Python Forum

is list() new in python3? I ask because my lambda functions will provide my lambda object name without list() only. But won't print without list(). Many lambda examples on the net work without list() [http://www.secnetix.de/olli/Python/lambd...tions.hawk]

Output:
>>> sentence ='it is raining'
>>> words = sentence.split()
>>> print(words)
['it', 'is', 'raining']
>>> lengths = map(lambda word: len(word),words)
>>> print(lengths)
<map object at 0x7f82ad3a0b70>
>>> print(list(lengths))
[2, 2, 7]
>>> 

in python 3 map would produce/return iterator. that's why you need to use list to convert to list object.
without it you still can iterate over elements e.g.

for word_length in lengths:
    print(word_length)

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Also, note that you don't need lambda in this case

>>> words = ['it', 'is', 'raining']
>>> list(map(len, words))
[2, 2, 7]