python file write

Write to an Existing File

To write to an existing file, you must add a parameter to the

open() function:

"a" - Append - will append to the end of the file

"w" - Write - will overwrite any existing content

Example

Open the file "demofile2.txt" and append content to the file:



f = open("demofile2.txt", "a")f.write("Now the file has more content!")

f.close()#open and read the file after the appending:f =

open("demofile2.txt", "r")print(f.read())

Run Example »

Example

Open the file "demofile2.txt" and append content to the file:

Example

Open the file "demofile3.txt" and overwrite the content:



f = open("demofile3.txt", "w")

f.write("Woops! I have deleted the content!")f.close()

#open and read the file after the appending:f = open("demofile3.txt", "r")

print(f.read())

Run Example »

Example

Open the file "demofile3.txt" and overwrite the content:

Note: the "w" method will overwrite the entire file.

Create a New File

To create a new file in Python, use the open() method,

with one of the following parameters:

"x" - Create - will create a file, returns

an error if the file exist

"a" - Append - will create a file if the

specified file does not exist

"w" - Write - will create a file if the

specified file does not exist

Example

Create a file called "myfile.txt":



f = open("myfile.txt", "x")

Example

Create a file called "myfile.txt":

Result: a new empty file is created!

Example

Create a new file if it does not exist:



f = open("myfile.txt", "w")

Example

Create a new file if it does not exist: