continue vs. pass in this IO reading and writing
tjreedy at udel.edu
Thu Sep 3 18:05:28 CEST 2015
On 9/3/2015 11:05 AM, kbtyo wrote:
> I am experimenting with many exception handling and utilizing continue vs pass.
'pass' is a do-nothing place holder. 'continue' and 'break' are jump
> However, I am uncertain as to how this executes in a context like this:
> import glob
> import csv
> from collections import OrderedDict
> interesting_files = glob.glob("*.csv")
> header_saved = False
> with open('merged_output_mod.csv','w') as fout:
> for filename in interesting_files:
> print("execution here again")
> with open(filename) as fin:
> header = next(fin)
> print("Entering Try and Except")
> if not header_saved:
> header_saved = True
> print("We got here")
> for line in fin:
> My questions are (for some reason my interpreter does not print out any readout):
> 1. after the exception is raised does the continue return back up to the beginning of the for loop (and the "else" conditional is not even encountered)?
> 2. How would a pass behave in this situation?
Try it for yourself. Copy the following into a python shell or editor
(and run) see what you get.
for i in [-1, 0, 1]:
j = 2//i
Change 'continue' to 'pass' and run again.
Terry Jan Reedy
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