Python 运算符深入指南：初学者到专业人士

'''
Python Addition Operator Example
'''
x = 5
y = 3
print(x + y)  # Outputs: 8

# For strings
str1 = "Hello"
str2 = "World"
print(str1 + str2)  # Outputs: HelloWorld

'''
Python Subtraction Operator Example
'''
x = 8
y = 3
print(x - y)  # Outputs: 5

'''
Python Multiplication Operator Example
'''
x = 7
y = 4
print(x * y)  # Outputs: 28

# For strings
str1 = "Hello"
print(str1 * 3)  #: HelloHelloHello

'''
Python Division Operator Example
'''
x = 20
y = 4
print(x / y)  # Outputs: 5.0

'''
Python Modulus Operator Example
'''
x = 29
y = 4
print(x % y)  # Outputs: 1

'''
Python Exponentiation Operator Example
'''
x = 3
y = 4
print(x ** y)  # Outputs: 81

'''
Python Floor Division Operator Example
'''
x = 17
y = 4
print(x // y)  # Outputs: 4

'''
Python "Equal to" Operator Example
'''
x = 5
y = 5
z = 6
print(x == y)  # Outputs: True
print(x == z)  # Outputs: False

'''
Python "Not equal to" Operator Example
'''
x = 5
y = 7
print(x != y)  # Outputs: True

'''
Python "Less than" Operator Example
'''
x = 3
y = 5
print(x < y)  # Outputs: True

'''
Python "Greater than" Operator Example
'''
x = 8
y = 5
print(x > y)  # Outputs: True

'''
Python "Less than or equal to" Operator Example
'''
x = 7
y = 7
z = 8
print(x <= y)  # Outputs: True
print(x <= z)  # Outputs: True

'''
Python "Greater than or equal to" Operator Example
'''
x = 9
y = 6
z = 9
print(x >= y)  # Outputs: True
print(x >= z)  # Outputs: True

'''
Python Logical AND Operator Example
'''
x = True
y = False
print(x and y)  # Output: False

'''
Python Logical OR Operator Example
'''
x = True
y = False
print(x or y)   # Output: True

'''
Python Logical NOT Operator Example
'''
x = True
print(not x)  # Output: False

'''
Python Bitwise AND Operator Example
'''
x = 12  # 1100 in binary
y = 10  # 1010 in binary
print(x & y)  # Output: 8 (which is 1000 in binary)

'''
Python Bitwise OR Operator Example
'''
x = 12  # 1100 in binary
y = 10  # 1010 in binary
print(x | y)  # Output: 14 (which is 1110 in binary)

'''
Python Bitwise XOR Operator Example
'''
x = 12  # 1100 in binary
y = 10  # 1010 in binary
print(x ^ y)  # Output: 6 (which is 0110 in binary)

'''
Python Bitwise NOT Operator Example
'''
x = 12  # 1100 in binary
print(~x)  # Output: -13
# Note: This is a two's complement representation.
# The binary result is 11110011, which translates to -13 in integer

'''
Python Left Shift Operator Example
'''
x = 5  # 0101 in binary
print(x << 1)  # Output: 10 (1010 binary, shifting bits one position to left)

'''
Python Right Shift Operator Example
'''
x = 5  # 0101 in binary
print(x >> 1)  # Output: 2 (0010 binary, shifting bits one position to right)

'''
Python Assign Operator Example
'''
x = 5
print(x)  # Output: 5

'''
Python Add and Assign Operator Example
'''
x = 5
x += 3
print(x)  # Output: 8

'''
Python Subtract and Assign Operator Example
'''
x = 5
x -= 3
print(x)  # Output: 2

'''
Python Multiply and Assign Operator Example
'''
x = 5
x *= 3
print(x)  # Output: 15

'''
Python Divide and Assign Operator Example
'''
x = 5
x /= 2
print(x)  # Output: 2.5

'''
Python Modulus and Assign Operator Example
'''
x = 5
x %= 3
print(x)  # Output: 2

'''
Python Floor Divide and Assign Operator Example
'''
x = 5
x //= 2
print(x)  # Output: 2

'''
Python Exponentiate and Assign Operator Example
'''
x = 5
x **= 2
print(x)  # Output: 25

'''
Python Bitwise Assignment Operators Example
'''
x = 5  # 0101 in binary
x &= 3  # 0011 in binary
print(x)  # Output: 1 (0001 in binary)

y = 5  # 0101 in binary
y |= 3  # 0011 in binary
print(y)  # Output: 7 (0111 in binary)

z = 5  # 0101 in binary
z ^= 3  # 0011 in binary
print(z)  # Output: 6 (0110 in binary)

a = 5  # 0101 in binary
a <<= 1
print(a)  # Output: 10 (1010 in binary)

b = 5  # 0101 in binary
b >>= 1
print(b)  # Output: 2 (0010 in binary)

'''
Python "in" Membership Operator Example
'''
lst1 = [1, 2, 3, 4, 5]
print(3 in lst1)  # Output: True
print(6 in lst1)  # Output: False

'''
Python "not in" Membership Operator Example
'''
lst1 = [1, 2, 3, 4, 5]
print(3 not in lst1)  # Output: False
print(6 not in lst1)  # Output: True

'''
Python "is" Identity Operator Example
'''
x = ["apple", "banana"]
y = ["apple", "banana"]
z = x
print(x is z)  # Output: True ( z is same object as x)
print(x is y)  # Output: False (same content but different objects in memory)

'''
Python "is not" Identity Operator Example
'''
x = ["apple", "banana"]
y = ["apple", "banana"]
z = x
print(x is not z)  # Output: False
print(x is not y)  # Output: True

'''
Python Walrus Operator Example
'''
input_text = "Hello"
if (n := len(input_text)) > 4:
   print(f"Input has {n} characters.")  # Output: Input has 5 characters.

'''
Python Subscription Operator Example
'''
lst2 = [1, 2, 3, 4, 5]
print(lst2[2])  # Output: 3
dict1 = {"a": 1, "b": 2}
print(dict1["a"])  # Output: 1

'''
Python Slicing Operator Example
'''
text = "Python"
print(text[1:4])  # Output: yth

'''
Python Operator Precedence: Parentheses
'''
result = (2 + 3) * 4  # Here, addition happens first, making result 20.

'''
Python Operator Precedence: Exponentiation
'''
square = 4 ** 2  # square is 16

'''
Python Operator Precedence: Unary minus
'''
negative_value = -5

'''
Python Operator Precedence: Multiplication, Division, Floor Division, and Modulus
'''
result = 5 * 4 / 2  # First multiplication, then division. result is 10.0.

'''
Python Operator Precedence: Addition and Subtraction
'''
result = 3 + 4 - 2  # First addition, then subtraction. result is 5.

'''
Python Operator Precedence: Comparison Operators
'''
is_true = 3 < 4 == 4  # is_true is True

'''
Python Operator Precedence: Boolean 'not'
'''
is_false = not True  # is_false is False

'''
Python Operator Precedence: Boolean 'and'
'''
result = True and False  # result is False

'''
Python Operator Precedence: Boolean 'or'
'''
result = True or False  # result is True

'''
Python Operator Precedence: Assignment and other operators
'''
value = 10  # Assignment example