R7.1 What happens if you try to open a file for reading that doesn’t exist? What happens if you try to
open a file for writing that doesn’t exist?
An IOError occurs if you try to open a reading file that doesn’t exist. A new file will be created when
you try to open a writing file that doesn’t exist.
R7.2 What happens if you try to open a file for writing, but the file or device is write-protected
(sometimes called read-only)? Try it out with a short test program.
The program will have a PermissionError
R7.3 How do you open a file whose name contains a backslash, like c:\temp\output.dat?
You provide the backslash twice instead of once.
R7.4 If a program Woozle is started with the command
python woozle.py -Dname=piglet -Ieeyore -v heff.txt a.txt lump.txt
what are the values of argv[0], argv[1], and so on?
argv[0] =woozle.py
argv[1] =-Dname=piglet
argv[2] =-Ieeyore
argv[3] =-v
argv[4]=heff.txt
argv[5] =a.txt
argv[6]=lump.txt
R7.5 What is the difference between raising an exception and handling an exception?
Raising an exception= when you detect an error condition raise an exception
Handling an exception= passing control from the point of error detection to a handler
R7.6 When your program executes a raise statement, which statement is executed next?
The first except statement that processes that type of exception
R7.7 What happens if an exception does not have a matching except clause?
It is passes to outer try statements
If no handler is found , program stops with an error message
R7.8 What can your program do with the exception object that an except clause receives?
You can store the exception object in a variable and do anything with it
R7.9 What is the difference between sequential access and random access?
Sequential access- program reads/write to the file from the beginning to the end
Random Access- program reads/writes info to the file anywhere in the data file
R7.10 What is the difference between a text file and a binary file?
A text file - alphabets, digits and other special characters
A binary file- bytes
Horstmann, C. S., Necaise, R. D. (11/2018). Python For Everyone, Enhanced eText, 3rd Edition
[VitalSource Bookshelf version]. Retrieved from vbk://9781119498537