CODEWITHSUNDEEP
pythonpython-3.x
William III
William III

Reputation: 145

Unexpected Result with MAP

I was expecting the code under header 'New List with MAP' below to return a list just like the for loop and the list comprehension....but alas, it does not. I get, <map object at 0X000...8C1CD30> instead. How do i go from this to my list?

New List with Map

list_a = ['one_A', 'two_A', 'three_A']

#initialize the list
new_li = map(lambda i: '{0}\n'.format(i), list_a)

print(new_li)

New List With Loop (Works)

list_a = ['one_A', 'two_A', 'three_A']
new_li = []
for i in list_a:
    new_li.append('{i}\n'.format(i))

print(new_li)

New List with List Comprehension (Works)

list_a = ['one_A', 'two_A', 'three_A']

new_li = ['{i}\n'.format(i=i) for i in list_a]

print(new_li)

Upvotes: 3

Views: 48

Answers (1)

Daniel
Daniel

Reputation: 42778

map returns an iterator. If you want the values in a list, you have to convert it to a list:

new_li = list(map(lambda i: '{0}\n'.format(i), list_a))

or

new_li = list(map('{0}\n'.format, list_a))

Upvotes: 3

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