Myashka/SO-Python_QA-filtered-2023-tanh_score-after_2023_02 huggingface dataset:
Title: Pycairo error while deploying django app on AWS
Tags: python,django,amazon-elastic-beanstalk

Question: My app is deployed on AWS ElasticBeanStalk was working fine up until one hour ago and now it is giving 502 Bad gateway error. When I tried to redeploy the application it gives me the following error
2023/05/05 07:41:44.917340 [ERROR] An error occurred during execution of command [self-startup] - [InstallDependency]. Stop running the command. Error: fail to install dependencies with requirements.txt file with error Command /bin/sh -c /var/app/venv/staging-LQM1lest/bin/pip install -r requirements.txt failed with error exit status 1. Stderr:  error: subprocess-exited-with-error
  
  × Building wheel for pycairo (pyproject.toml) did not run successfully.
  │ exit code: 1
  ╰─> [15 lines of output]
      running bdist_wheel
      running build
      running build_py
      creating build
      creating build/lib.linux-x86_64-cpython-38
      creating build/lib.linux-x86_64-cpython-38/cairo
      copying cairo/__init__.py -> build/lib.linux-x86_64-cpython-38/cairo
      copying cairo/__init__.pyi -> build/lib.linux-x86_64-cpython-38/cairo
      copying cairo/py.typed -> build/lib.linux-x86_64-cpython-38/cairo
      running build_ext
      Package cairo was not found in the pkg-config search path.
      Perhaps you should add the directory containing `cairo.pc'
      to the PKG_CONFIG_PATH environment variable
      No package 'cairo' found
      Command '['pkg-config', '--print-errors', '--exists', 'cairo >= 1.15.10']' returned non-zero exit status 1.
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building wheel for pycairo
ERROR: Could not build wheels for pycairo, which is required to install pyproject.toml-based projects
 

I don't even have Pycairo in my requirements.txt. Is there any dependency using this in the background, if so How can I find it and resolve this?
I added cairo in .ebextensions as well but it's of no use
requirements.txt
asgiref==3.2.7
Django==3.0.5
django-cors-headers==3.2.1
djangorestframework==3.11.0
djangorestframework-simplejwt==4.4.0
PyJWT==1.7.1
pytz==2020.1
sqlparse==0.3.1
djangorestframework-jwt
django-storages
boto3==1.11.4
zplgrf
reportlab
pandas==1.4.2
python-barcode
pretty_html_table
folium
googlemaps
pyexcel
pyexcel_xls
pyexcel-xlsx
openpyxl
gunicorn
apscheduler
django-smtp-ssl
xlsxwriter
django-simple-search
gmplot
awscrt
awsiotsdk
psycopg2-binary==2.8.6

Answer: If you have xhtml2pdf in your requirements, try installing first reportlab==3.6.13 and then xhtml2pdf==0.2.10
Title: Trying to convert a date to another format gives error
Tags: python,date

Question: I have a program where the user selects a date from a datepicker, and I need to convert this date to another format.
The original format is %d/%m/%Y and I need to convert it to %-d-%b-%Y
I made a small example of what happens
from datetime import datetime
# Import tkinter library
from tkinter import *
from tkcalendar import Calendar, DateEntry

win = Tk()
win.geometry("750x250")
win.title("Example")


def convert():
    date1 = cal.get()
    datetimeobject = datetime.strptime(date1, '%d/%m/%Y')
    print(date1)
    new_format = datetimeobject.strftime('%-d-%b-%Y')
    print(new_format)


cal = DateEntry(win, width=16, background="gray61", foreground="white", bd=2, date_pattern='dd/mm/y')
cal.pack(pady=20)

btn = Button(win, command=convert, text='PRESS')
btn.pack(pady=50)

win.mainloop()

This gives me the following error
  File "---------\date.py", line 15, in convert
    new_format = datetimeobject.strftime('%-d-%b-%Y')
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: Invalid format string

Answer: The error is due to the use of the %-d format specifier in the strftime() method. This specifier is not supported in the Windows platform.
To resolve this issue, you can replace the %-d format specifier with %d and remove the -.
Title: Trying to convert a date to another format gives error
Tags: python,date

Question: I have a program where the user selects a date from a datepicker, and I need to convert this date to another format.
The original format is %d/%m/%Y and I need to convert it to %-d-%b-%Y
I made a small example of what happens
from datetime import datetime
# Import tkinter library
from tkinter import *
from tkcalendar import Calendar, DateEntry

win = Tk()
win.geometry("750x250")
win.title("Example")


def convert():
    date1 = cal.get()
    datetimeobject = datetime.strptime(date1, '%d/%m/%Y')
    print(date1)
    new_format = datetimeobject.strftime('%-d-%b-%Y')
    print(new_format)


cal = DateEntry(win, width=16, background="gray61", foreground="white", bd=2, date_pattern='dd/mm/y')
cal.pack(pady=20)

btn = Button(win, command=convert, text='PRESS')
btn.pack(pady=50)

win.mainloop()

This gives me the following error
  File "---------\date.py", line 15, in convert
    new_format = datetimeobject.strftime('%-d-%b-%Y')
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: Invalid format string

Answer: The reason why that gives an error is because %-d only works on Unix machines (Linux, MacOS). On Windows (or Cygwin), you have to use %#d.