Python validate user input of multiple strings-CodePudding

I've been working on this all day and can't get it done. Any help will be much appreciated! In Python, I want to loop through 3 times asking the user to enter 1 or more days of the week (e.g., Please enter the day(s) of the week:) with the input ending up in a list. The resulting data could look like this:

List1 = ['Monday','Wednesday','Friday']
List2 = ['Tuesday','Friday']
List3 = ['Wednesday']

In addition, I want to validate the input so that I know that each entered day is spelled correctly with appropriate capitalization. The only valid entries are Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday.

Suggestions??? Thanks!!!

CodePudding user response：

Use askfordays() to ask the user for days (3 times is the default). It returns a list of lists.

According to your example, you can use it like this : list1, list2, list3 = askfordays()

The validate() function doesn't return anything. Its only purpose is to raise a ValueError Exception if input is not correct.

The validate() function is called inside a "user input" loop, that loops until input is correct.

WEEKDAYS = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]

def validate(days: list[str]) -> None:
    for day in days:
        if day not in WEEKDAYS:
            raise ValueError(f"Unknown day : {day}")

def askfordays(ntimes: int = 3) -> list[list[str]]:
    res = []
    for _ in range(ntimes):
        while True:  # loop until user input is correct
            days = input("Please enter the day(s) of the week (comma-separated) :\n")
            days = [d.strip() for d in days.split(",")]
            try:
                validate(days)
            except ValueError as e:
                print(e)
            else:
                res.append(days)
                break
    return res

CodePudding user response：

Just create a function and call it as many times as you want.

valid_days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]

def validate_entry():
    new_list = []
    print("NOTE: Seperate days with comma(,) E,g: Sunday, Monday")
    user_entry = input("Enter days(s): ").title()
    if ", " or "," in user_entry:
        for day in user_entry.split(","):
            day = day.strip()
            if day in valid_days:
                new_list.append(day)
            else:
                print(f"{day} is not a correct spelling.")
    return new_list
    
    
list1 = validate_entry()
print(list1)

list2 = validate_entry()
print(list2)

list3 = validate_entry()
print(list3)