A date loop problem and list remove problem on JupyterLab-CodePudding

Hello everyone, I encountered a date looping problem on JupyterLab, the problem is as shown in the attached picture:

It is very strange that the red circle of B should be displayed the same as the red circle of A. Why is week 6 missing?

And "if d.weekday() in [5, 6]: dates.remove(d)". It should be 5 and 6 removed, how can there be 4/3 and 4/10?

I have restarted the core and the result is the same. It's amazing...

CodePudding user response：

You should not modify the list dates while iterating over it. Please check Strange result when removing item from a list while iterating over it for more details.

To removes dates which are Saturdays or Sundays, try this:

import pandas as pd 
from datetime import datetime
from datetime import timedelta

d = datetime(2022, 4, 1)
dates = [d   timedelta(days=idx) for idx in range(10)]

for d in dates:
    print(f'{d.date()}  {d.weekday()}' )

new_dates = dates.copy()
for d in dates:
    if d.weekday() in [5, 6]:
        new_dates.remove(d)

print("Removed Saturdays and Sundays!")

for d in new_dates:
    print(f'{d.date()}  {d.weekday()}' )

This gives:

2022-04-01  4
2022-04-02  5
2022-04-03  6
2022-04-04  0
2022-04-05  1
2022-04-06  2
2022-04-07  3
2022-04-08  4
2022-04-09  5
2022-04-10  6
Removed Saturdays and Sundays!
2022-04-01  4
2022-04-04  0
2022-04-05  1
2022-04-06  2
2022-04-07  3
2022-04-08  4