To fix this issue, refer to the app name when running the code
python manage.py makemigrations name_of_appThe correct app name can be found from the app.py file
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Category: Uncategorized
Tkinter TreeView – Enable Sorting upon Clicking Column Headings
The below code snippet can help you achieve the Sorting Option on Treeview Column Headings in Tkinter in both ascending and descending order.
columns = ("Student","Course","Last Session")
tv = Treeview(popup, show='headings', columns=columns,height=25)
def treeview_sort_column(tv, col, reverse):
l = [(tv.set(k, col), k) for k in tv.get_children('')]
l.sort(reverse=reverse)
# rearrange items in sorted positions
for index, (val, k) in enumerate(l):
tv.move(k, '', index)
# reverse sort next time
tv.heading(col, command=lambda _col=col: treeview_sort_column(tv, _col, not reverse))
for col in columns:
tv.heading(col, text=col,command=lambda _col=col: treeview_sort_column(tv, _col, False))
tv.pack()
ModuleNotFoundError: No module named ‘babel.numbers’
Traceback (most recent call last):
File "tkinter/__init__.py", line 1705, in __call__
File "script.py", line 726, in
File "script.py", line 536, in calendar
File "tkcalendar/calendar_.py", line 211, in __init__
File "babel/dates.py", line 314, in get_day_names
File "babel/core.py", line 641, in days
File "babel/core.py", line 364, in _data
File "babel/localedata.py", line 111, in load
File "babel/localedata.py", line 111, in load
File "babel/localedata.py", line 117, in load
ModuleNotFoundError: No module named 'babel.numbers'
Solution Explained
Locate the tkcalendar folder under venv/lib/python3.x/site-packages of your project folder.
Under calendar.py, add an additional import for the missing module.
import calendar
from babel.dates import format_date, parse_date, get_day_names, get_month_names
from babel.numbers import * # Additional Import
Mac OS X – ValueError: unknown locale: UTF-8
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/locale.py", line 568, in getdefaultlocale
return _parse_localename(localename)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/locale.py", line 495, in _parse_localename
raise ValueError('unknown locale: %s' % localename)
ValueError: unknown locale: UTF-8
To Solve the above issue you will need to add the below variables in your .profile or .bash_profile
export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8
From the Launchpad, open the Terminal
Type nano .profile
Nano is an easy to use editor
Copy the below lines of code
export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8
Press Ctrl+O to save the lines
Press Return to Save
Press Ctrl+X to Exit
To verify that the variables have been added to the .profile, use the below code in the terminal
open -e .profile
Try running your program once again. If the issue has not been resolved, use the same approach with the file .bash_profile
Get Pyinstaller to import ttkthemes
Operating System: Mac OS
The below solution worked perfectly
Step 1
pyinstaller script_name.py --hidden-import ttkthemes
Step 2
Copy the ttkthemes folder from venv/lib/python3.x/site-packages folder in your distribution folder (dist)
gspread timeout – Reconnecting to the Google API
gspread loses connection with the Google API probably every 10 minutes. This can be easily tackled by calling a function or Class which reconnects to the database.
import gspread
from oauth2client.service_account import ServiceAccountCredentials
from datetime import datetime
from datetime import timedelta
def connect_database():
scope = ['https://spreadsheets.google.com/feeds', 'https://www.googleapis.com/auth/drive']
creds = ServiceAccountCredentials.from_json_keyfile_name('client_secret.json', scope)
client = gspread.authorize(creds)
workbook1 = client.open("File_Name")
w1 = workbook1.worksheet("Sheet1")
w2 = workbook1.worksheet("Sheet2")
return w1,w2
program_start_time=datetime.now()
if datetime.now() > program_start_time + timedelta(minutes=10):
worksheet1, worksheet2 = connect_database()
program_start_time = datetime.now() #Resets the Program Start Time
gspread – Add Formula to Google Spreadsheet Cells
gspread documentation does not have any examples of adding formulas to the cells. If you try to use them with append_row or update_cell methods it records them as a string and not as a Formula.
You should instead use the update_cell method
Updating a Single Cell, considering you know the exact Row and Column Number
worksheet2.update_acell('A45','=SUM(D45:F45)')
Updating a Single Cell, considering you the exact Row and Column Number are not known
cell = worksheet2.find("David Letterman")
row_number = cell.row
workbook2_row='A'+str(row_number)
worksheet2.update_acell(workbook2_row,'=INDIRECT(CONCATENATE("D",ROW()))-INDIRECT(CONCATENATE("E",ROW()))')
