Detailed explanation on deleting a certain line in file operation in Python

#文本内容
Yesterday when I was young
昨日当我年少轻狂
The tasting of life was sweet
生命的滋味是甜的
As rain upon my tongue
tasting
I lived by night and shunned the naked light of day
tasting123
And only now I see how the time ran away
tasting
 
tasting

with open("fileread.txt","r",encoding="utf-8") as f:
    lines = f.readlines()
    #print(lines)
with open("fileread.txt","w",encoding="utf-8") as f_w:
    for line in lines:
        if "tasting123" in line:
            continue
        f_w.write(line)