Función Isoweekday() de la clase Datetime.date en Python

isoweekday() es una función que devuelve un número entero que indica que cae la fecha dada. El número entero que devuelve representa un día según la tabla que se muestra a continuación.

Sintaxis: datetime.isoweekday()

Valor devuelto: un número entero en el rango de [1,7]

Ejemplo 1: este programa toma la fecha usando el módulo DateTime y le dice el día de la fecha.

# importing the datetime module
import datetime
  
# Creating an list which will
# be  used to retrieve the day of the
# week using the return value of the
# isoweekday() function
DaysList  = ["None",
              "Monday",
            "Tuesday",
            "Wednesday",
            "Thursday",
            "Friday",
            "Saturday",
            "Sunday"]
  
# Using the function today()
# to get today's date
CurrentDate = datetime.date.today()
print("Current Date is :", CurrentDate)
  
# Using the isoweekday() function to
# retrieve the day of the given date
day = CurrentDate.isoweekday()
print("The date", CurrentDate, "falls on",
      DaysList[day])

Producción:

Current Date is : 2021-08-18
The date 2021-08-18 falls on Wednesday

Ejemplo 2: En este ejemplo, tomaremos la entrada del usuario para una fecha y devolveremos el día en que cae.

# importing the datetime module
import datetime
 
# Creating an dictionary with the return
# value as keys and the day as the value
# This is used to retrieve the day of the week
# using the return value of the isoweekday()
# function
DaysList = ["None",
            "Monday",
            "Tuesday",
            "Wednesday",
            "Thursday",
            "Friday",
            "Saturday",
            "Sunday"]
 
# Getting the  user's input
day = 18
month = 9
year = 2020
 
# Creating the datetime object for the user's
# input by using the date() function of datetime
# class
Date = datetime.date(year, month, day)
 
# Using the isoweekday() function
# to retrieve the day of the given date
day = Date.isoweekday()
 
print("The given date", Date, "falls on",
      DaysList[day])

Producción:

The given date 2020-09-18 falls on Friday

Ejemplo 3: En este ejemplo, tomaremos la entrada del usuario para la fecha y el día en que cae y devolveremos si eso es cierto o no

# importing the datetime module
import datetime
 
# Creating an dictionary with the return
# value as keys and the day as the value
# This is used to retrieve the day of the week
# using the return value of the isoweekday()
# function
DaysList = ["None",
            "Monday",
            "Tuesday",
            "Wednesday",
            "Thursday",
            "Friday",
            "Saturday",
            "Sunday"]
 
# Getting the  user's input
day = 1
month = 1
year = 2021
day_fallen = "Friday"
 
# Creating the datetime object for the user's
# input by using the date() function of datetime
# class
Date = datetime.date(year, month, day)
 
# Using the isoweekday() function
# to retrieve the day of the given date
day = Date.isoweekday()
 
# Checking if the day is matching the user's
# day
if day_fallen.lower() == DaysList[day].lower():
    print("Yes, your given date", Date,
          "falls on your expected day i.e ",
          DaysList[day])
else:
    print("No, your given date", Date, "falls on",
          DaysList[day],
          "but not on", day_fallen)

Producción:

Sí, su fecha dada 2021-01-01 cae en su día esperado, es decir, viernes