[Python] Checking if first letter of string is in uppercase

I want to create a function that would check if first letter of string is in uppercase. This is what I've came up with so far:

def is_lowercase(word):
if word[0] in range string.ascii_lowercase:
return True
else:
return False


When I try to run it I get this error:

if word[0] in range string.ascii_lowercase
^
SyntaxError: invalid syntax


Can someone have a look and advise what I'm doing wrong?

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