如何将值添加到现有字典键 Python
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How to add values to existing dictionary key Python
提问by OmicronAlpha
I am trying to create a function that takes in four parameters: A keyname, start time, end time, and then a dictionary. I have to create a tuple out of the start time and end time and then append that to a list of tuples, as we will be running this function multiple times. Then I am trying to put certain parts of the list of tuples to certain keynames.
我正在尝试创建一个接受四个参数的函数：键名、开始时间、结束时间和字典。我必须根据开始时间和结束时间创建一个元组，然后将其附加到元组列表中，因为我们将多次运行此函数。然后我试图将元组列表的某些部分放入某些键名。
I think it's better if I would show you would the output looks like:
我认为最好向您展示输出如下所示：
courses = insertIntoDataStruct(“CS 2316”, “1505”, “1555”, courses)
courses = insertIntoDataStruct(“CS 2316”, “1405”, “1455”, courses)
courses = insertIntoDataStruct(“CS 2316”, “1305”, “1355”, courses)
courses = insertIntoDataStruct(“CS 4400”, “1405”, “1455”, courses)
courses = insertIntoDataStruct(“CS 4400”, “1605”, “1655”, courses)
print(courses)
{'CS 2316': [(1505, 1555), (1405, 1455), (1305, 1355)], 'CS 4400': [(1405,
1455), (1605, 1655)]}
This is my code so far:
到目前为止，这是我的代码：
aDict = {}
tupleList = []
def insertIntoDataStruct(name,startTime,endTime,aDict):
timeTuple = tuple([startTime, endTime])
tupleList.append(timeTuple)
aDict[name] = tupleList
return aDict
I know that this will give me a dictionary with each key having ALL values, but I have no idea on how to make it so that each value that I add will be added on to the dictionary as seen in the output. I have tried a lot of random things, but I am still stuck on this. :(
我知道这会给我一个字典，每个键都有所有值，但我不知道如何制作它，以便我添加的每个值都将添加到字典中，如输出所示。我已经尝试了很多随机的事情，但我仍然坚持这一点。:(
采纳答案by Pooya Eghbali
Try this:
尝试这个：
def insertIntoDataStruct(name,startTime,endTime,aDict):
if not name in aDict:
aDict[name] = [(startTime,endTime)]
else:
aDict[name].append((startTime,endTime))
Now define your dict:
现在定义你的字典：
courses = {}
and start adding the courses:
并开始添加课程：
insertIntoDataStruct("CS 2316", "1505", "1555", courses)
insertIntoDataStruct("CS 2316", "1405", "1455", courses)
insertIntoDataStruct("CS 2316", "1305", "1355", courses)
insertIntoDataStruct("CS 4400", "1405", "1455", courses)
insertIntoDataStruct("CS 4400", "1605", "1655", courses)
回答by Graeme Stuart
You might want to use a defaultdict instead.
您可能想改用 defaultdict。
from collections import defaultdict
def insertIntoDataStruct(name,startTime,endTime,aDict):
aDict[name].append((int(startTime), int(endTime)))
return aDict
courses = defaultdict(list)
courses = insertIntoDataStruct("CS 2316", "1505", "1555", courses)
courses = insertIntoDataStruct("CS 2316", "1405", "1455", courses)
courses = insertIntoDataStruct("CS 2316", "1305", "1355", courses)
courses = insertIntoDataStruct("CS 4400", "1405", "1455", courses)
courses = insertIntoDataStruct("CS 4400", "1605", "1655", courses)
print courses == {'CS 2316': [(1505, 1555), (1405, 1455), (1305, 1355)], 'CS 4400': [(1405, 1455), (1605, 1655)]}
print courses
Perhaps you don't even need a function.
也许您甚至不需要函数。
from collections import defaultdict
courses = defaultdict(list)
courses["CS 2316"].append((int("1505"), int("1555")))
courses["CS 2316"].append((int("1405"), int("1455")))
courses["CS 2316"].append((int("1305"), int("1355")))
courses["CS 4400"].append((int("1405"), int("1455")))
courses["CS 4400"].append((int("1605"), int("1655")))
