Convert forloop to list comprehension

Warning: a Python newbie here.

I am trying to convert the following to list comprehension but struggling:-

lorem_ipsum = """
Lorem ipsum dolor sit amet, consectetur adipiscing elit.
"""

def word_count2(str):
    counts = dict()
    words = str.split() 

    for word in words:
        if word in counts:
            counts[word] += 1
        else:
            counts[word] = 1

    return counts

print(word_count2(lorem_ipsum))

So far I have tried a few variations on this:-

aString = lorem_ipsum

counts = dict()
words = aString.split

[counts[word] += 1 if word in counts else counts[word] = 1 for word in words]

Unfortunately, it has been some hours now but nothing I have tried seems to work