CLN: Remove have_pytz (#17266)

Closes gh-17251

Author: jbrockmendel

pandas/_libs/index.pyx

@@ -32,13 +32,9 @@ cdef extern from "datetime.h":
 
 cdef int64_t iNaT = util.get_nat()
 
-try:
-    from dateutil.tz import tzutc as _du_utc
-    import pytz
-    UTC = pytz.utc
-    have_pytz = True
-except ImportError:
-    have_pytz = False
+from dateutil.tz import tzutc as _du_utc
+import pytz
+UTC = pytz.utc
 
 PyDateTime_IMPORT
 

pandas/_libs/period.pyx

@@ -3,8 +3,7 @@ import operator
 
 from cpython cimport (
     PyObject_RichCompareBool,
-    Py_EQ, Py_NE,
-)
+    Py_EQ, Py_NE)
 
 from numpy cimport (int8_t, int32_t, int64_t, import_array, ndarray,
                     NPY_INT64, NPY_DATETIME, NPY_TIMEDELTA)
@@ -24,14 +23,13 @@ cimport util, lib
 from lib cimport is_null_datetimelike, is_period
 from pandas._libs import tslib, lib
 from pandas._libs.tslib import (Timedelta, Timestamp, iNaT,
-                                NaT, have_pytz, _get_utcoffset)
+                                NaT, _get_utcoffset)
 from tslib cimport (
     maybe_get_tz,
     _is_utc,
     _is_tzlocal,
     _get_dst_info,
-    _nat_scalar_rules,
-)
+    _nat_scalar_rules)
 
 from pandas.tseries import offsets
 from pandas.core.tools.datetimes import parse_time_string
@@ -610,9 +608,6 @@ cdef ndarray[int64_t] localize_dt64arr_to_period(ndarray[int64_t] stamps,
         ndarray[int64_t] trans, deltas, pos
         pandas_datetimestruct dts
 
-    if not have_pytz:
-        raise Exception('Could not find pytz module')
-
     if _is_utc(tz):
         for i in range(n):
             if stamps[i] == NPY_NAT:

pandas/_libs/tslib.pyx

@@ -4080,12 +4080,8 @@ def i8_to_pydt(int64_t i8, object tzinfo = None):
 #----------------------------------------------------------------------
 # time zone conversion helpers
 
-try:
-    import pytz
-    UTC = pytz.utc
-    have_pytz = True
-except:
-    have_pytz = False
+import pytz
+UTC = pytz.utc
 
 
 @cython.boundscheck(False)
@@ -4112,9 +4108,6 @@ def tz_convert(ndarray[int64_t] vals, object tz1, object tz2):
         int64_t v, offset, delta
         pandas_datetimestruct dts
 
-    if not have_pytz:
-        import pytz
-
     if len(vals) == 0:
         return np.array([], dtype=np.int64)
 
@@ -4229,9 +4222,6 @@ def tz_convert_single(int64_t val, object tz1, object tz2):
         int64_t v, offset, utc_date
         pandas_datetimestruct dts
 
-    if not have_pytz:
-        import pytz
-
     if val == NPY_NAT:
         return val
 
@@ -4444,9 +4434,6 @@ def tz_localize_to_utc(ndarray[int64_t] vals, object tz, object ambiguous=None,
 
     assert is_coerce or is_raise
 
-    if not have_pytz:
-        raise Exception("Could not find pytz module")
-
     if tz == UTC or tz is None:
         return vals