Why is they a error.

Question

I am trying to do a Note pad project. But there is an error. The error is io.UnsupportedOperation. Here is the code.

file = open("Text_Stuff.txt")
print("Welcome to Note pad\n")
print("Here you can put text in your Note pad\n")

while True:
input1 = input("Please enter what do you want to do? See/Edit/Delete ")
if input1 == "See":
print(file.read())
elif input1 == "Edit":
input2 = input("\nPlease enter what do you want to put in the Note pad ")
file.write(input2)
print("\nYou have successfully rewrite the content of Note pad")
elif input1 == "Delete":
file.write("")
print("\nYou have successfully delete all of the content of Note pad")
else:
print("\nUmm I think you type the command")

Answer 1

Alvin Phyo Htet ,

there are 2 other issues with the code:

-> when a file was opened and used, we have to close the file before the program is terminated. otherwise we may loose the file content.

-> the while loop is an infinite loop, so we can not terminate the programm in a controlled manner. we need to implement an "end" option by using a break statement.

Answer 2

When you open file , it is opened in read only and text mode by default. Write operation will give you the above error.

If you want to open it in read and write mode , use "a+" mode (i.e. open("Text_Stuff.txt", "a+"))

More on what a+ and other modes do, https://www.programiz.com/JUMP_LINK__&&__python__&&__JUMP_LINK-programming/file-operation#:~:text=Opening%20Files%20in%20Python,or%20modify%20the%20file%20accordingly.&text=We%20can%20specify%20the%20mode,append%20a%20to%20the%20file.