Python：逐行将文本写入文件


Python : write text to file line by line

本问题已经有最佳答案，请猛点这里访问。

我正在尝试将一些文本写入一个文件，下面是我的尝试：

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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)

我得到一个空文件。我该怎么做？

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这是如何打印到TXT文件：

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

另一种方法是：

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

这是我编写的一个用于写入TXT文件的程序：

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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

")
        start()


def create():

    print()
    filename = input("What do you want the file to be called?
")
    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("
")
        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

")
        start()
    else:
        print("Error")


start()
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通过这种方式，您应该直接关闭文件：

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

这样，在with完成执行后，文件在缩进块后关闭：

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

更多信息：

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

您提供的代码将生成一个名为file的文件，其中包含所需的行。也许您打算将其保存为"file.txt"。另外，'wb'标志中的'b'指示代码以二进制模式写入文件(此处提供更多信息)。如果您希望文件可读，可以尝试使用'w'。

最后，在访问文件时使用with语句是最佳实践。

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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)

writelines需要一个不可重复的行(例如一个列表)，所以不要使用它。您需要关闭文件以保存更改，最好使用with语句：

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