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files and exceptions

Take a pass on the error

With this data (and this program), it is best if you ignore lines that don’t
conform to the expected format. If the call to the split() method causes
an exception, let’s simply pass on reporting it as an error.
When you have a situation where you might be expected to provide code, but
don’t need to, use Python’s pass statement (which you can think of as the
empty or null statement.)

Here’s the pass statement combined with try:

data = open('sketch.txt')

for each_line in data:
try:
This code is (role, line_spoken) = each_line.split(':', 1)
protected from print(role, end='')
runtime errors.
print(' said: ', end='')
print(line_spoken, end='')
except:
If a runtime error
pass occurs, this code is
executed.

data.close()

Now, no matter what happens when the split() method is invoked, the
try statement catches any and all exceptions and handles them by ignoring the
error with pass.

Let’s see this code in action. Do this!

Make the required changes
to your code in the IDLE
edit window.

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