with open("test.txt", "r") as fp:
   lines = fp.readlines()
print(lines[3])

Test.txt是文件名 打印test.txt中的第4行

打印所需的行。 打印行在所需行位的上方/下方。

def dline(file,no,add_sub=0):
    tf=open(file)
    for sno,line in enumerate(tf):
        if sno==no-1+add_sub:
         print(line)
    tf.close()

执行---->dline("D:\dummy.txt"，6)即dline("文件路径"，line_number，如果你想要搜索行的上行给出1为低-1这是可选的默认值将采取0)

从某一行读出:

n = 4   # for reading from 5th line
with open("write.txt",'r') as t:
     for i,line in enumerate(t):
         if i >= n:             # i == n-1 for nth line
            print(line)

您可以使用一种最简单的逻辑将字符串拆分为数组或List。

f = open('filepath')
r = f.read()
s = r.split("\n")
n = [linenumber1, linenumber2] # [26, 29] in your 
                               #case
for x in n:
  print(s[x-1])
f.close()

如果要读取的文件很大，并且你不想一次在内存中读取整个文件:

fp = open("file")
for i, line in enumerate(fp):
    if i == 25:
        # 26th line
    elif i == 29:
        # 30th line
    elif i > 29:
        break
fp.close()

注意第n行i == n-1。

在Python 2.6或更高版本中:

with open("file") as fp:
    for i, line in enumerate(fp):
        if i == 25:
            # 26th line
        elif i == 29:
            # 30th line
        elif i > 29:
            break

打印第3行，

line_number = 3

with open(filename,"r") as file:
current_line = 1
for line in file:
    if current_line == line_number:
        print(file.readline())
        break
    current_line += 1

原作者:Frank Hofmann