CODEWITHSUNDEEP
pythontuples
dvs
dvs

Reputation: 519

How to input a list of tuples

I am coding a python program related to graphs.
My main is like this

if __name__=='__main__': 
cns = [(0,1), (0,2),(1,2), (1,3),(3,1)]
G=make_graph(cns)
r=DFS(G)

I want to change the program such that the user can input the data.

cns = [(0,1), (0,2),(1,2), (1,3),(3,1)]

this list is to be read from the user. How to input a list of tuples, how to do that?

Can I use raw_input for this purpose?

Upvotes: 2

Views: 3325

Answers (3)

Sujatha
Sujatha

Reputation: 87

I would like to add to kindall's answer. When you run kindall's code, you are asked to enter the data. To enter a tuple, you can enter (1,2,3). Now to check if it's actually a tuple, you can add 2 lines: cns[0]=8 print cns

The output will give some error: "TypeError: 'tuple' object does not support item assignment".

Then, you know that cns is a tuple. Thanks @kindall!

Upvotes: 0

kindall
kindall

Reputation: 184201

from ast import literal_eval

cns = literal_eval(raw_input("Please enter the data: "))

Upvotes: 5

Joran Beasley
Joran Beasley

Reputation: 113988

points = map(lambda x:map(float,x.split(",")),
         iter(lambda:raw_input("Enter X,Y coordinates or Nothing to continue").strip(),""))
print points

Upvotes: 0

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