python获取文件行数

代码如下：

file = r"2.txt"#引号内为文件路径
count = 1
fp = open(file, "r", encoding='utf-8')
while 1:
    buffer = fp.read(8*1024*1024)
    if not buffer:
        break
    count += buffer.count('\n')
print("行数:", count)

效果如下;