Trying to use python map to add input values to a dictionary-CodePudding

I am using map to pass input parameters from STDIN to my function, dict_add,but when I print out my dictionary, it is empty.

Can someone please tell me where I am going wrong?

Not doing this for any reason, just practicing python code.

store = {}

def dict_add(n):
   store[n] = store.get(n,0)   1


results = map(dict_add,input("Number: ").split())



print(store) # comes out empty

CodePudding user response：

map is an iterator, so dict_add doesn't actually get called until you iterate it in some way. Example:

list(map(dict_add,input("Number: ").split()))

for _ in map(dict_add,input("Number: ").split()):
    pass

I'm not saying this is the best way to achieve what you're trying to do, but it's why you're seeing this behaviour.

CodePudding user response：

I'm not sure why you use map, you can just pass in the value.

also .split() return an array and I think you want to pass the input as a value

also result variable is never used

store = {}


def dict_add(n):
    global store
    store[n] = store.get(n, 0)   1


dict_add(input("Number: "))
print(store)  # {'1': 1}

you can do something like this in a loop, so it return a larger dict

store = {}


def dict_add(n):
    global store
    store[n] = store.get(n, 0)   1


for count in range(5):
    dict_add(input("Number: "))

print(store)  # {'1': 2, '2': 1, '3': 1, '4': 1}