打开并写入文件

我创建了一个代码，要求用户在纯文本文件中输入位置列表，将用户在文本文件中输入的位置保存为列表，而不是要求用户在每个位置输入单词代表（与位置列表相同的顺序）结束重新创建句子。但我不知道什么事情：打开并写入文件

1）我怎样才能使纯文本文件弹出只有当前一个关闭（所以只有当文件：list_of_numbers已关闭，其他文件list_of_words将弹出）。

2）如何将输出写入纯文本文件。

这里是代码：

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))

来源

2017-03-31 john smith

林不知道你正在尝试做的完全是，但是这应该帮助。你并不需要使用子进程，而事实上它可能是一些过于复杂的事情......

输入：

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):

输出（控制台和OUTPUT.TXT）：

1, a 

2, b 

3, c

代码：

#!/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)

来源

2017-03-31 16:50:50 cmeadows

他使用Python3。 '尝试 - 除了'附加？自从什么时候追加提出任何异常？ – DahliaSR

@DahliaSR'try-except'不适用于'.append（）'，它适用于'int（）' - 在用户输入非整数的情况下，它不能被转换为int。（注意，它并不存在“while”字样下。此外，更新了Python 3的打印语句。我错过了！ – cmeadows

通过查阅Python文档了解如何实现这一点并不成问题。
- Popen
- Reading and Wirting Files

不失！ - 如果你创建一个对象，那么你应该把它分配给一个变量！

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

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

咨询Python文档应该带你到这样一个解决方案：

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：您仍然需要修复你的任务，以mapping和output在17行和18，因为它们不会产生预期的结果，但这不是你问题的一部分。

来源

2017-03-31 17:21:05 DahliaSR

打开并写入文件

回答

相关问题