Append Text to Existing File :

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

# Read after appending
f = open("demofile2.txt", "r")
print(f.read())
f.close()

Output :

Overwrite File Content Using Write Mode :

f = open("demofile3.txt", "w")
f.write("Woops! I have deleted the content!")
f.close()

# Read after overwriting
f = open("demofile3.txt", "r")
print(f.read())
f.close()

Output :

Create New File Using Create Mode :

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

Output :

Create File Using Write Mode :

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

Output :