的Python - 刪除文件全線使用特定的數據

Question

我來這裏是因爲我耗盡了我所有的資源來建造這個節目......

我想刪除使用特定的數據這樣

一個文件的行

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

我想刪除基於代碼

整行，如果我鍵入鱈魚e，* .py將搜索包含此字符串的行，並將其刪除。

任何好的靈魂能幫助我嗎？

Answer 1

假設下面的輸入（上generatedata.com產生）並被保存爲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 

下面的代碼將刪除符合代碼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中會：

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，腳本的運行可能需要更多的時間我和資源。

Answer 2

您可以讀取文件，然後在寫入模式下打開它，並且只寫入在開始時沒有該代碼的行。

//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()