[Python] positional argument for a python function

def is_palindrome(teststr):
teststr = str(teststr)
for item in teststr:
if str.isalnum(item):
continue
else:
teststr.replace(item,'')
teststr = teststr.lower()

if teststr != teststr[::-1]:
return False
else:
return True


total = 0
test_words = ["Hello World!","Radar","Mama?","Madam, I'm Adam.",
"Race car!"]

for word in test_words:
if is_palindrome(word):
total = total + 1

print (str(total))



TypeError: is_palindrome() missing 1 required positional argument: 'teststr'

Not sure what it wants saw a similar question involving a dictionary but didn't see a solution

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