Remove unused cimports, fix #22067

pandas/_libs/hashing.pyx

@@ -3,7 +3,7 @@
 # at https://github.com/veorq/SipHash
 
 import cython
-cimport numpy as cnp
+
 import numpy as np
 from numpy cimport ndarray, uint8_t, uint32_t, uint64_t
 

pandas/_libs/tslibs/frequencies.pyx

@@ -2,8 +2,6 @@
 # cython: profile=False
 import re
 
-cimport cython
-
 cimport numpy as cnp
 cnp.import_array()
 

pandas/_libs/tslibs/parsing.pyx

@@ -14,9 +14,7 @@ from cpython.datetime cimport datetime
 import time
 
 import numpy as np
-cimport numpy as cnp
-from numpy cimport int64_t, ndarray
-cnp.import_array()
+from numpy cimport ndarray
 
 # Avoid import from outside _libs
 if sys.version_info.major == 2:

pandas/_libs/tslibs/period.pyx

@@ -1920,8 +1920,8 @@ class Period(_Period):
         return cls._from_ordinal(ordinal, freq)
 
 
-cdef int64_t _ordinal_from_fields(year, month, quarter, day,
-                                  hour, minute, second, freq):
+cdef int64_t _ordinal_from_fields(int year, int month, quarter, int day,
+                                  int hour, int minute, int second, freq):
     base, mult = get_freq_code(freq)
     if quarter is not None:
         year, month = quarter_to_myear(year, quarter, freq)

pandas/_libs/tslibs/resolution.pyx

@@ -5,9 +5,7 @@ cimport cython
 from cython cimport Py_ssize_t
 
 import numpy as np
-cimport numpy as cnp
 from numpy cimport ndarray, int64_t, int32_t
-cnp.import_array()
 
 from util cimport is_string_object, get_nat
 

pandas/_libs/tslibs/strptime.pyx

@@ -25,8 +25,6 @@ import pytz
 from cython cimport Py_ssize_t
 from cpython cimport PyFloat_Check
 
-cimport cython
-
 import numpy as np
 from numpy cimport ndarray, int64_t
 

pandas/_libs/window.pyx

@@ -9,7 +9,7 @@ from libc.stdlib cimport malloc, free
 
 import numpy as np
 cimport numpy as cnp
-from numpy cimport ndarray, double_t, int64_t, float64_t
+from numpy cimport ndarray, double_t, int64_t, float64_t, float32_t
 cnp.import_array()
 
 
@@ -25,11 +25,11 @@ from skiplist cimport (skiplist_t,
                        skiplist_init, skiplist_destroy,
                        skiplist_get, skiplist_insert, skiplist_remove)
 
-cdef cnp.float32_t MINfloat32 = np.NINF
-cdef cnp.float64_t MINfloat64 = np.NINF
+cdef float32_t MINfloat32 = np.NINF
+cdef float64_t MINfloat64 = np.NINF
 
-cdef cnp.float32_t MAXfloat32 = np.inf
-cdef cnp.float64_t MAXfloat64 = np.inf
+cdef float32_t MAXfloat32 = np.inf
+cdef float64_t MAXfloat64 = np.inf
 
 cdef double NaN = <double> np.NaN
 

pandas/_libs/writers.pyx

@@ -12,9 +12,7 @@ except ImportError:
     from cpython cimport PyUnicode_GET_SIZE as PyString_GET_SIZE
 
 import numpy as np
-cimport numpy as cnp
 from numpy cimport ndarray, uint8_t
-cnp.import_array()
 
 
 ctypedef fused pandas_string:

pandas/io/msgpack/_packer.pyx

@@ -1,10 +1,16 @@
 # coding: utf-8
 # cython: embedsignature=True
 
-from cpython cimport *
-from libc.stdlib cimport *
-from libc.string cimport *
-from libc.limits cimport *
+from cpython cimport (
+    PyFloat_Check, PyLong_Check, PyInt_Check,
+    PyDict_CheckExact, PyDict_Check,
+    PyTuple_Check, PyList_Check,
+    PyCallable_Check,
+    PyUnicode_Check, PyBytes_Check,
+    PyBytes_AsString,
+    PyBytes_FromStringAndSize,
+    PyUnicode_AsEncodedString)
+from libc.stdlib cimport free, malloc
 
 from pandas.io.msgpack.exceptions import PackValueError
 from pandas.io.msgpack import ExtType
@@ -74,7 +80,7 @@ cdef class Packer(object):
     cdef object _berrors
     cdef char *encoding
     cdef char *unicode_errors
-    cdef bool use_float
+    cdef bint use_float
     cdef bint autoreset
 
     def __cinit__(self):

pandas/io/msgpack/_unpacker.pyx

@@ -1,15 +1,23 @@
 # coding: utf-8
 # cython: embedsignature=True
 
-from cpython cimport *
+from cython cimport Py_ssize_t
+
+from cpython cimport (
+    PyCallable_Check,
+    PyBUF_SIMPLE, PyObject_GetBuffer, PyBuffer_Release,
+    PyBytes_Size,
+    PyBytes_FromStringAndSize,
+    PyBytes_AsString)
+
 cdef extern from "Python.h":
     ctypedef struct PyObject
     cdef int PyObject_AsReadBuffer(object o, const void** buff,
                                    Py_ssize_t* buf_len) except -1
 
-from libc.stdlib cimport *
-from libc.string cimport *
-from libc.limits cimport *
+from libc.stdlib cimport free, malloc
+from libc.string cimport memcpy, memmove
+from libc.limits cimport INT_MAX
 
 from pandas.io.msgpack.exceptions import (BufferFull, OutOfData,
                                           UnpackValueError, ExtraData)

pandas/io/sas/sas.pyx

@@ -2,8 +2,7 @@
 # cython: boundscheck=False, initializedcheck=False
 
 import numpy as np
-cimport numpy as cnp
-from numpy cimport uint8_t, uint16_t, int8_t, int64_t, ndarray
+from numpy cimport uint8_t, uint16_t, int64_t, ndarray
 import sas_constants as const
 
 # rle_decompress decompresses data using a Run Length Encoding