Write a function that reads the words in 'food_codes.txt' and stores them as keys in a dictionary.  The words are separated by a tab ('t').

Then you can use the 'in' operator to see if '701311' is in the dictionary.

 foods_codes.txt:

item_code item_name
701111 Flour, white, all-purpose, per lb. (453.6 gm)
701311 Rice, white, long grain, pre-cooked (cost per pound/453.6 grams)
701312 Rice, white, long grain, uncooked, per lb. (453.6 gm)
701321 Spaghetti (cost per pound/453.6 grams)
701322 Spaghetti and macaroni, per lb. (453.6 gm)
702111 Bread, white, pan, per lb. (453.6 gm)
702112 Bread, French, per lb. (453.6 gm)
702211 Bread, rye, pan (cost per pound/453.6 grams)
702212 Bread, whole wheat, pan, per lb. (453.6 gm)
702213 Bread, wheat blend, pan (cost per pound/453.6 grams)
702221 Rolls, hamburger (cost per pound/453.6 grams)
702411 Cupcakes, chocolate (cost per pound/453.6 grams)
702421 Cookies, chocolate chip, per lb. (453.6 gm)
702611 Crackers, soda, salted, per lb. (453.6 gm)
703111 Ground chuck, 100% beef, per lb. (453.6 gm)
703112 Ground beef, 100% beef, per lb. (453.6 gm)
703113 Ground beef, lean and extra lean, per lb. (453.6 gm)
703211 Chuck roast, USDA Choice, bone-in, per lb. (453.6 gm)
703212 Chuck roast, graded and ungraded, excluding USDA Prime and Choice, per lb. (453.6 gm)
703213 Chuck roast, USDA Choice, boneless, per lb. (453.6 gm)
703311 Round roast, USDA Choice, boneless, per lb. (453.6 gm)
703312 Round roast, graded and ungraded, excluding USDA Prime and Choice, per lb. (453.6 gm)
703411 Rib roast, USDA Choice, bone-in, per lb. (453.6 gm)
703421 Steak, chuck, U.S. choice, bone-in (cost per pound/453.6 grams)
703422 Steak, T-Bone, USDA Choice, bone-in, per lb. (453.6 gm)
703423 Steak, porterhouse, U.S. choice, bone-in (cost per pound/453.6 grams)
703425 Steak, rib eye, USDA Choice, boneless, per lb. (453.6 gm)
703431 Short ribs, any primal source, bone-in, per lb. (453.6 gm)
703432 Beef for stew, boneless, per lb. (453.6 gm)
703511 Steak, round, USDA Choice, boneless, per lb. (453.6 gm)
703512 Steak, round, graded and ungraded, excluding USDA Prime and Choice, per lb. (453.6 gm)
703611 Steak, sirloin, USDA Choice, bone-in, per lb. (453.6 gm)
703612 Steak, sirloin, graded and ungraded, excluding USDA Prime and Choice, per lb. (453.6 gm)
703613 Steak, sirloin, USDA Choice, boneless, per lb. (453.6 gm)
704111 Bacon, sliced, per lb. (453.6 gm)
704211 Chops, center cut, bone-in, per lb. (453.6 gm)
704212 Chops, boneless, per lb. (453.6 gm)
704311 Ham, rump or shank half, bone-in, smoked,per lb. (453.6 gm)
704312 Ham, boneless, excluding canned, per lb. (453.6 gm)
704313 Ham, rump portion, bone-in, smoked (cost per pound/453.6 grams)
704314 Ham, shank portion, bone-in, smoked (cost per pound/453.6 grams)
704321 Ham, canned, 3 or 5 lbs, per lb. (453.6 gm)
704411 Pork shoulder roast, blade boston, bone-in (cost per pound/453.6 grams)
704412 Pork sirloin roast, bone-in (cost per pound/453.6 grams)
704413 Shoulder picnic, bone-in, smoked, per lb. (453.6 gm)
704421 Sausage, fresh, loose, per lb. (453.6 gm)
705111 Frankfurters, all meat or all beef, per lb. (453.6 gm)
705121 Bologna, all beef or mixed, per lb. (453.6 gm)
705141 Beef liver (cost per pound/453.6 grams)
705142 Lamb and mutton, bone-in, per lb. (453.6 gm)
706111 Chicken, fresh, whole, per lb. (453.6 gm)
706211 Chicken breast, bone-in, per lb. (453.6 gm)
706212 Chicken legs, bone-in, per lb. (453.6 gm)
706311 Turkey, frozen, whole, per lb. (453.6 gm)
707111 Tuna, light, chunk, per lb. (453.6 gm)
708111 Eggs, grade A, large, per doz.
708112 Eggs, grade AA, large, per doz.
709111 Milk, fresh, whole, fortified, per 1/2 gal. (1.9 lit)
709112 Milk, fresh, whole, fortified, per gal. (3.8 lit)
709211 Milk, fresh, skim (cost per one-half gallon/1.9 liters)
709212 Milk, fresh, low fat, per 1/2 gal. (1.9 lit)
709213 Milk, fresh, low fat, per gal. (3.8 lit)
710111 Butter, salted, grade AA, stick, per lb. (453.6 gm)
710122 Yogurt, natural, fruit flavored, per 8 oz. (226.8 gm)
710211 American processed cheese, per lb. (453.6 gm)
710212 Cheddar cheese, natural, per lb. (453.6 gm)
710411 Ice cream, prepackaged, bulk, regular, per 1/2 gal. (1.9 lit)
711111 Apples, Red Delicious, per lb. (453.6 gm)
711211 Bananas, per lb. (453.6 gm)
711311 Oranges, Navel, per lb. (453.6 gm)
711312 Oranges, Valencia, per lb. (453.6 gm)
711411 Grapefruit, per lb. (453.6 gm)
711412 Lemons, per lb. (453.6 gm)
711413 Pears, Anjou, per lb. (453.6 gm)
711414 Peaches, per lb. (453.6 gm)
711415 Strawberries, dry pint, per 12 oz. (340.2 gm)
711416 Grapes, Emperor or Tokay (cost per pound/453.6 grams)
711417 Grapes, Thompson Seedless, per lb. (453.6 gm)
711418 Cherries, per lb. (453.6 gm)
712111 Potatoes, white (cost per pound/453.6 grams)
712112 Potatoes, white, per lb. (453.6 gm)
712211 Lettuce, iceberg, per lb. (453.6 gm)
712311 Tomatoes, field grown, per lb. (453.6 gm)
712401 Cabbage, per lb. (453.6 gm)
712402 Celery, per lb. (453.6 gm)
712403 Carrots, short trimmed and topped, per lb. (453.6 gm)
712404 Onions, dry yellow, per lb. (453.6 gm)
712405 Onions, green scallions (cost per pound/453.6 grams)
712406 Peppers, sweet, per lb. (453.6 gm)
712407 Corn on the cob, per lb. (453.6 gm)
712408 Radishes (cost per pound/453.6 grams)
712409 Cucumbers, per lb. (453.6 gm)
712410 Beans, green, snap (cost per pound/453.6 grams)
712411 Mushrooms (cost per pound/453.6 grams)
712412 Broccoli, per lb. (453.6 gm)
713111 Orange juice, frozen concentrate, 12 oz. can, per 16 oz. (473.2 ml)
713311 Apple Sauce, any variety, all sizes, per lb. (453.6 gm)
713312 Peaches, any variety, all sizes, per lb. (453.6 gm)
714111 Potatoes, frozen, French fried, per lb. (453.6 gm)
714221 Corn, canned, any style, all sizes, per lb. (453.6 gm)
714231 Tomatoes, canned, whole, per lb. (453.6 gm)
714232 Tomatoes, canned, any type, all sizes,  per lb. (453.6 gm)
714233 Beans, dried, any type, all sizes, per lb. (453.6 gm)
715111 Hard candy, solid (cost per pound/453.6 grams)
715211 Sugar, white, all sizes, per lb. (453.6 gm)
715212 Sugar, white, 33-80 oz. pkg, per lb. (453.6 gm)
715311 Jelly (cost per pound/453.6 grams)
716111 Margarine, vegetable oil blends, stick (cost per pound/453.6 grams)
716113 Margarine, vegetable oil blends, soft, tubs (cost per pound/453.6 grams)
716114 Margarine, stick, per lb. (453.6 gm)
716116 Margarine, soft, tubs, per lb. (453.6 gm)
716121 Shortening, vegetable oil blends, per lb. (453.6 gm)
716141 Peanut butter, creamy, all sizes, per lb. (453.6 gm)
717111 Cola, non-diet, return bottles, 6 or 8 pack (cost per 16 ounces/473.2 ml)
717112 Cola, non diet, return bottles, 24-40 ounce (cost per 16 ounces/473.2 ml)
717113 Cola, nondiet, cans, 72 oz. 6 pk., per 16 oz. (473.2 ml)
717114 Cola, nondiet, per 2 liters (67.6 oz)
717311 Coffee, 100%, ground roast, all sizes, per lb. (453.6 gm)
717312 Coffee, 100%, ground roast, 13.1-20 oz. can, per lb. (453.6 gm)
717324 Coffee, instant, plain, regular, 6.1-14 ounce (cost per 16 ounces/453.6 grams)
717325 Coffee, freeze dried, regular, all sizes (cost per 16 ounces/453.6 grams)
717326 Coffee, freeze dried, decaf., all sizes (cost per 16 ounces/453.6 grams)
717327 Coffee, instant, plain, regular, all sizes, per lb. (453.6 gm)
717411 Coffee, instant, plain, 9.1-14 ounce (cost per 16 ounces/453.6 grams)
717412 Coffee, instant, plain, 3.1-6 ounce (cost per 16 ounces/453.6 grams)
717413 Coffee, freeze dried, plain, 3.1-9 ounce (cost per 16 ounces/453.6 grams)
718311 Potato chips, per 16 oz.
718631 Pork and beans, canned (cost per 16 ounces/453.6 grams)
720111 Malt beverages, all types, all sizes, any origin, per 16 oz. (473.2 ml)
720211 Bourbon whiskey, 375 ml-1.75 liter (cost per 25.4 ounces/750 ml)
720221 Vodka, domestic, 375 ml-1.75 liter (cost per 25.4 ounces/750 ml)
720222 Vodka, all types, all sizes, any origin, per 1 liter (33.8 oz)
720311 Wine, red and white table, all sizes, any origin, per 1 liter (33.8 oz)
72511 Fuel oil #2 per gallon (3.785 liters)
72601 Utility (piped) gas - 40 therms
72610 Electricity per KWH
72611 Utility (piped) gas - 100 therms
72620 Utility (piped) gas per therm
72621 Electricity per 500 KWH
74712 Gasoline, leaded regular (cost per gallon/3.8 liters)
74713 Gasoline, leaded premium (cost per gallon/3.8 liters)
74714 Gasoline, unleaded regular, per gallon/3.785 liters
74715 Gasoline, unleaded midgrade, per gallon/3.785 liters
74716 Gasoline, unleaded premium, per gallon/3.785 liters
74717 Automotive diesel fuel, per gallon/3.785 liters
7471A Gasoline, all types, per gallon/3.785 liters
FC1101 All uncooked ground beef, per lb. (453.6 gm)
FC2101 All Uncooked Beef Roasts, per lb. (453.6 gm)
FC3101 All Uncooked Beef Steaks, per lb. (453.6 gm)
FC4101 All Uncooked Other Beef (Excluding Veal), per lb. (453.6 gm)
FD2101 All Ham (Excluding Canned Ham and Luncheon Slices), per lb. (453.6 gm)
FD3101 All Pork Chops, per lb. (453.6 gm)
FD4101 All Other Pork (Excluding Canned Ham and Luncheon Slices), per lb. (453.6 gm)
FF1101 Chicken breast, boneless, per lb. (453.6 gm)
FJ1101 Milk, fresh, low-fat, reduced fat, skim, per gal. (3.8 lit)
FJ4101 Yogurt, per 8 oz. (226.8 gm)
FL2101 Lettuce, romaine, per lb. (453.6 gm)
FN1101 All soft drinks, per 2 liters (67.6 oz)
FN1102 All soft drinks, 12 pk, 12 oz., cans, per 12 oz. (354.9 ml)
FS1101 Butter, stick, per lb. (453.6 gm)