26.py

#Membership operators = used to test whether a value or variable is found in a sequence
#(string, list, tuple, set, or dictionary)
#1. in
#2. not in


#EXAMPLE 1

word = "SHAYEN"

letter = input("Guess a letter in the secret word: ")

if letter in word:
   print(f"There is a {letter}")
else:
   print(f"{letter} was not found")


#EXAMPLE 2

students = {"Shayen", "Thomas", "Sherin"}

student = input("Enter the name of a student: ")

if student in students:
   print(f"{student} is in this class")
else:
   print(f"{student} is NOT in this class")


#EXAMPLE 3

grades = {
   "Shayen": 'A',
   "Thomas": 'B',
   "Sherin": 'C',
   "Antony": 'D'
}

student = input("Enter the name of a student: ")

if student in grades:
   print(f"{student}'s grade is {grades[student]}.")
else:
   print(f"{student} is not in the dictionary")


#EXAMPLE 4

email = "shayen@gmail.com"

if "@" in email and "." in email:
    print("Valid email")
else:
    print("Invalid email")