seek - Python: How to 'write' on the second line of a text file ignoring the first line -

i wanna know code/s can 'write' in text file second line.

atm write data on text file:

with open("data1.txt", "w") file:      file.write(str(round(strength, 2)) + "\n")  file.close()

'strength' in value(number)

to 'read' specific line (the second line in case) text file:

with open("data1.txt", "r", encoding="utf-8") file:      s1 = file.readlines()     s1 = float(s1[1].strip()) file.close()

so how can 'write in file second line starting with:

with open("data1.txt", "w+", encoding="utf-8") file:

i know .. 'write' beginning of text file need use:

file.seek(0)

so how can replace/change/write second line?

many thanks

you need read file first:

with open("file.txt", "r") file:     lines = file.readlines()

then change second line:

lines[1] = str(round(strength, 2)) + "\n"

then write back:

with open("file.txt", "w") file:     line in lines:         file.write(line)

Sp