Python打開文件並刪除一行

Question

我需要一個導入文件的程序。 我的文件是：

1 abc 
2 def 
3 ghi 
4 jkl 
5 mno 
6 pqr 
7 stu. 

我想刪除行1,6和7

㈣嘗試了以下要導入的文件：

f = open("myfile.txt","r") 
lines = f.readlines() 
f.close() 
f = open("myfile.txt","w") 
if line = 1: 
    f.write(line) 
f.close 

Answer 1

你可以刪除這些行如下：

lines = [] 

with open('myfile.txt') as file: 
    for line_number, line in enumerate(file, start=1): 
     if line_number not in [1, 6, 7]: 
      lines.append(line) 

with open('myfile.txt', 'w') as file: 
    file.writelines(lines) 

通過使用Python的with命令，它確保噸之後他的文件被正確關閉。

Answer 2

# Open your file and read the lines into a list called input 
input = open('my_file.txt', 'r').readlines() 

#create a list of lines you want to skip 
lines_to_skip = [1, 6, 7] 

with open('my_new_file.txt', 'w') as output: 
    for i, line in enumerate(input): 
     # check to see if the line number is in the list. We add 1 because python counts from zero. 
     if i+1 not in lines_to_skip: 
      output.write(line)