cython

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# From https://docs.python.org/3/c-api/conversion.html
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from .object cimport PyObject
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cdef extern from "Python.h":
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    ctypedef struct va_list
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    int PyOS_snprintf(char *str, size_t size, const char *format, ...)
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    # Output not more than size bytes to str according to the format
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    # string format and the extra arguments. See the Unix man page snprintf(2).
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    int PyOS_vsnprintf(char *str, size_t size, const char *format, va_list va)
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    # Output not more than size bytes to str according to the format
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    # string format and the variable argument list va. Unix man page vsnprintf(2).
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    double PyOS_string_to_double(const char *s, char **endptr, PyObject *overflow_exception) except? -1.0
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    # Convert a string s to a double, raising a Python exception on failure. The set of
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    # accepted strings corresponds to the set of strings accepted by Python’s float()
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    # constructor, except that s must not have leading or trailing whitespace.
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    # The conversion is independent of the current locale.
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    enum:
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        Py_DTSF_SIGN
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        Py_DTSF_ADD_DOT_0
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        Py_DTSF_ALT
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    char* PyOS_double_to_string(double val, char format_code, int precision, int flags, int *ptype) except NULL
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    # Convert a double val to a string using supplied format_code, precision, and flags.
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    int PyOS_stricmp(const char *s1, const char *s2)
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    # Case insensitive comparison of strings. The function works almost identically
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    # to strcmp() except that it ignores the case.
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    int PyOS_strnicmp(const char *s1, const char *s2, Py_ssize_t  size)
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    # Case insensitive comparison of strings. The function works almost identically
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    # to strncmp() except that it ignores the case.
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