python dictionary : values and keys

Question

so i have python homework and had to print values and keys, but with "->" between them.

d = {'x': 10, 'y': 20, 'z': 30}

this is values and keys and had to print it like this

x -> 10 y -> 20 z -> 30

i tried to do it like this

for key, value in d.items(): print(key + "->" + value)

but it tells me that "an only concatenate list (not "str") to list" what can i do?

Mehrdad Pedramfar · Accepted Answer · 2020-12-06 12:09:54Z

2

Try this: replace + with ,

print(key, "->", value)

answered Dec 6, 2020 at 12:09

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Comments

Mihai Alexandru-Ionut · Accepted Answer · 2020-12-06 12:19:55Z

You could use str constructor.

for key, value in d.items(): print(key + "->" + str(value)) ^^^^^^^^

Another approach could be using string interpolation.

for key, value in d.items(): print(f'{key} -> {value}')

Ahmet · Accepted Answer · 2020-12-06 12:54:49Z

Another option is using format

for key, value in d.items(): print("{}->{}".format(key, value))

You can also solve this problem in one line:

print('\n'.join(["{}->{}".format(key, value) for key, value in d.items()]))

Result:

x->10 y->20 z->30

Liss_88 · Accepted Answer · 2020-12-06 13:14:41Z

Use the "items" method in the dictionary class:

for i,v in d.items(): print(i, '->', v)

Make sure you're using a comma (,) and not a plus sign (+) between the variables of your one row.