Python File write() Method
Example
Open the file with "a" for appending, then add some text to the file:
    f = open("demofile2.txt", "a")
f.write("See 
    you soon!")
f.close()
#open 
    and read the file after the appending:
f = open("demofile2.txt", "r")
    print(f.read())
  Run example »
Definition and Usage
The write() method writes a specified text 
to the file.
Where the specified text will be inserted depends on the file mode and stream position.
"a":  The text will be inserted at the current file stream position, 
default at the end of the file.
"w": The file will be emptied before the text will be inserted at the current 
file stream position, default 0.
Syntax
  
    file.write(byte)
  
Parameter Values
| Parameter | Description | 
|---|---|
| byte | The text or byte object that will be inserted. | 
More examples
Example
The same example as above, but inserting a line break before the inserted text:
    f = open("demofile2.txt", "a")
f.write("\nSee 
    you soon!")
f.close()
#open 
    and read the file after the appending:
f = open("demofile2.txt", "r")
    print(f.read())
  Run example »

