file:
a
b
c
d

file上面插入wer
wer
a
b
c
d

f1 = open("file1.txt","r")
data = f1.read()

for i in range(13511):
  with open("file2.txt","r+") as f:
    old = f.read()
    f.seek(0)
    f.write(data)
    f.write(old)