的Python：寫文一行

Question

我想寫一些文字到文件中，並在這裏提交線是我的嘗試：

text ="Lorem Ipsum is simply dummy text of the printing and typesetting " \ 
        "industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s," \ 
        " when an unknown printer took a galley of type and scrambled it to make a type specimen book." 
target = open("file", 'wb') 
target.writelines(text) 

，我得到一個空文件。 我該怎麼做？

Answer 1

這是如何打印到一個txt文件：

file = open("Exported.txt", "w") 
file.write("Text to write to file") 
file.close() #This close() is important 

另一種方式來做到這一點會是：

with open('Exported.txt', 'w') as file: 
    file.write("Text to write to file") 

這是我做了寫一個txt文件的程序：

import os.path 

def start(): 

    print("What do you want to do?") 
    print(" Type a to write a file") 
    print(" Type b to read a file") 
    choice = input("   -") 
    if choice == "a": 
     create() 
    elif choice == "b": 
     read() 
    else: 
     print("Incorrect spelling of a or b\n\n") 
     start() 


def create(): 

    print() 
    filename = input("What do you want the file to be called?\n") 
    if os.path.isfile(filename): 
     print("This file already exists") 
     print("Are you sure you would like to overwrite?") 
     overwrite = input("y or n") 
     if overwrite == "y": 
      print("File has been overwritten") 
      write(filename) 
     else: 
      print("I will restart the program for you") 
    elif not os.path.isfile(filename): 
     print("The file has not yet been created") 
     write(filename) 
    else: 
     print("Error") 





def write(filename): 
    print() 
    print("What would you like the word to end writing to be?") 
    keyword = input() 
    print("What would you like in your file?") 
    text = "" 
    filename = open(filename, 'w') 
    while text != keyword: 
     filename.write(text) 
     filename.write("\n") 
     text = input() 


def read(): 
    print() 
    print("You are now in the reading area") 
    filename = input("Please enter your file name:  -") 
    if os.path.isfile(filename): 
     filename = open(filename, 'r') 
     print(filename.read()) 
    elif not os.path.isfile(filename): 
     print("The file does not exist\n\n") 
     start() 
    else: 
     print("Error") 


start() 

Answer 2

writelines需要一個可迭代（例如列表）的行，所以不要使用它。而你需要關閉該文件保存更改，這是最好用with語句來完成：

with open("file", 'wb') as target: 
    target.write(text) 

Answer 3

您提供的代碼使用所需的行生成名爲file的文件。也許你打算把它保存爲「file.txt」。另外，'wb'標誌中的'b'通知代碼以二進制模式寫入文件（更多信息here）。如果您希望文件可讀，請嘗試使用'w'。

最後是最好的做法，以訪問文件

text ="Lorem Ipsum is simply dummy text of the printing and typesetting " \ 
       "industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s," \ 
       " when an unknown printer took a galley of type and scrambled it to make a type specimen book." 
with open("file.txt", 'w') as f: 
    f.write(text) 

Answer 4

時，通過這種方式使用with語句，你應該直接關閉文件：

target = open("filename.txt", 'w') 
target.writelines(text) 
target.close() 

通過這種方式縮進後的文件關閉with執行完成後的塊：

with open("filename.txt", "w") as fh: 
    fh.write(text) 

更多信息：

• http://www.python-course.eu/python3_file_management.php