Tuples in Dicts

Question

Is it possible in python to add a tuple as a value in a dictionary?
And if it is,how can we add a new value, then? And how can we remove and change it?

Answer 1

>>> a = {'tuple': (23, 32)}
>>> a
{'tuple': (23, 32)}
>>> a['tuple'] = (42, 24)
>>> a
{'tuple': (42, 24)}
>>> del a['tuple']
>>> a
{}

if you meant to use tuples as keys you could do:

>>> b = {(23, 32): 'tuple as key'}
>>> b
{(23, 32): 'tuple as key'}
>>> b[23, 32] = 42
>>> b
{(23, 32): 42}

Generally speaking there is nothing specific about tuples being in dictionary, they keep behaving as tuples.

Answer 2

You can't change a tuple itself. You have to replace it by a different tuple.

When you use a list, you could also add values to it (changing the list itself) without need to replace it:

>> a = {'list': (23, 32)}
>> a
{'list': [23, 32]}
>> a['list'].append(99)
>> a
{'list': [23, 32, 99]}

In most cases, lists can be used as replacement for tuples (since as much I know they support all tuple functions -- this is duck typing, man!)

Answer 3

Well,thanx for your answers...but i didnt really mean that! If we have a dictionary, a number as its key and a tuple as the value. The tuple is on this way:

t1=('name','date')

If i want to add for example a new name on the tuple...in order to put it on the dict... How can i make it?

d1={Number:'(name,date)'}

Thanxxx in advance

Answer 4

t1=('name','date')
t2=('x','y')

# "Number" is a String key!
d1={"Number":t1}
# Update the value of "Number"
d1["Number"] = t2

# Use a tuple as key, and another tuple as value
d1[t1] = t2

# Obtain values (getters)

# Can throw a KeyError if "Number" not a key
foo = d1["Number"]

# Does not throw a key error, t1 is the value if "Number" is not in the dict
d1.get("Number", t1)

# t3 now is the same as t1
t3 = d1[ ('name', 'date') ]

You updated your question again. Please take a look at Python dict docs. Python documentation is one of it's strong points! And play with the interpreter (python)on the command line! But let's continue.

1. initially key 0

   d[0] = ('name', datetime.now())

2. id known d[1] = d[0] del d[0]

3. name changed tmp = d[1] d[1] = ( newname, tmp[1] )

And please consider using a

class Person(object):
    personIdCounter = 1
    def __init__(self):
      self.id = Person.personIdCounter
      Person.personIdCounter += 1
      self.name
      self.date

then

persons = {}
person = Person()
persons[person.id] = person
person.name = "something"

persons[1].name = "something else"

That looks better than a tuple and models your data better.

Answer 5

The question is that: i want a dictionary with the basic infos of some people lets say. The dict contains numbers as keys and tuples as values.Tuples contain the name and the date for every person. I wann fix a menu choice in which: 1)i can add in the dict a new person(with initional date 0) 2)i can remove a person from the dict (using only his number) 3)i can add a new date(again using only his number) 4)and finally print the dict!

t1=('name','date')
d1={Number:'(name,date)'}

Answer 6

The question is that: i want a dictionary with the basic infos of some people lets say. The dict contains numbers as keys and tuples as values.Tuples contain the name and the date for every person. I wann fix a menu choice in which: 1)i can add in the dict a new person(with initional date 0) 2)i can remove a person from the dict (using only his number) 3)i can add a new date(again using only his number) 4)and finally print the dict!

t1=('name','date')
d1={Number:'(name,date)'}

Answer 7

I was thinking sth like that (the specific doesnt work :ppp):

names=[]                     
dates=[]                   
Number=[]                       

t1=tuple()
t1=(names) + (dates)       

d1=dict((Number)='t1')             


def new_person(name,date,Number1):

    names.append('name')
    print(names)
    grade.append('date')
    print(dates)
    t1=(names) + (dates)
    print(t1)