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+--- Thread: Line of code to show dictionary doesn't work (/thread-28646.html)
Line of code to show dictionary doesn't work - MaartenRo - Jul-28-2020
Hi,
I am trying to write a line of code that should return the names and their favourite colors. Somehow it won't work. What am i doing wrong? I don't get an error messgae just nothing happens when i press enter after the code.
Thanks in advance!
>>> Colors = {"Sam": "Blauw", "Ali": "Rood", "Saar": "Geel"}
>>> Colors
{'Sam': 'Blauw', 'Ali': 'Rood', 'Saar': 'Geel'}
>>> Colors.keys()
dict_keys(['Sam', 'Ali', 'Saar'])
>>> for Item in Colors.keys():
print("{0} houdt van de kleur {1}."
.format(Item, Colors{Item}))
SyntaxError: invalid syntax
>>> for Item in Colors.keys():
print("{0} houdt van de kleur {1}."
.format(Item, Colors[Item]))
RE: Line of code to show dictionary doesn't work - ndc85430 - Jul-28-2020
Did you forget to indent the
print inside the for? Also, a few things: 1. Dictionaries are iterable and iterating over them gives you the keys, so calling
keys explicitly is unnecessary.2. If you want both the key and the value, you can use
items:>>> d = {"foo": 1, "bar": 2}
>>> for key, value in d.items():
... print(key, value)
...
foo 1
bar 2
RE: Line of code to show dictionary doesn't work - deanhystad - Jul-28-2020
Use Colors['Sam'] to get Sam's favorite color. You can also use Colors.get('Sam'). get is useful when looking up keys that may not be in the dictionary. Colors['Bob'] will throw an exception, but Colors.get('Bob', 'Green') will return 'Green', a default value used when the key is not found.
This code can use [] because the keys are guaranteed to be in the dictionary.
Colors = {'Sam': 'Blauw', 'Ali': 'Rood', 'Saar': 'Geel'}
for Item in Colors:
# print("{0} houdt van de kleur {1}.".format(Item, Colors[Item])) # Works
print(f'{Item} houdt van de kleur {Colors[Item]}.')) # Works, shorter, reads better