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How to write data to a txt file: 1. Use the open() function to open the txt file in writing mode, the syntax "file_handle=open('txt file', mode='w')"; 2 , Use the write() or writelines() function to write data to the open file, the syntax is "file_handle.write(data)" or "file_handle.writelines(data)"; 3. Use the close() function to close the file.
The operating environment of this tutorial: windows7 system, python3 version, DELL G3 computer.
Python writes data to a txt text file:
Step 1. Open the txt file
file_handle=open('1.txt',mode='w')
python open() The function is used to open a file and create a file object. Only related methods can be called to read and write.
open() parameters include (1. file name, mode mode)
The mode mode has the following types:
| Mode | Description |
|---|---|
| t | Text mode (default). |
| x | Write mode, create a new file, if the file already exists, an error will be reported. |
| b | Binary mode. |
| Open a file for update (readable and writable). | |
| U | Universal newline mode (not recommended). |
| #r | Open the file read-only. The file pointer will be placed at the beginning of the file. This is the default mode. |
| rb | Open a file in binary format for reading only. The file pointer will be placed at the beginning of the file. This is the default mode. Generally used for non-text files such as pictures, etc. |
| r | Open a file for reading and writing. The file pointer will be placed at the beginning of the file. |
| #rb | Open a file in binary format for reading and writing. The file pointer will be placed at the beginning of the file. Generally used for non-text files such as pictures, etc. |
| w | Open a file for writing only. If the file already exists, open the file and start editing from the beginning, that is, the original content will be deleted. If the file does not exist, create a new file. |
| wb | Open a file in binary format for writing only. If the file already exists, open the file and start editing from the beginning, that is, the original content will be deleted. If the file does not exist, create a new file. Generally used for non-text files such as pictures, etc. |
| w | Open a file for reading and writing. If the file already exists, open the file and start editing from the beginning, that is, the original content will be deleted. If the file does not exist, create a new file. |
| wb | Open a file in binary format for reading and writing. If the file already exists, open the file and start editing from the beginning, that is, the original content will be deleted. If the file does not exist, create a new file. Generally used for non-text files such as pictures, etc. |
| a | Open a file for appending. If the file already exists, the file pointer will be placed at the end of the file. In other words, new content will be written after existing content. If the file does not exist, create a new file for writing. |
| ab | Open a file in binary format for appending. If the file already exists, the file pointer will be placed at the end of the file. In other words, new content will be written after existing content. If the file does not exist, create a new file for writing. |
| a | Open a file for reading and writing. If the file already exists, the file pointer will be placed at the end of the file. The file will be opened in append mode. If the file does not exist, a new file is created for reading and writing. |
| ab | Open a file in binary format for appending. If the file already exists, the file pointer will be placed at the end of the file. If the file does not exist, a new file is created for reading and writing. |
步骤2、向文件写入数据
第一种写入方式：
# 2.1 write 写入 #\n 换行符 file_handle.write('hello word 你好 \n')
write() 方法将指定的文本写入文件。指定的文本将插入的位置取决于文件模式和流位置。
"a"：文本将插入当前文件流的位置，默认情况下插入文件的末尾。
"w"：在将文本插入当前文件流位置（默认为 0）之前，将清空文件。
第二种写入方式：
# 2.2 writelines()函数 #参数 必须是一个只存放字符串的列表 file_handle.writelines(['hello\n','world\n','你好\n','智游\n','郑州\n'])
writelines() 方法用于向文件中写入一序列的字符串。
这一序列字符串可以是由迭代对象产生的，如一个字符串列表。
writelines() 方法不会自动换行，如果需要换行，手动添加换行符 \n。
步骤3、关闭文件
file_handle.close()
close() 函数是专门用来关闭已打开文件的。
对于使用 open() 函数打开的文件，我们必须用 close() 函数将其手动关闭。因为文件在打开并操作完成之后，就应该及时关闭，否则程序的运行可能出现问题。
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