[Tutor] Directory operation: why so darn slow?

[Johannes Graumann]

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Hello,

I have a class that spits out a dictionary ('contrast.data()') and I have two major problems with it:

1) the operation represented by the snippet below is ridiculisly slow (didn't use to be - before I had a several level deep dictionary) - is there anything I can do about that?

repres_filtered = {}
for dataset in contrast.data()['conform'].keys():
 seqcov_count = 0
  for element in contrast.data()['conform'][dataset]['seqcov']:
   if re.match(r"\d+",element):
    seqcov_count = seqcov_count + 1
  if not seqcov_count < repres:
   repres_filtered[dataset]=contrast.data()['conform'][dataset]

2) does the fact that the dictionary is created by the class imply that I can not change it (delete it)? I would prefer to do something like

for dataset in contrast.data()['conform'].keys():
 seqcov_count = 0
  for element in contrast.data()['conform'][dataset]['seqcov']:
   if re.match(r"\d+",element):
    seqcov_count = seqcov_count + 1
  if not seqcov_count < repres:
   del contrast.data()['conform'][dataset]

Thanks for any hint!

Joh

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