepted Answer · answered Jul 16 '18 at 02:56

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)

score 0 · Answer 2 · answered Jul 16 '18 at 03:08

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

Insert contents of a file in middle of another file with Python?

2 Answers2

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

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