Read data from a CSV file in S3 bucket and store it in a dictionary in python

[snippsat]

is there other ways for me to achieve the same without CSV module?

Yes you can write a own csv.DictReader implementation.
Also if you look at csv module at top there is a link to Source code: Lib/csv.py .
So there can look at how they have written it,the important part start at line 119.

Here is start with some good hints,as this is homework there missing a little part.

lst = []
with open("log.csv") as f:
    header = next(f)
    header = header.strip().split(',')
    for row in f:
        row = row.strip().split(',')
        print(row)

Look at what have now.

['xxx', 'uk', 'france']
['yyyy', 'norway', 'finland']
['zzzz', 'denmark', 'canada']

>>> header
['name', 'origin', 'dest']

>>> row
['zzzz', 'denmark', 'canada']

# Now can test line 119
>>> dict(zip(header, row))
{'name': 'zzzz', 'origin': 'denmark', 'dest': 'canada'}