Data Collection and Processing with Python - Week 2 - 23.2. Map

23_2_Map.py

# 1) Using map, create a list assigned to the variable greeting_doubled that doubles each element in the 
# list lst.

lst = [["hi", "bye"], "hello", "goodbye", [9, 2], 4]

greeting_doubled = map((lambda a_list: a_list * 2), lst)
print(greeting_doubled)

# Output:
# [['hi', 'bye', 'hi', 'bye'], 'hellohello', 'goodbyegoodbye', [9, 2, 9, 2], 8]



# 2. Below, we have provided a list of strings called abbrevs. Use map to produce a new list called 
# abbrevs_upper that contains all the same strings in upper case.

abbrevs = ["usa", "esp", "chn", "jpn", "mex", "can", "rus", "rsa", "jam"]
abbrevs_upper = map(lambda string: string.upper(), abbrevs)
print(abbrevs_upper)

# Output:
# ['USA', 'ESP', 'CHN', 'JPN', 'MEX', 'CAN', 'RUS', 'RSA', 'JAM']

Unfortunately, this code is not working to 100% and is showing only 80% of the result.
Why?

@miriamputter you need to cast to list because it returns an iterable.

@miriamputter you need to cast to list because it returns an iterable.

How do I do that? Can you write the complete code?

For the first one:

greeting_doubled=list(map((lambda value: 2*value), lst))
print(greeting_doubled)

For the second one:
abbrevs_upper=list(map(lambda x: x.upper(), abbrevs))
print(abbrevs_upper)

For the first one:

greeting_doubled=list(map((lambda value: 2*value), lst)) print(greeting_doubled)

For the second one: abbrevs_upper=list(map(lambda x: x.upper(), abbrevs)) print(abbrevs_upper)

Thank you!

lst = [["hi", "bye"], "hello", "goodbye", [9, 2], 4]
greeting_doubled = list(map((lambda value: 2*value), lst))
print(greeting_doubled)

you can use this instead

and for the second one

abbrevs_upper = list(map((lambda str: str.upper()), abbrevs))
print(abbrevs_upper)

Thanks! I forgot in the latest version of python you have to cast to list in these cases...