使用“for”循环打印字典

Question

states = { 'Orengon': 'OR' 'Florida': 'FL' 'California': 'CA' 'New York': 'NY' 'Michigan': 'MI' }

for state, abbrev in list(states.items()):

   print(f"{state} is abbreviated {abbrev}")

Here in "for" loop why are we using "list" keyword?

and what is .items keyword for(states.items)?

Answer 1

list(states.items())

It will convert it into list. However, it is not needed as states.items() returns list on tuples.

Dictionary

states = { 'Orengon': 'OR', 'Florida': 'FL', 'California': 'CA', 'New York': 'NY', 'Michigan': 'MI', }

After performing states.items()

[('Orengon', 'OR'), ('Michigan', 'MI'), ('New York', 'NY'), ('Florida', 'FL'), ('California', 'CA')]

After performing list(states.items())

[('Orengon', 'OR'), ('Michigan', 'MI'), ('New York', 'NY'), ('Florida', 'FL'), ('California', 'CA')]