Subtract integer-variable with dictionary or list in Python-CodePudding

Hello! I am trying to subtract an integer-variable with all values in my dictionary. I've even tried converting the dict to a list. Nothing seems to work for me.

I tried doing this just so see if it works, and it does work for one item in my expenses-dictionary, but how do I get all values from the dictionary and subtract it with my budget?

budget = budget - expenses["Rent"]

The error I'm getting: TypeError: unsupported operand type(s) for -: 'int' and 'str'

CodePudding user response：

So you have a dict called expenses. Unfortunately, its entries are strings.

The easiest thing to do is

budget -= sum(float(v) for k, v in expenses.items())

where we iterate over all entries of expenses, turn their values into a float (which bears problems on its own when using it with monetary values, but I do so for simplicity), sum them together and subtract this sum from the budget.

CodePudding user response：

budget = ...
expenses = {...}

for expense in expenses:
    budget -= float(expenses[expense])