Appending values in a list in a dictionary in python

Question

I am trying to add values to a list inside a dictionary. I have had a look at this and tried append, but I get an error.

Code:

def name_counts(x):
    firsts = {}
    for full in x:
        part = full.split()
        fn = part[0]
        if fn in firsts:
            firsts[fn].append(full)
        else:
            firsts[fn] = []
            firsts[fn] = full
    return(firsts)


name_list = ["David Joyner", "David Zuber", "Brenton Joyner",
             "Brenton Zuber", "Nicol Barthel", "Shelba Barthel",
             "Shelba Crowley", "Shelba Fernald", "Shelba Odle",
             "Shelba Fry", "Maren Fry"]
print(name_counts(name_list))

Error:

AttributeError: 'str' object has no attribute 'append'

Desired output:

{'Shelba': ['Shelba Barthel', 'Shelba Crowley', 'Shelba Fernald', 'Shelba Odle', 'Shelba Fry'],'David': ['David Joyner', 'David Zuber'], 'Brenton': ['Brenton Joyner', 'Brenton Zuber'], 'Maren': ['Maren Fry'], 'Nicol': ['Nicol Barthel']}

@ArkistarvhKltzuonstev what do you mean "try"? That line is the problem. — jonrsharpe
– jonrsharpe, Commented Jun 25, 2019 at 12:14

NotNik. · Accepted Answer · 2019-06-25 12:17:37Z

2

When you create the list you are immediately replacing it with a string. Try:

if fn in firsts:
    firsts[fn].append(full)
else:
    firsts[fn] = [full]

instead of

if fn in firsts:
    firsts[fn].append(full)
else:
    firsts[fn] = []
    firsts[fn] = full

answered Jun 25, 2019 at 12:17

NotNik.

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Ashutosh gupta · Accepted Answer · 2019-06-25 13:15:14Z

2

def name_counts(x):
firsts = {}
for full in x:
    part = full.split()
    fn = part[0]
    if fn not in firsts:
        firsts[fn] = []

    firsts[fn].append(full)
return(firsts)


name_list = ["David Joyner", "David Zuber", "Brenton Joyner",
         "Brenton Zuber", "Nicol Barthel", "Shelba Barthel",
         "Shelba Crowley", "Shelba Fernald", "Shelba Odle",
         "Shelba Fry", "Maren Fry"]
print(name_counts(name_list))

edited Jun 25, 2019 at 13:15

answered Jun 25, 2019 at 12:15

Ashutosh gupta

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