Description
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I have checked that this issue has not already been reported.
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I have confirmed this bug exists on the latest version of pandas.
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Note: Please read this guide detailing how to provide the necessary information for us to reproduce your bug.
Code Sample, a copy-pastable example
#! /usr/bin/env python
# -*- coding: utf-8 -*-
import pandas as pd
import codecs
x = [ 1, 2, 3, 4, 5 ]
y = [ 6, 7, 8, 9, 10 ]
z = [ 'a', 'b', 'c', 'd', 'e' ]
data = { "X": x, "Y":y, "Z":z }
df = pd.DataFrame( data, columns=[ "X", "Y", "Z" ] )
print( "Pandas version = %s" % pd.__version__ )
print(df)
fp = codecs.open( "out-testPD12.csv", "w", "utf-8" )
fp.write( "Pandas version = %s\n" % pd.__version__ )
df.to_csv( fp, index=False, header=True )
fp.close()Problem description
When saving the file, TypeError: utf_8_encode() argument 1 must be str, not bytes flags on.
Expected Output
The output below has been obtained by downgrading and pinned Pandas to V1.1.5.
V1.1.2 is also tested OK.
Pandas version = 1.1.5
X,Y,Z
1,6,a
2,7,b
3,8,c
4,9,d
5,10,e
Output of pd.show_versions()
INSTALLED VERSIONS
commit : 3e89b4c
python : 3.8.2.final.0
python-bits : 64
OS : Darwin
OS-release : 19.6.0
Version : Darwin Kernel Version 19.6.0: Tue Nov 10 00:10:30 PST 2020; root:xnu-6153.141.10~1/RELEASE_X86_64
machine : x86_64
processor : i386
byteorder : little
LC_ALL : None
LANG : None
LOCALE : None.UTF-8
pandas : 1.2.0
numpy : 1.19.2
pytz : 2020.5
dateutil : 2.8.1
pip : 20.3.3
setuptools : 51.1.2.post20210112
Cython : 0.29.21
pytest : 6.2.1
hypothesis : None
sphinx : 3.4.3
blosc : None
feather : None
xlsxwriter : 1.3.7
lxml.etree : 4.6.2
html5lib : 1.1
pymysql : None
psycopg2 : None
jinja2 : 2.11.2
IPython : 7.19.0
pandas_datareader: None
bs4 : 4.9.3
bottleneck : 1.3.2
fsspec : 0.8.3
fastparquet : None
gcsfs : None
matplotlib : 3.3.2
numexpr : 2.7.2
odfpy : None
openpyxl : 3.0.6
pandas_gbq : None
pyarrow : None
pyxlsb : None
s3fs : None
scipy : 1.5.2
sqlalchemy : 1.3.21
tables : 3.6.1
tabulate : None
xarray : None
xlrd : 2.0.1
xlwt : 1.3.0
numba : 0.51.2
(base) Catalina1{kazzz-s} temp (1)% python testPD12.py
Pandas version = 1.2.0
X Y Z
0 1 6 a
1 2 7 b
2 3 8 c
3 4 9 d
4 5 10 e
Traceback (most recent call last):
File "testPD12.py", line 52, in <module>
df.to_csv( fp, index=False, header=True )
File "/Users/kazzz-s/opt/anaconda3/lib/python3.8/site-packages/pandas/core/generic.py", line 3384, in to_csv
return DataFrameRenderer(formatter).to_csv(
File "/Users/kazzz-s/opt/anaconda3/lib/python3.8/site-packages/pandas/io/formats/format.py", line 1083, in to_csv
csv_formatter.save()
File "/Users/kazzz-s/opt/anaconda3/lib/python3.8/site-packages/pandas/io/formats/csvs.py", line 248, in save
self._save()
File "/Users/kazzz-s/opt/anaconda3/lib/python3.8/site-packages/pandas/io/common.py", line 104, in __exit__
self.close()
File "/Users/kazzz-s/opt/anaconda3/lib/python3.8/site-packages/pandas/io/common.py", line 89, in close
self.handle.flush()
File "/Users/kazzz-s/opt/anaconda3/lib/python3.8/codecs.py", line 721, in write
return self.writer.write(data)
File "/Users/kazzz-s/opt/anaconda3/lib/python3.8/codecs.py", line 377, in write
data, consumed = self.encode(object, self.errors)
TypeError: utf_8_encode() argument 1 must be str, not bytes