Returns two elements from a list whose sum is a target variable

Your search function is terribly unclear. search is a vague name, and a, b, d and m don't communicate anything. Looking at the usage I can see you're testing if a number is in the list, but Python can already do that for you much more readably.

if number in list

The in keyword tests if a value exists in a list, returning either True or False. So you can forget about search and just directly test for pair's existence in the main loop:

x = [1,4,5,7,9,6,2]
target = int(raw_input("Enter the number:"))
for i in x:
    if i < target:
        pair = int(target) - int(i)
        if pair in x:
            print "the first number= %d the second number %d"%(i,pair)
            break

Back to the naming, x is not clear, at least using numbers indicates what it contains. x implies a single value which makes using for i in x extra confusing. pair also sounds like it's multiple items, when really it's the difference you want.

You also don't need to call int on i when the list is populated with integers already.

Lastly, you're using the old form of string formatting. You should instead use str.format, like so:

print("the first number= {} the second number {}".format(i,pair))

It works very similarly, except that it's type agnostic. It will just do it's best to get a string representation of the two values and insert them. There's lots of other uses for this approach so it's good to get used to.

StackExchange Code Review Q#111912, answer score: 5