在 Linux 服务器上安装 Levenshtein 库时，遇到了 “PyString_Type” 未声明的错误，以及一系列关于指针转换的警告，该如何解决？

“纵有疾风来，人生不言弃”，这句话送给正在学习文章的朋友们，也希望在阅读本文《在 Linux 服务器上安装 Levenshtein 库时，遇到了 “PyString_Type” 未声明的错误，以及一系列关于指针转换的警告，该如何解决？》后，能够真的帮助到大家。我也会在后续的文章中，陆续更新文章相关的技术文章，有好的建议欢迎大家在评论留言，非常感谢！

当在 linux 服务器上安装 levenshtein 时，出现以下错误：

/yuwei/anaconda3/include/python3.7m/object.h:487:22: note: in definition of macro ‘PyObject_TypeCheck’
(Py_TYPE(ob) == (tp) || PyType_IsSubtype(Py_TYPE(ob), (tp)))
^
Levenshtein.c:666:33: note: each undeclared identifier is reported only once for each function it appears in
if (PyObject_TypeCheck(arg1, &PyString_Type)

^
/yuwei/anaconda3/include/python3.7m/object.h:487:22: note: in definition of macro ‘PyObject_TypeCheck’
(Py_TYPE(ob) == (tp) || PyType_IsSubtype(Py_TYPE(ob), (tp)))
^
Levenshtein.c:670:5: warning: implicit declaration of function ‘PyString_GET_SIZE’ [-Wimplicit-function-declaration]

len1 = PyString_GET_SIZE(arg1);

^
Levenshtein.c:673:5: warning: implicit declaration of function ‘PyString_AS_STRING’ [-Wimplicit-function-declaration]

string1 = PyString_AS_STRING(arg1);

^
Levenshtein.c:673:13: warning: assignment makes pointer from integer without a cast [enabled by default]

string1 = PyString_AS_STRING(arg1);

^
Levenshtein.c:674:13: warning: assignment makes pointer from integer without a cast [enabled by default]

string2 = PyString_AS_STRING(arg2);

^
Levenshtein.c:718:3: warning: implicit declaration of function ‘PyInt_FromLong’ [-Wimplicit-function-declaration]

return PyInt_FromLong((long)ldist);

^
Levenshtein.c:718:3: warning: return makes pointer from integer without a cast [enabled by default]

In file included from /yuwei/anaconda3/include/python3.7m/pytime.h:6:0,

from /yuwei/anaconda3/include/python3.7m/Python.h:87,

from Levenshtein.c:99:

Levenshtein.c: In function ‘hamming_py’:

Levenshtein.c:747:33: error: ‘PyString_Type’ undeclared (first use in this function)

if (PyObject_TypeCheck(arg1, &PyString_Type)

^
/yuwei/anaconda3/include/python3.7m/object.h:487:22: note: in definition of macro ‘PyObject_TypeCheck’

(Py_TYPE(ob) == (tp) || PyType_IsSubtype(Py_TYPE(ob), (tp)))

^
Levenshtein.c:758:13: warning: assignment makes pointer from integer without a cast [enabled by default]

string1 = PyString_AS_STRING(arg1);

^
Levenshtein.c:759:13: warning: assignment makes pointer from integer without a cast [enabled by default]

string2 = PyString_AS_STRING(arg2);

^
Levenshtein.c:761:5: warning: return makes pointer from integer without a cast [enabled by default]

return PyInt_FromLong(dist);

^
Levenshtein.c:777:5: warning: return makes pointer from integer without a cast [enabled by default]

return PyInt_FromLong(dist);

^
In file included from /yuwei/anaconda3/include/python3.7m/pytime.h:6:0,

from /yuwei/anaconda3/include/python3.7m/Python.h:87,

from Levenshtein.c:99:

Levenshtein.c: In function ‘jaro_py’:

Levenshtein.c:796:33: error: ‘PyString_Type’ undeclared (first use in this function)

if (PyObject_TypeCheck(arg1, &PyString_Type)

^
/yuwei/anaconda3/include/python3.7m/object.h:487:22: note: in definition of macro ‘PyObject_TypeCheck’

(Py_TYPE(ob) == (tp) || PyType_IsSubtype(Py_TYPE(ob), (tp)))

^
Levenshtein.c:802:13: warning: assignment makes pointer from integer without a cast [enabled by default]

string1 = PyString_AS_STRING(arg1);

^
Levenshtein.c:803:13: warning: assignment makes pointer from integer without a cast [enabled by default]

string2 = PyString_AS_STRING(arg2);

^
In file included from /yuwei/anaconda3/include/python3.7m/pytime.h:6:0,

from /yuwei/anaconda3/include/python3.7m/Python.h:87,

from Levenshtein.c:99:

Levenshtein.c: In function ‘jaro_winkler_py’:

Levenshtein.c:846:33: error: ‘PyString_Type’ undeclared (first use in this function)

if (PyObject_TypeCheck(arg1, &PyString_Type)

^
/yuwei/anaconda3/include/python3.7m/object.h:487:22: note: in definition of macro ‘PyObject_TypeCheck’

(Py_TYPE(ob) == (tp) || PyType_IsSubtype(Py_TYPE(ob), (tp)))

^
Levenshtein.c:852:13: warning: assignment makes pointer from integer without a cast [enabled by default]

string1 = PyString_AS_STRING(arg1);

^
Levenshtein.c:853:13: warning: assignment makes pointer from integer without a cast [enabled by default]

string2 = PyString_AS_STRING(arg2);

^
Levenshtein.c: In function ‘median_common’:

Levenshtein.c:954:7: warning: implicit declaration of function ‘PyString_FromStringAndSize’ [-Wimplicit-function-declaration]

result = PyString_FromStringAndSize(medstr, len);

^
Levenshtein.c:954:14: warning: assignment makes pointer from integer without a cast [enabled by default]

result = PyString_FromStringAndSize(medstr, len);

^
In file included from /yuwei/anaconda3/include/python3.7m/pytime.h:6:0,

from /yuwei/anaconda3/include/python3.7m/Python.h:87,

from Levenshtein.c:99:

Levenshtein.c: In function ‘median_improve_common’:

Levenshtein.c:993:33: error: ‘PyString_Type’ undeclared (first use in this function)

if (PyObject_TypeCheck(arg1, &PyString_Type))

^
/yuwei/anaconda3/include/python3.7m/object.h:487:22: note: in definition of macro ‘PyObject_TypeCheck’

(Py_TYPE(ob) == (tp) || PyType_IsSubtype(Py_TYPE(ob), (tp)))

^
Levenshtein.c:1033:19: warning: initialization makes pointer from integer without a cast [enabled by default]

lev_byte *s = PyString_AS_STRING(arg1);

^
Levenshtein.c:1039:14: warning: assignment makes pointer from integer without a cast [enabled by default]

result = PyString_FromStringAndSize(medstr, len);

^
Levenshtein.c: In function ‘extract_weightlist’:

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