How do I correctly use Or with strings in an if statement

This is a function I wrote. If I enter Wednesday as the day of the week, the program can't get to it to exe开发者_StackOverflow中文版cute the print code. What is the correct syntax for that line of code to make Wednesday work correctly?

def day(dayOfWeek):
    if dayOfWeek == ("Monday" or "Wednesday"):
        print("Poetry: 6-7:15 in Chem 131")

The expression ("Monday" or "Wednesday") in your code is always evaluated to "Monday". The operator or is a logical or that first tries if its first operand evaluates to True. If yes, it returns the first operand, otherwise it returns the second operand. Since "Monday" is "trucy", your comparison always compares with "Monday".

Use this instead:

if dayOfWeek in ("Monday", "Wednesday"):
    print("Poetry: 6-7:15 in Chem 131")

The answer given by Sven will work, and is probably the best method, but just to demonstrate how to properly use or, you have to do it like this:

if (dayOfWeek == "Monday") or (dayOfWeek == "Wednesday"):

If you want to use ==

if dayOfWeek == "Monday" or dayOfWeek == "Wednesday":
    print("Poetry: 6-7:15 in Chem 131")