Final answer:
A program fragment to open a file for writing involves using Python's input function to take the filename from the user and the open function to open the file in write mode. Error handling is implemented using a try-except block to catch any I/O errors.
Step-by-step explanation:
To write a program fragment to read a filename from the user and open the file for writing, you can use the following Python code snippet:
filename = input('Enter the filename to open for writing: ')
try:
with open(filename, 'w') as file:
print(f'File {filename} opened for writing successfully.')
# Write operations here
except IOError:
print('An error occurred while opening the file.')
This code first asks the user to input the filename. It then tries to open the file in write mode ('w'). If successful, it confirms the file is open and ready for writing. In case of an I/O error, like the file not being accessible for writing, it prints an error message.