Accessing dictionary W/ Nested loops

dic = {"Vegetables":["Carrots","Broccoli","Mushrooms"], "fruits":["Apples ","Citrus"]}
for itm in dic: 
    for val in dic.values():
        print("{} are {}".format(dic[itm][val]))

How would I print ex.

Carrots are Vegetables
Apples are fruits

CodePudding user response：

Have a look at the items() method of dict. It will let you iterate over its keys and values.

So each key will be a string, and each value a list - you do not need to call any methods besides items() in your code, and you do not need to use [] anywhere.

for key, value in dic.items():
    for item in value:
        print(f'{item} are {key}')

A tip since you are clearly a Python beginner: Iterating over dict keys only (for key in somedict) is something you rarely do in Python - especially if the first thing inside that loop is something like value = somedict[key]; as you see in my example above, items() is much nicer since it will give you both at the same time.

CodePudding user response：

The first loop should iterate through the keys, while the second loop goes through the corresponding values. As it stands now, your loops are disconnected.

dic = {"Vegetables": ["Carrots", "Broccoli", "Mushrooms"], "fruits": ["Apples ", "Citrus"]}
for itm in dic:  # iterate through keys
    for val in dic[itm]:  # iterate through list corresponding to the key
        print("{} are {}".format(val, itm))  # print

Result:

Carrots are Vegetables
Broccoli are Vegetables
Mushrooms are Vegetables
Apples  are fruits
Citrus are fruits

CodePudding user response：

You might try:

for key, values in dic.items():
    for val in values:
        print('{val} are in {key}'.format(val=val, key=key))

CodePudding user response：

You can use dict.items().

dic = {"Vegetables":["Carrots","Broccoli","Mushrooms"], "fruits":["Apples ","Citrus"]}

for category, things in dic.items():
    for thing in things:
        print(f"{thing} are {category}")

Output:

Carrots are Vegetables
Broccoli are Vegetables
Mushrooms are Vegetables
Apples  are fruits
Citrus are fruits

CodePudding user response：

How about this?

dic = {"Vegetables":["Carrots","Broccoli","Mushrooms"], "fruits":["Apples ","Citrus"]}
for key, value in dic.items():
    print(f'key is {key}, value is {value}')

key is Vegetables, value is ['Carrots', 'Broccoli', 'Mushrooms']
key is fruits, value is ['Apples ', 'Citrus']