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words = '''あいう'1２"３4５６'''

print("半角の文字は以下です")
for elem in words:
    if elem.encode('utf-8').isalnum():
        print(elem)

Success #stdin #stdout 0.04s 9372KB

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Standard input is empty

stdout

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半角の文字は以下です
1
4

https://ideone.com/zcY78d

Python3 > string > check half-width characters

language:

Python 3 (python 3.9.5)

created:

visibility:

public

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