How to Print the Key-Value Pairs of a Dictionary in Python

How do I print the key-value pairs of a dictionary in python

Python 2 and Python 3

i is the key, so you would just need to use it:

for i in d:
    print i, d[i]

Python 3

d.items() returns the iterator; to get a list, you need to pass the iterator to list() yourself.

for k, v in d.items():
    print(k, v)

Python 2

You can get an iterator that contains both keys and values. d.items() returns a list of (key, value) tuples, while d.iteritems() returns an iterator that provides the same:

for k, v in d.iteritems():
    print k, v

How to print Specific key value from a dictionary?

It's too late but none of the answer mentioned about dict.get() method

>>> print(fruit.get('kiwi'))
2.0

In dict.get() method you can also pass default value if key not exist in the dictionary it will return default value. If default value is not specified then it will return None.

>>> print(fruit.get('cherry', 99))
99

fruit dictionary doesn't have key named cherry so dict.get() method returns default value 99

How to print a dictionary's key?

A dictionary has, by definition, an arbitrary number of keys. There is no "the key". You have the keys() method, which gives you a python list of all the keys, and you have the iteritems() method, which returns key-value pairs, so

for key, value in mydic.iteritems() :
    print key, value

Python 3 version:

for key, value in mydic.items() :
    print (key, value)

So you have a handle on the keys, but they only really mean sense if coupled to a value. I hope I have understood your question.

Return first N key:value pairs from dict

There's no such thing a the "first n" keys because a dict doesn't remember which keys were inserted first.

You can get any n key-value pairs though:

n_items = take(n, d.items())

This uses the implementation of take from the itertools recipes:

from itertools import islice

def take(n, iterable):
    """Return the first n items of the iterable as a list."""
    return list(islice(iterable, n))

See it working online: ideone

For Python < 3.6

n_items = take(n, d.iteritems())

Print the dict with “key: value” pairs in a for loop

You should instead be using dict.items instead, since dict.keys only iterate through the keys, and then you're printing dict.values() which returns all the values of the dict.

spam = {'color': 'red', 'age': '42','planet of origin': 'mars'}

 for k,v in spam.items():
     print(str(k)+': '  + str(v))

Turning Key, Value pairs from a Dictionary into strings

Here you go. Simply iterate the key, value pairs and format your template.

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

for key, value in mydict.items():
    print('{} is in {}'.format(key, value))

Output:

a is in 1
b is in 2

If you would like to get a list of formated strings just do:

mylist = ['{} is in {}'.format(key, value) for key, value in mydict.items()]

mylist will be ['a is in 1', 'b is in 2'].

---

Related Topics