Python file operations, open read/write files, append text content instances,

Python file operations, open read/write files, append text content instances,

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 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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