python读取文件时出现空行的解决方法

#代码1
with open('test.txt','r') as f:
    lines = f.readlines()
    for line in lines:
        print(line,end="")
f.close()
 
#代码2.
f = open("test.txt","rt") #网上很多说换成rU，或者rt。
content = f.readlines()
for i in content:
    print(i,end="")
f.close()
==========================================================
ccccccccccd888888888
ddddddddddddddddd00
333343434343fsddf
safsdfasdfsadfsadsf
ccccccccccd888888888
ddddddddddddddddd00
333343434343fsddf
safsdfasdfsadfsadsf