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

1.open you must remember to call the close () method of the file object when you open the file using open. For example, you can use the Try/finally statement to ensure that the file is finally closed.

File_object = open (' thefile.txt ')
try:
 all_the_text = File_object.read ()
finally:
 file_ Object.close ()

Note: The Open statement cannot be placed in a try block because the close () method cannot be executed by the file object File_object when an exception is opened.

2. read file read text file input = open (' Data ', ' R ')

#第二个参数默认为r
input = 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 fixed byte file_object = open (' Abinfile ', ' RB ')

Try: While
 True:
 chunk = File_object.read (m)
 if not chunk:
 break
 Do_something_with (chunk )
finally:
 file_object.close ()

Read each line list_of_all_the_lines = File_object.readlines ()

If the file is a text file, you can also traverse the file object to get each line:

For line in File_object:
 process Line

3. write file write 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 ("All have good people")

output. Close ()

Write Data File_object = open (' Thefile.txt ', ' W ')

File_object.write (All_the_text)
file_object.close ()

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