如何在Python字典中的迭代中打印当前循环号？

Question

I have a dictionary

>>>d = {"a":"apple", "c":"cat", "d":"dog"}

That dictionary should be printed to output in this particular format:

1. apple
2. cat
3. dog

If I have to use list comprehension to do so, how would I go about getting it to also print the current iteration number ie 1 or 2 or 3 as per above output.

This is what I have so far and it just prints the dict values on newlines, but it is far from what I want.

>>>temp =  "\n".join( [d[i] for i in d] )
>>>print temp

• Also, is it beneficial to use a generator instead of list comprehension here?
• Enviroment: Python 2.7

Answer 1

In [90]: for i,arr in enumerate(d.values(), 1):
   ....:     print i, arr
   ....:     
   ....:     

1 apple
2 cat
3 dog

Answer 2

Sorted by value:

print '\n'.join('{}. {}'.format(i, d[k]) for (i,k) in enumerate(sorted(d, key=d.get), 1))
1. apple
2. cat
3. dog

---

Sorted by key:

>>> print '\n'.join('{}. {}'.format(i, d[k]) for (i,k) in enumerate(sorted(d), 1))
1. apple
2. cat
3. dog

---

Unsorted (results will come out however dict feels like giving them)

>>> print '\n'.join('{}. {}'.format(i, v) for (i,v) in enumerate(d.itervalues(), 1))
1. apple
2. cat
3. dog

Answer 3

Simple dictionary iteration code will do this. See the string formatting as well to pint out the location exactly as requested.

d = {"a":"apple", "c":"cat", "d":"dog"}

count=1
for k,v in d.iteritems():
   print "%s. %s" % (count, k)
   count +=1