写一个 function 给定日期编号，并返回日期名称（字符串）

Question

Assume the days of the week are numbered 0,1,2,3,4,5,6 from Sunday to Saturday. Write a function which is given the day number, and it returns the day name (a string). Help me solve this tusk pls. And explain me pls why my code return me mistake: ValueError: invalid literal for int() with base 10: ''

d1 = "Понедельник"
d2 = "Вторник"
d3 = "Среда"
d4 = "Четверг"
d5 = "Пятница"
d6 = "Суббота"
d7 = "Воскресенье"

print (input ("Chose day of number: "))
x = int(input())

if x == 1:

       print (d1)

print("Program ended")

Answer 1

You've used the input function in the wrong way, please try something like this:

d1 = "Понедельник"
d2 = "Вторник"
d3 = "Среда"
d4 = "Четверг"
d5 = "Пятница"
d6 = "Суббота"
d7 = "Воскресенье"

x = int(input("Chose day of number: "))

if x == 1:
    print(d1)

print("Program ended")

I think you're a beginner. You can use dict , list etc. to make your program simpler.

Answer 2

A dictionary can be used for solving this requirement easily.

Here is the working solution that uses the Python dictionary:

# File name: Weekdays.py

weekDays = {
    1: "Понедельник",
    2: "Вторник",
    3: "Среда",
    4: "Четверг",
    5: "Пятница",
    6: "Суббота",
    7: "Воскресенье"
}


userInput = input("Choose a number for day (1 to 7): ")
if(userInput.isdigit() and (int(userInput) > 0) and (int(userInput) < 8)):
    n = int(userInput)
    print(weekDays[n])
else:
    print("Input must be a number between 1 and 7 only")

Output:

> python Weekdays.py
Choose a number for day (1 to 7): 6
Суббота

> python Weekdays.py
Choose a number for day (1 to 7): 1
Понедельник

> python Weekdays.py
Choose a number for day (1 to 7): 99
Input must be a number between 1 and 7 only

> python Weekdays.py
Choose a number for day (1 to 7): 0
Input must be a number between 1 and 7 only

> python Weekdays.py
Choose a number for day (1 to 7): 7
Воскресенье

Answer 3

try this one:

def days_func(day_index):
    days = {0: 'Monday', 1: 'Tuesday', 2: 'Wednesday', 3: 'Thursday', 4: 'Friday', 5: 'Saturday', 6: 'Sunday'}

    if day_index in range(0, 6):
        return days[day_index]
    else:
        message = 'Invalid Number, try again!'
        return message


try:
    day = int(input('Enter the number of a day : '))
    print(days_func(day))
except ValueError:
    print('Index must be Integer!')

Answer 4

Error because of other character than digit as input.Try to use dictionary to store data and fetch it as requirement. https://www.programiz.com/python-programming/dictionary