{"id":17610,"date":"2022-10-26T06:15:34","date_gmt":"2022-10-26T00:45:34","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-implement-this-python-code-in-swift\/"},"modified":"2022-10-26T06:15:34","modified_gmt":"2022-10-26T00:45:34","slug":"solved-how-to-implement-this-python-code-in-swift","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-implement-this-python-code-in-swift\/","title":{"rendered":"[Solved] How to implement this Python code in Swift?"},"content":{"rendered":"

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First you should do is to properly define type of the graph<\/code>, because unlike Python<\/code> you have to specify types in Swift<\/code> in declaration:<\/p>\n

var graph: [String: [String: Int]] \/\/ Dictionary(hash table) with keys of type String and values of type Dictionary<String, Int>\n<\/code><\/pre>\n
Then you should initialize graph<\/code> with some initial value, because in Swift<\/code> you always explicitly initialize non-nullable variables:<\/p>\n
graph = [:] \/\/ empty dictionary, in Python it's {}\n<\/code><\/pre>\n
Declaration and initialization can be in one line, so you may just do this:<\/p>\n
var graph: [String: [String: Int]] = [:]\n<\/code><\/pre>\n
Then your code snippet, with little changes:<\/p>\n
graph[\"start\"] = [:]\ngraph[\"start\"]?[\"a\"] = 6 \/\/ ? can be replaced with ! here, because we know for sure \"start\" exists\ngraph[\"start\"]?[\"b\"] = 2 \/\/ but for simple tutorial purposes, I chose to use ? here\n<\/code><\/pre>\n
But it would be better if you would define \"start\"<\/code> value at once:<\/p>\n
graph[\"start\"] = [\n    \"a\": 6,\n    \"b\": 2\n]\n<\/code><\/pre>\n
\n
Or even do it for whole graph<\/code>:<\/p>\n
let graph: [String: [String: Int]] = [\n    \"start\": [\n        \"a\": 6,\n        \"b\": 2\n    ]\n] \n<\/code><\/pre>\n<\/p><\/div>\n
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            <\/span> <\/p><\/div>\n<\/div>\n
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solved How to implement this Python code in Swift? <\/p>\n","protected":false},"excerpt":{"rendered":"
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