Vfrdtyky

Hmm, I think that what you might be wanting to do is print all the keys in the dictionary and their respective values?

If so you want the following:

for key in mydic:

  print "the key name is" + key + "and its value is" + mydic[key]

Make sure you use +'s instead of ,' as well. The comma will put each of those items on a separate line I think, where as plus will put them on the same line.

Additionally you can use....

print(dictionary.items()) #prints keys and values

print(dictionary.keys()) #prints keys

print(dictionary.values()) #prints values

dic = {"key 1":"value 1","key b":"value b"}



#print the keys:

for key in dic:

    print key



#print the values:

for value in dic.itervalues():

    print value



#print key and values

for key, value in dic.iteritems():

    print key, value

Note:In Python 3, dic.iteritems() was renamed as dic.items()

The name of the key 'key_name' is key_name, therefore print 'key_name' or whatever variable you have representing it.

Since we're all trying to guess what "print a key name" might mean, I'll take a stab at it. Perhaps you want a function that takes a value from the dictionary and finds the corresponding key? A reverse lookup?

def key_for_value(d, value):

    """Return a key in `d` having a value of `value`."""

    for k, v in d.iteritems():

        if v == value:

            return k

Note that many keys could have the same value, so this function will return some key having the value, perhaps not the one you intended.

If you need to do this frequently, it would make sense to construct the reverse dictionary:

d_rev = dict(v,k for k,v in d.iteritems())

Or you can do it that manner:

for key in my_dict:

     print key, my_dict[key]

What's wrong with using 'key_name' instead, even if it is a variable?

import pprint

pprint.pprint(mydic.keys())

# highlighting how to use a named variable within a string:

dict = {'a': 1, 'b': 2}



# simple method:

print "a %(a)s" % dict

print "b %(b)s" % dict



# programmatic method:

for key in dict:

    val = '%('+key+')s'

    print key, val % dict



# yields:

# a 1

# b 2



# using list comprehension

print "n".join(["%s: %s" % (key, ('%('+key+')s') % dict) for key in dict])



# yields:

# a: 1

# b: 2

dict = {'name' : 'Fred', 'age' : 100, 'employed' : True }



# Choose key to print (could be a user input)

x = 'name'



if x in dict.keys():

    print(x)

Probably the quickest way to retrieve only the key name:

mydic = {}

mydic['key_name'] = 'value_name'



print mydic.items()[0][0]

Result:

key_name

Converts the dictionary into a list then it lists the first element which is the whole dict then it lists the first value of that element which is: key_name

Make sure to do

dictionary.keys()

# rather than

dictionary.keys

In Python 3:

# A simple dictionary

x = {'X':"yes", 'Y':"no", 'Z':"ok"}



# To print a specific key (for example key at index 1)

print([key for key in x.keys()][1])



# To print a specific value (for example value at index 1)

print([value for value in x.values()][1])



# To print a pair of a key with its value (for example pair at index 2)

print(([key for key in x.keys()][2], [value for value in x.values()][2]))



# To print a key and a different value (for example key at index 0 and value at index 1)

print(([key for key in x.keys()][0], [value for value in x.values()][1]))



# To print all keys and values concatenated together

print(''.join(str(key) + '' + str(value) for key, value in x.items()))



# To print all keys and values separated by commas

print(', '.join(str(key) + ', ' + str(value) for key, value in x.items()))



# To print all pairs of (key, value) one at a time

for e in range(len(x)):

    print(([key for key in x.keys()][e], [value for value in x.values()][e]))



# To print all pairs (key, value) in a tuple

print(tuple(([key for key in x.keys()][i], [value for value in x.values()][i]) for i in range(len(x))))

Try this:

def name_the_key(dict, key):

    return key, dict[key]



mydict = {'key1':1, 'key2':2, 'key3':3}



key_name, value = name_the_key(mydict, 'key2')

print 'KEY NAME: %s' % key_name

print 'KEY VALUE: %s' % value

key_name = '...'

print "the key name is %s and its value is %s"%(key_name, mydic[key_name])

If you want to get the key of a single value, the following would help:

def get_key(b): # the value is passed to the function

    for k, v in mydic.items():

        if v.lower() == b.lower():

            return k

In pythonic way:

c = next((x for x, y in mydic.items() if y.lower() == b.lower()), 

     "Enter a valid 'Value'")

print(c)

I looked up this question, because I wanted to know how to retrieve the name of "the key" if my dictionary only had one entry. In my case, the key was unknown to me and could be any number of things. Here is what I came up with:

dict1 = {'random_word': [1,2,3]}

key_name = str([key for key in dict1]).strip("''")        

print(key_name)  # equal to 'random_word', type: string.