New submission from Reuben Thomas : The CTypes documentation has this example:

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s = c_char_p() s.value = "abc def ghi" s.value 'abc def ghi' s.value is s.value False

It appears not to have been updated since Python 2: in Python 3, you can't assign a str to a c_char_p. If one tries the example code above, one gets:

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s = c_char_p() s.value = "abc def ghi" Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: bytes or integer address expected instead of str instance

Using a bytes works:

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s = c_char_p() s.value = b"abc def ghi" s.value b'abc def ghi' s.value is s.value False

Hence adding the two "b"s is an obvious fix. Note that the similar example with c_wchar_p does work fine with str. ---------- assignee: docs@python components: Documentation messages: 347725 nosy: docs@python, rrt priority: normal severity: normal status: open title: Incorrect use of c_char_p in example code versions: Python 3.9 _______________________________________ Python tracker https://bugs.python.org/issue37571 _______________________________________