Fixes for @jbrockmendel review V1

Author: MomIsBestFriend

Diff for: pandas/_libs/tslibs/c_timestamp.pyx

@@ -54,11 +54,11 @@ class NullFrequencyError(ValueError):
 def maybe_integer_op_deprecated(obj):
     # GH#22535 add/sub of integers and int-arrays is deprecated
     if obj.freq is not None:
-        warnings.warn(f"Addition/subtraction of integers and integer-arrays "
+        warnings.warn("Addition/subtraction of integers and integer-arrays "
                       f"to {type(obj).__name__} is deprecated, "
-                      f"will be removed in a future "
-                      f"version.  Instead of adding/subtracting `n`, use "
-                      f"`n * self.freq`"
+                      "will be removed in a future "
+                      "version.  Instead of adding/subtracting `n`, use "
+                      "`n * self.freq`"
                       , FutureWarning)
 
 
@@ -369,13 +369,13 @@ cdef class _Timestamp(datetime):
 
     @property
     def _repr_base(self) -> str:
-        return f'{self._date_repr} {self._time_repr}'
+        return f"{self._date_repr} {self._time_repr}"
 
     @property
     def _date_repr(self) -> str:
         # Ideal here would be self.strftime("%Y-%m-%d"), but
         # the datetime strftime() methods require year >= 1900
-        return f'{self.year}-{self.month:02d}-{self.day:02d}'
+        return f"{self.year}-{self.month:02d}-{self.day:02d}"
 
     @property
     def _time_repr(self) -> str:

Diff for: pandas/_libs/tslibs/parsing.pyx

@@ -707,8 +707,8 @@ class _timelex:
             self.stream = instream
         elif getattr(instream, 'read', None) is None:
             raise TypeError(
-                f'Parser must be a string or character stream, not '
-                f'{instream.__class__.__name__}')
+                'Parser must be a string or character stream, not '
+                f'{type(instream).__name__}')
         else:
             self.stream = instream.read()
 

Diff for: pandas/_libs/tslibs/period.pyx

@@ -1275,15 +1275,15 @@ cdef object _period_strftime(int64_t value, int freq, object fmt):
             if i == 0:
                 repl = str(quarter)
             elif i == 1:  # %f, 2-digit year
-                repl = f'{year % 100:02d}'
+                repl = f'{(year % 100):02d}'
             elif i == 2:
                 repl = str(year)
             elif i == 3:
-                repl = f'{value % 1_000:03d}'
+                repl = f'{(value % 1_000):03d}'
             elif i == 4:
-                repl = f'{value % 1_000_000:06d}'
+                repl = f'{(value % 1_000_000):06d}'
             elif i == 5:
-                repl = f'{value % 1_000_000_000:09d}'
+                repl = f'{(value % 1_000_000_000):09d}'
 
             result = result.replace(str_extra_fmts[i], repl)
 
@@ -2223,7 +2223,7 @@ cdef class _Period:
         """
         base, mult = get_freq_code(self.freq)
         formatted = period_format(self.ordinal, base)
-        value = f"{formatted}"
+        value = str(formatted)
         return value
 
     def __setstate__(self, state):

Diff for: pandas/_libs/tslibs/strptime.pyx

@@ -139,8 +139,8 @@ def array_strptime(object[:] values, object fmt,
                 if is_coerce:
                     iresult[i] = NPY_NAT
                     continue
-                raise ValueError(f"time data {repr(val)} does not match "
-                                 f"format {repr(fmt)} (match)")
+                raise ValueError(f"time data '{val}' does not match "
+                                 f"format '{fmt}' (match)")
             if len(val) != found.end():
                 if is_coerce:
                     iresult[i] = NPY_NAT
@@ -588,8 +588,8 @@ class TimeRE(dict):
         else:
             return ''
         regex = '|'.join(re.escape(stuff) for stuff in to_convert)
-        regex = f'(?P<{directive}>{regex}'
-        return f'{regex})'
+        regex = f'(?P<{directive}>{regex})'
+        return regex
 
     def pattern(self, format):
         """

Diff for: pandas/_libs/tslibs/timedeltas.pyx

@@ -1136,7 +1136,8 @@ cdef class _Timedelta(timedelta):
         return fmt.format(**comp_dict)
 
     def __repr__(self) -> str:
-        return f"Timedelta('{self._repr_base(format='long')}')"
+        repr_based = self._repr_base(format='long')
+        return f"Timedelta('{repr_based}')"
 
     def __str__(self) -> str:
         return self._repr_base(format='long')