存儲基於計算機的輸入並在命令中更改存儲的輸入

Question

固定代碼;

if os.path.isfile(external_file): 
    with open(external_file) as in_f: 
     name = in_f.read() 
else: 
    name = raw_input("What's your name?") 
    with open(external_file, "w") as out_f: 
     out_f.write(name) 

問題是。

它指的是每個使用它的計算機，其名稱以.txt存儲。 我需要爲每個MAC地址/ IP /計算機

我還需要名字不同.TXT從用戶

而且在命令改變，如果沒有名稱爲.txt它不請求名字？

Answer 1

您可以嘗試這樣做，首先簡單地詢問用戶的名稱，然後檢查文件names.txt是否存在，如果不存在，則創建名稱爲names.txt的新文件並將用戶名添加到它。如果文件存在，現在檢查它是否包含用戶名，如果它包含然後說'Hi + name'，否則將名稱追加到文件。

這裏是一個快速和骯髒的修復您的代碼（可以進一步提高！）：

import os 
#hard code the path to the external file 
external_file = 'names.txt' 
#Ask the user's name 
name = raw_input("What's your name?") 
#if file exists, use it to load name, else create a new file 
if not os.path.exists(external_file): 
    with open(external_file, "a") as f: # using "a" will append to the file 
     f.write(name) 
     f.write("\n") 
     f.close() 
else: 
    #if file exists, use it to load name, else ask user 
    with open(external_file, "r+") as f:# r+ open a file for reading & writing 
     lines = f.read().split('\n') # split the names 
     #print lines 
     if name in lines: 
      print "Hi {}".format(name) 
     else: 
      f.seek(0,2) # Resolves an issue in Windows 
      f.write(name) 
      f.write("\n") 
      f.close() 

更新：修改的版本檢查僅harcoded名稱：

import os 
#hard code the path to the external file 
external_file = 'names.txt' 
username = 'testuser'# Our hardcoded name 

#if file doesn' exists, create a new file 
if not os.path.exists(external_file): 
    #Ask the user's name 
    name = raw_input("What's your name?") 
    with open(external_file, "a") as f: # using "a" will append to the file 
     f.write(name)# Write the name to names.txt 
     f.write("\n") 
     f.close() 
else: 
    #if file exists, use it to load name, else ask user 
    with open(external_file, "r+") as f:# r+ open a file for reading & writing 
     lines = f.read().split('\n') # split the names 
     print lines 
     if username in lines: #Check if the file has any username as 'testuser' 
      print "Hi {}".format(username) 
     else: # If there is no username as 'testuser' then ask for a name 
      name = raw_input("What's your name?") 
      f.seek(0,2) # Resolves an issue in Windows 
      f.write(name)# Write the name to names.txt 
      f.write("\n") 
      f.close() 

使用file.seek()的原因是here。