# question 5:
# The statement print("\007") outputs an ASCII escape sequence \007, which represents the Bell control character. The reason why print("\007") 
# produces a sound or visual alert is that when the string "\007" is printed, it is interpreted by the terminal or system as a signal to generate 
# an audible or visual alert, as defined by the specific implementation.

# question 6:
# The code print("abcdefg\rhijklmnop") will output "hijklmnopg"
# In Python, the '\r' character is a carriage return character, which instructs the console or terminal to move the cursor back to the beginning 
# of the current line, without advancing to the next line. This means that anything printed after the '\r' will overwrite whatever was printed earlier 
# on the same line.

# question 7:
# In this case, the carriage return character \r is treated as a regular character within the response content. It does not have the same effect as 
# in the previous example where it was used in a print statement.

# qustion 8:
# If a hacker attacks a credit card system. When the customer came to buy a can of Coke, he paid 2 knives to the store, but the display in the 
# background was "2/r500".

# question 9:
def validate(input_string):
    if "\r" in input_string:
        raise ValueError("Crime detected!")
try:
    validate("abcdefg")
    print("✅ test1 pass!")
except:
    print("❌ test1 fail!")

try:
    validate("abcdefg\rhijklmnop")
    print("❌ test2 fail!")
except ValueError as err:
    print("✅ test2 pass!")