python add elements in a tuple

Question

i have done the following code in order to fill a tuple with user input and then add the elements of the tuple.For example giving as input 1,2 and 3,4 i have the tuple : ((1,2),(3,4)).Then i want to add 1+2 and 3+4.

This is the first part which works ok:

data=[]
mytuple=()

while True:
    myinput=raw_input("Enter two integers: ")
    if not myinput:
        print("Finished")
        break
    else: 
        myinput.split(",")
        data.append(myinput)
        mytuple=tuple(data)
print(data)
print(mytuple)

Then , try sth like:

for adding in mytuple:
    print("{0:4d} {1:4d}".format(adding)) # i am not adding here,i just print

I have two problems: 1) I don't know how to add the elements. 2) When i add the second part of the code(the adding) ,when i press enter instead of causing the break of the program it continues to ask me "Enter two integers"

Thank you!

you want to add the numbers.. but what do you want to do with the results? — Karoly Horvath
– Karoly Horvath, Commented Sep 11, 2011 at 15:42

Karoly Horvath · Accepted Answer · 2011-09-11 15:46:25Z

1

You need:

myinput = myinput.split(",")

and

data.append( (int(myinput[0]), int(myinput[1])) )

and

for adding in mytuple:
    print("{0:4d}".format(adding[0] + adding[1]))

edited Sep 11, 2011 at 15:46

answered Sep 11, 2011 at 15:37

Karoly Horvath

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Comments

unutbu · Accepted Answer · 2011-09-11 16:10:07Z

1

Using the built-in map function:

data=[]
mytuple=()

while True:
    myinput=raw_input("Enter two integers: ")
    if not myinput:
        print("Finished")
        break
    else: 
        myinput=map(int,myinput.split(","))                  # (1)
        data.append(myinput)
        mytuple=tuple(data)

print(data)
# [[1, 2], [3, 4]]
print(mytuple)
# ([1, 2], [3, 4])
print(' '.join('{0:4d}'.format(sum(t)) for t in mytuple))    # (2)
#    3    7

Use map(int,...) to convert the strings to integers. Also note there is an error here in the orginal code. myinput.split(",") is an expression, not an assignment. To change the value of myinput you'd have to say myinput = myinput.split(...).
Use map(sum,...) to apply sum to each tuple in mytuple.

edited Sep 11, 2011 at 16:10

answered Sep 11, 2011 at 15:39

unutbu

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6 Comments

George Over a year ago

:Thanks a lot for the answer but i don't know yet the map function.Is there another way?Also, i want to use the "format" function.

unutbu Over a year ago

@George: You could also use a list comprehension: [sum(t) for t in mytuple]

Karoly Horvath Over a year ago

your printing assumes that there were two entries (pairs).

George Over a year ago

I want to input pairs.Not only 2 entries,but in order to understand how it works iuse 2.Also,i don't know yet list comprehension:)

Karoly Horvath Over a year ago

@George: see my answer for beginner-level solution but both list comprehensions and map + filter are great tools and can create a lot more terse code. learn them ;)

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