Python logical operators w3schools examples

Python logical operators w3schools examples

Here are some examples of Python's logical operators from W3Schools:

And Operator (and)

The and operator is used to combine two or more conditions. It returns True if all conditions are True.

Example:

x = 10
y = 20
print(x > 5 and y > 15) # Returns: True

Or Operator (or)

The or operator is used to combine two or more conditions. It returns True if at least one condition is True.

Example:

x = 10
y = 20
print(x < 5 or y > 15) # Returns: True

Not Operator (not)

The not operator is used to negate a condition. It returns the opposite of the condition.

Example:

x = 10
print(not x > 15) # Returns: False

Logical Operators with Variables

You can also use logical operators with variables, which allows you to create more complex conditions.

Example:

x = 10
y = 20
if (x > 5 and y > 10):
print("Both conditions are true")
else:
print("At least one condition is false")

Short-Circuit Evaluation

Python uses short-circuit evaluation for logical operators. This means that the second operand is only evaluated if the first operand is True.

Example:

x = 0
y = "Hello"
if (x > 5 and y[0]):
print("Both conditions are true")
else:
print("At least one condition is false")
The code above will print: At least one condition is false
Because x is not greater than 5, so the second operand y[0] is not evaluated.

In summary, Python's logical operators (and, or, and not) are used to create complex conditions that can be applied to variables. These operators follow short-circuit evaluation rules, which means that they only evaluate the second operand if the first operand is True. This allows for efficient and flexible programming.

Python logical operators w3schools list

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Here is the list of Python logical operators from W3Schools:

Logical Operators

Python supports several logical operators, which are used to combine boolean expressions and make decisions based on conditions.

Example: a = 5; b = 7; print(a > 4 and b > 6)

Output: True

Example: a = 3; b = 8; print(a < 10 or b > 5)

Output: True

Example: x = 1; print(not x == 0)

Output: True

Example: fruits = ['apple', 'banana']; print('banana' in fruits)

Output: True

Example: fruits = ['apple', 'banana']; print('grape' not in fruits)

Output: True

Example: x = [1, 2, 3]; y = x; print(x is y)

Output: True (because x and y reference the same list)

Example: x = [1, 2, 3]; y = 5; print(x is not y)

Output: True (because x and y do not reference the same list)

Tips

I hope this helps you master Python's logical operators!