Python implements the method of appending text to a specified line in txt

This article mainly introduces the method of appending text to a specified line in txt in python. It has a certain reference value. Now I share it with you. Friends in need can refer to it

As shown below:

fp = file('data.txt')
lines = []
for line in fp: 
  lines.append(line)
fp.close()
 
lines.insert(1, 'a new line') # 在第二行插入
s = '\n'.join(lines)
fp = file('data.txt', 'w')
fp.write(s)
fp.close()

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