How to modify the program so that it does not repeat the pairs, without creating new array

Question

# Print all pairs of numbers in array A whose sum is greater than 10

A = [4,5,2,1,3,7]

for value_1 in A:
for value_2 in A:
total = value_1 + value_2
if (total > 10):
print (value_1, " + ", value_2, " > 10")

# OUTPUT
# 4 + 7 > 10
# 5 + 7 > 10
# 7 + 4 > 10 <-- Repeated
# 7 + 5 > 10 <-- Repeated
# 7 + 7 > 10 <-- same element

Answer 1

This is the best solution I could think of:

def pair(li,n):
pairs = []
for i in li:
for j in li:
c = sorted((i,j))
total = i + j
if total > n:
if c not in pairs:
pairs.append(c)
yield c

A = [4,5,2,1,3,7]

for (x,y) in pair(A,10):
print(x,y)

#output: 4 7
#output: 5 7
#output: 7 7

I hope it helps :)

Answer 2

@richard Great solution!

Answer 3

test = [4,5,2,1,3,7]
for ind,item in enumerate(test,1):
indx = ind
while indx < len(test):
if item + test[indx] > 10:
print(item,test[indx])
indx +=1

# or you may want to research itertools
# for more wide ranging applications of list pairings

import itertools
for i in itertools.combinations(test,2):
if sum(i)>10:
print(i)

Answer 4

Thank you very much Aidan, very good answer, but your code makes use of an array to save the pairs. I try to do it without that array.