Example of using a Python file to append text content to an open read/write file

1. after open is used to open a file, remember to call the close () method of the file object. For example, you can use the tryfinally statement to ensure that the file can be closed at last. File_objectopen(thefile.txt) try: all_the_textfile_object.read () finally: file_object.close () Note: The open statement cannot be placed in the try block, because when the file is opened, the exception 1 occurs. after opening a file using open, remember to call the close () method of the file object. For example, you can use the try/finally statement to ensure that the file can be closed at last.

file_object = open('thefile.txt')try: all_the_text = file_object.read( )finally: file_object.close( )

Note: The open statement cannot be placed in the try block, because when an exception occurs when the file is opened, the file object file_object cannot execute the close () method.
2. read the text file input = open ('data', 'r ')

# The second parameter defaults to rinput = open ('data ')

Read binary file input = open ('data', 'RB ')
Read all content file_object = open('thefile.txt ')

try: all_the_text = file_object.read( )finally: file_object.close( )

Read the fixed byte file_object = open ('abinfile', 'RB ')

try: while True: chunk = file_object.read(100) if not chunk: break do_something_with(chunk)finally: file_object.close( )

Read each row list_of_all_the_lines = file_object.readlines ()
If the file is a text file, you can directly traverse the file object to get each line:

for line in file_object: process line

3. write a file to write a text file. output = open('data.txt ', 'w ')
Write binary file output = open('data.txt ', 'WB ')
Append write file output = open('data.txt ', 'A ')

Output. write ("\ n are good guys") output. close ()

Write data file_object = open('thefile.txt ', 'w ')

file_object.write(all_the_text)file_object.close( )

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