In [2]: import pandas as pd
In [3]: pd.__version__
Out[3]: '2.1.0'
In [4]: import decimal
In [6]: import numpy as np
In [7]: pdf = pd.DataFrame(
   ...:         {
   ...:             "a": [1.2234242333234, 323432.3243423, np.nan],
   ...:             "b": ["a", "b", "c"],
   ...:             "c": pd.Series([34224, 324324, 324342], dtype="datetime64[ns]"),
   ...:             "d": pd.Series([224.242, None, 2424.234324], dtype="category"),
   ...:             "e": [
   ...:                 decimal.Decimal("342.3243234234242"),
   ...:                 decimal.Decimal("89.32432497687622"),
   ...:                 None,
   ...:             ],
   ...:         }
   ...:     )
In [8]: round(pdf, 2)
Out[8]: 
           a  b                             c            d                  e
0       1.22  a 1970-01-01 00:00:00.000034224   224.242000  342.3243234234242
1  323432.32  b 1970-01-01 00:00:00.000324324          NaN  89.32432497687622
2        NaN  c 1970-01-01 00:00:00.000324342  2424.234324               None
In [9]: round(pdf.a, 2)
Out[9]: 
0         1.22
1    323432.32
2          NaN
Name: a, dtype: float64
In [10]: round(pdf.b, 2)
Traceback (most recent call last):
  File "/Users/pgali/PycharmProjects/pythonProject/venv/lib/python3.10/site-packages/IPython/core/interactiveshell.py", line 3378, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-10-9c75601ee514>", line 1, in <module>
    round(pdf.b, 2)
  File "/Users/pgali/PycharmProjects/pythonProject/venv/lib/python3.10/site-packages/pandas/core/generic.py", line 1663, in __round__
    return self.round(decimals).__finalize__(self, method="__round__")
  File "/Users/pgali/PycharmProjects/pythonProject/venv/lib/python3.10/site-packages/pandas/core/series.py", line 2688, in round
    result = self._values.round(decimals)
TypeError: can't multiply sequence by non-int of type 'float'
In [11]: round(pdf.c, 2)
Traceback (most recent call last):
  File "/Users/pgali/PycharmProjects/pythonProject/venv/lib/python3.10/site-packages/IPython/core/interactiveshell.py", line 3378, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-11-6d1f4094de81>", line 1, in <module>
    round(pdf.c, 2)
  File "/Users/pgali/PycharmProjects/pythonProject/venv/lib/python3.10/site-packages/pandas/core/generic.py", line 1663, in __round__
    return self.round(decimals).__finalize__(self, method="__round__")
  File "/Users/pgali/PycharmProjects/pythonProject/venv/lib/python3.10/site-packages/pandas/core/series.py", line 2688, in round
    result = self._values.round(decimals)
  File "/Users/pgali/PycharmProjects/pythonProject/venv/lib/python3.10/site-packages/pandas/core/arrays/datetimelike.py", line 2140, in round
    return self._round(freq, RoundTo.NEAREST_HALF_EVEN, ambiguous, nonexistent)
  File "/Users/pgali/PycharmProjects/pythonProject/venv/lib/python3.10/site-packages/pandas/core/arrays/datetimelike.py", line 2122, in _round
    offset = to_offset(freq)
  File "offsets.pyx", line 4460, in pandas._libs.tslibs.offsets.to_offset
  File "offsets.pyx", line 4562, in pandas._libs.tslibs.offsets.to_offset
ValueError: Invalid frequency: 2
In [12]: round(pdf.d, 2)
Traceback (most recent call last):
  File "/Users/pgali/PycharmProjects/pythonProject/venv/lib/python3.10/site-packages/IPython/core/interactiveshell.py", line 3378, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-12-9fba030eaf35>", line 1, in <module>
    round(pdf.d, 2)
  File "/Users/pgali/PycharmProjects/pythonProject/venv/lib/python3.10/site-packages/pandas/core/generic.py", line 1663, in __round__
    return self.round(decimals).__finalize__(self, method="__round__")
  File "/Users/pgali/PycharmProjects/pythonProject/venv/lib/python3.10/site-packages/pandas/core/series.py", line 2688, in round
    result = self._values.round(decimals)
AttributeError: 'Categorical' object has no attribute 'round'
In [13]: round(pdf.e, 2)
Traceback (most recent call last):
  File "/Users/pgali/PycharmProjects/pythonProject/venv/lib/python3.10/site-packages/IPython/core/interactiveshell.py", line 3378, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-13-d91def30b1e6>", line 1, in <module>
    round(pdf.e, 2)
  File "/Users/pgali/PycharmProjects/pythonProject/venv/lib/python3.10/site-packages/pandas/core/generic.py", line 1663, in __round__
    return self.round(decimals).__finalize__(self, method="__round__")
  File "/Users/pgali/PycharmProjects/pythonProject/venv/lib/python3.10/site-packages/pandas/core/series.py", line 2688, in round
    result = self._values.round(decimals)
TypeError: unsupported operand type(s) for *: 'decimal.Decimal' and 'float'


In [4]: round(decimal.Decimal("23234.323224"), 2)
Out[4]: Decimal('23234.32')