Adding a constant integer to a value in a python dictionary

Question

How would you add a constant number, say 1, to a value in a dictionary if certain conditions are fulfilled.

For example, if I had a dictionary:

dict          


        

Answer 1

Another way of doing this would be to use the items() method of dictionary which returns a list of key, value tuples:

def f(dict):
    for entry in dict.items():
        if entry[1] > 1 and entry[1] < 5:
            dict[entry[0]] = entry[1] + 1
    return dict

You can then extend this to take an arbitrary function:

def f(dict, func):
    for entry in dict.items():
        if func(entry[1]):
            dict[entry[0]] = entry[1] + 1
    return dict

This can be provided a function such as:

def is_greater_than_one(x):
    return x > 1

and called in the following way:

f(input_dictionary,is_greater_than_one)