Say I had a dictionary, containing float values and I wanted to add a specific float such as 0.1 to each value in the dictionary, how would I go about doing this
{1:0.1, 2:0.2, 3:0.3}
I would want the new dictionary to be
{1:0.2, 2:0.3, 3:0.4}
I know how to do this with a list but I have no clue how to do it with a dictionary
You can use a dict comprehension. Basically iterate over the items and add 0.1 to each value.
data = {1:0.1, 2:0.2, 3:0.3}
data = {key: value + 0.1 for key, value in data.items()}
The two current answers are fine, but both create a new dictionary.
Of course, you could always update your existing dictionary (e.g. named d):
for k in d:
d[k] += 0.1
Which (for clarity) is the same as (explicit .keys()):
for k in d.keys():
d[k] += 0.1
Note that this will not work or do what you expect:
for v in d.values():
v += 0.1
You can use a dictionary comprehension:
data = {1:0.1, 2:0.2, 3:0.3}
result = {k: v + 0.1 for k, v in data.items()}
print(result)
This prints:
{1: 0.2, 2: 0.30000000000000004, 3: 0.4}
which contains some (unavoidable) floating point rounding error.
