的Python - 删除文件全线使用特定的数据

Question

我来这里是因为我耗尽了我所有的资源来建造这个节目......

我想删除使用特定的数据这样

一个文件的行

编号\ t姓名\ t Colum2 \ t Colum3 \ t Colum4 \ t Colum5 \ n

我想删除基于代码

整行，如果我键入鳕鱼e，* .py将搜索包含此字符串的行，并将其删除。

任何好的灵魂能帮助我吗？

Answer 1

假设下面的输入（上generatedata.com产生）并被保存为input.txt中：

1 Jennifer O. Ingram P.O. Box 724, 4252 Arcu. St. 
2 Lacy N. Fields 5998 Scelerisque Road 
3 Blythe P. Abbott Ap #251-2931 Magna. Rd. 
4 Alyssa Y. Cobb 438-8110 Enim. Rd. 
5 Peter Z. May Ap #271-8340 Eget Avenue 
6 MacKenzie A. Santos 8366 Nunc. St. 
7 Kevyn C. Willis Ap #583-9635 Erat Avenue 
8 Nissim E. Ward 7606 Duis Rd. 
9 Duncan J. Armstrong Ap #164-282 Id, St. 
10 Jesse B. Barnett P.O. Box 742, 5758 Sagittis Street 

下面的代码将删除符合代码5：

# Declare which code you want to delete. 
# This can be further improved by being a parameter 
# or read from outside the script. 
code = 5 
removed_lines = 0 
f = open("input.txt","r+") 
lines = f.readlines() 
f.seek(0) 
for line in lines: 
    # Writes to the file all the lines except for those that 
    # begin with the code declared above. 
    if not line.startswith(str(code)): 
     f.write(line) 
    else: 
     print("removed line %s" % line) 
     removed_lines += 1 
f.truncate() 
f.close() 
print("%d lines were removed" % removed_lines) 

和input.txt中会：

1 Jennifer O. Ingram P.O. Box 724, 4252 Arcu. St. 
2 Lacy N. Fields 5998 Scelerisque Road 
3 Blythe P. Abbott Ap #251-2931 Magna. Rd. 
4 Alyssa Y. Cobb 438-8110 Enim. Rd. 
6 MacKenzie A. Santos 8366 Nunc. St. 
7 Kevyn C. Willis Ap #583-9635 Erat Avenue 
8 Nissim E. Ward 7606 Duis Rd. 
9 Duncan J. Armstrong Ap #164-282 Id, St. 
10 Jesse B. Barnett P.O. Box 742, 5758 Sagittis Street 

如果文件很大，脚本的运行可能需要更多的时间我和资源。

Answer 2

您可以读取文件，然后在写入模式下打开它，并且只写入在开始时没有该代码的行。

//Open in read mode 
f = open("yourfile.txt","r") 
lines = f.readlines() 
f.close() 
//if code is 8 
code = 8 
//Open in write mode 
f = open("yourfile.txt","w") 

for line in lines: 
    arr = line.split('\t') 
    if arr[0]!=code: //Check for the code to avoid 
    f.write(line) 

f.close()