Explaining Python's Conditional Statements in Detail

There are three main forms of conditional statements: the if statement, the if... . else statements and if... .elif... .else statements

statement

Commonly used comparison operators in conditional statements: <, <=, >, >=, ==, ! =

#Judge if you've won the lottery, winning number: 654321
number = int(input("Please enter your 6-digit lottery number: "))
if numeber == 654321:
    print(number,"You have won the grand prize of this issue, please come and claim your prize!!!")
if number != 654321:
    print(number,"Unfortunately, you did not win!")
 
 
# Requires the user to enter a number between 0 and 9, and prompts the user to re-enter if an illegal character is entered.
number = [0,9]
if ord(input("Please enter a number:") not in range(48,58):
    print("You entered incorrectly, please re-enter!!!")

... . else statements

# Determine if the username and password are entered correctly when logging into a website
 
myuser = "Quiet as the morning light."
mypassword = "666666"
user = input("User name:")
password = input("Login password:")
if user == myuser and password == mypassword:
    print("Congratulations, login successful!")
else:
    print("User name or password incorrect, login failed!")

... .elif... .else statements

# Determine the age class of the user
year = int(input("Please enter your year of birth:"))
if year >= 2010:
    print("You belong to the post 10, with a great future ahead of you!")
elif 2010 >year >=2000:
    print("You belong to the 00's, Willow!")
elif 2000 > year >= 1990:
    print("You belong in the 90s."，chopping waves and chopping rough seas (idiom); fig. hardships of the journey！)
elif 1990> year >= 1980:
    print("You belong to the 80s and have a long way to go!")
elif 1980> year >=1970:
    print("You belong to the 70s, the oldest of the old!")

Nesting of statements

# Determine the age class of the user
year = int(input("Please enter your year of birth:"))
if year >= 2010:
    print("You belong to the post 10, with a great future ahead of you!")
elif 2010 >year >=2000:
    print("You belong to the 00's, Willow!")
elif 2000 > year >= 1990:
    print("You belong in the 90s."，chopping waves and chopping rough seas (idiom); fig. hardships of the journey！)
elif 1990> year >= 1980:
    print("You belong to the 80s and have a long way to go!")
elif 1980> year >=1970:
    print("You belong to the 70s, the oldest of the old!")

summarize

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