why print out wrong result. python enumerate, counter -

# -*- coding: utf-8 -*- collections import counter import itertools, collections listea=['it', 'was', 'the', 'besttttttttttttttrtrtrtrtrttrtr', 'of', 'times', 'it', 'was',         'the', 'worst', 'of', 'times', 'it', 'was', 'the', 'age', 'xx', 'xx', 'xx', 'xx', 'xx', 'xx', 'xx', 'xx', 'xx', 'xx'         'of', 'wisdom', 'it', 'was', 'the', 'age', 'of', 'xx'         'foolishness']  index = collections.defaultdict(list);  value, key in enumerate(listea):     index[key].append(value)  key1,value1 in index.items():      if len(value1)>=4:            print value1 

output not correct. problem code. output seems

[0, 6, 12, 27] [16, 17, 18, 19, 20, 21, 22, 23, 24] [2, 8, 14, 29] [1, 7, 13, 28] 

i add number read easy listea=[0'it', 1'was', 2'the', 3'besttttttttttttttrtrtrtrtrttrtr', 4'of', 5'times', 6'it', 7'was', 8'the', 9'worst', 10'of', 11'times', 12'it', 13'was', 14'the', 15'age', 16'xx', 17'xx', 18'xx', 19'xx', 20'xx', 21'xx', 22'xx', 23'xx', 24'xx', 25'xx' 26'of', 27'wisdom', 28'it', 29'was', 30'the', 31'age', 32'of', 33'xx' 34'foolishness']

you're missing commas @ end of lines make list.

since list items string literals, end 2 items next each other no syntax between them. little known feature in python adjacent string literals concatenated. "foo" "bar" same string "foobar". can span newlines too, long newline doesn't end expression (usually because it's inside parentheses or brackets of kind).

the issue means you'll have "xxof" , "xxfoolishness" in data, rather separate "xx" (twice), "of" , "foolishness" strings. may throw off expected count.

to fix issue, add commas @ end of lines they've been missed:

listea=['it', 'was', 'the', 'besttttttttttttttrtrtrtrtrttrtr', 'of', 'times', 'it', 'was',     'the', 'worst', 'of', 'times', 'it', 'was', 'the', 'age', 'xx', 'xx',     'xx', 'xx', 'xx', 'xx', 'xx', 'xx', 'xx', 'xx', # add comma here     'of', 'wisdom', 'it', 'was', 'the', 'age', 'of', 'xx', # , here     'foolishness'] 

in addition commas, added newline break longest line @ at earlier point whole thing more fit on screen @ once (with no horizontal scroll bar). pep 8 recommends lines of code no longer 79 characters long, or 72 characters docstrings , comments can rearranged in way want. that's strict requirement code contributed python (e.g. fixes standard library), many people try follow pep 8 in own code, , many other python style guides have length limits (though they're bit more generous exact number of characters).