打開並寫入文件

Question

我創建了一個代碼，要求用戶在純文本文件中輸入位置列表，將用戶在文本文件中輸入的位置保存爲列表，而不是要求用戶在每個位置輸入單詞代表（與位置列表相同的順序）結束重新創建句子。 但我不知道什麼事情：

1）我怎樣才能使純文本文件彈出只有當前一個關閉（所以只有當文件：list_of_numbers已關閉，其他文件list_of_words將彈出）。

2）如何將輸出寫入純文本文件。

這裏是代碼：

import subprocess 
subprocess.Popen(["notepad","list_of_numbers.txt"]) 
with open("list_of_numbers.txt","r") as pos_file: 
    positions = pos_file.read().spllit() 

subprocess.Popen(["notepad","list_of_words.txt"]) 
with open("list_of_words.txt","r") as sentence_file: 
    words = sentence_file.read().split() 

mapping = dict(zip(positions, words)) 
output = [mapping[position] for position in positions] 

print(' '.join(output)) 

Answer 1

林不知道你正在嘗試做的完全是，但是這應該幫助。你並不需要使用子進程，而事實上它可能是一些過於複雜的事情......

輸入：

Enter a number. (Leave blank to continue): 1 
Enter a number. (Leave blank to continue): 2 
Enter a number. (Leave blank to continue): 3 
Enter a number. (Leave blank to continue): 


Enter a word. (Leave blank to continue): a 
Enter a word. (Leave blank to continue): b 
Enter a word. (Leave blank to continue): c 
Enter a word. (Leave blank to continue): 

輸出（控制檯和OUTPUT.TXT）：

1, a 

2, b 

3, c 

代碼：

#!/usr/bin/env python 

while True: 

    positions = [] 
    words = [] 

    while True: 
     number = raw_input("Enter a number. (Leave blank to continue): ") 
     if not number: 
      break 

     try: 
      positions.append(int(number)) 
     except TypeError: 
      print("Invalid number provided. Try again.") 

    print("\n") 

    while True: 
     word = raw_input("Enter a word. (Leave blank to continue): ") 
     if not word: 
      break 

     words.append(word) 

    if len(positions) != len(words): 
     print("You did not enter the same number of words and positions..") 
     print("Clearing previous inputs..") 
    else: 
     break 

with open("output.txt", 'a') as output_file: 
    for x in xrange(0, len(positions)): 
     line = "{0}, {1}\n".format(positions[x], words[x]) 
     output_file.write(line) 
     print(line) 

Answer 2

通過查閱Python文檔瞭解如何實現這一點並不成問題。
- Popen
- Reading and Wirting Files

---

不失！ - 如果你創建一個對象，那麼你應該把它分配給一個變量！

# DO 
process = subprocess.Popen(["notepad","list_of_numbers.txt"]) 

# DONT 
subprocess.Popen(["notepad","list_of_numbers.txt"]) 

---

諮詢Python文檔應該帶你到這樣一個解決方案：

import subprocess 

# don't do anything unless child process has been terminated 
with subprocess.Popen(["notepad","list_of_numbers.txt"]) as process: 
    pass # you could leave this line blank but using pass clearer 

with open("list_of_numbers.txt","r") as pos_file: 
    positions = pos_file.read().split() 

process = subprocess.Popen(["notepad","list_of_words.txt"]) 

with open("list_of_words.txt","r") as sentence_file: 
    words = sentence_file.read().split() 

mapping = dict(zip(positions, words)) 
output = [mapping[position] for position in positions] 

# open a new file in write mode, write data and close the file 
with open('new_file.txt', 'w') as f: 
    f.write(' '.join(output)) 

注意：您仍然需要修復你的任務，以mapping和output在17行和18，因爲它們不會產生預期的結果，但這不是你問題的一部分。