2,306
edits
Changes
Jump to navigation
Jump to search
Line 109:
Line 109: − This can be used to sort dictionaries by keys.+ Line 119:
Line 119: + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
→Tuple
True
True
</source>
</source>
'''To sort dictionaries by keys.'''
<source lang="python">
<source lang="python">
>>> d = {'c':22, 'b':1, 'a':10}
>>> d = {'c':22, 'b':1, 'a':10}
[('a', 10), ('b',1), ('c', 22)]
[('a', 10), ('b',1), ('c', 22)]
</source>
</source>
'''To sort by value:'''
<source lang="python">
c = {'c':22, 'b':1, 'a':10}
tmp = list()
for k, v in c.items():
tmp.append( (v, k) )
tmp.sort(reverse = True)
print tmp
[(22, 'c'), (10, 'a'), (1, 'b')]
</source>
'''The same sort by value with list comprehension'''
<source lang="python">
c = {'c':22, 'b':1, 'a':10}
print sorted( [ (v,k) for k,v in c.items() ] )
</source>
<br />
'''Top 10 most common words.'''
<source lang="python">
fhand = open('romeo.txt')
counts = dict()
for line in fhand:
words = line.split()
for word in words:
counts[word] = counts.get(word, 0) +1
lst = list()
for key, val in counts.items():
lst.append((val, key))
lst.sort(reverse = True)
for val, key in lst[:10]
print key, val
</source>
==== Dictionary ====
==== Dictionary ====
Key - Value pairs. They are called diferent in diferent languages:<br />
Key - Value pairs. They are called diferent in diferent languages:<br />