Control Flow If Statements
Comparison Operators
Python’s comparison operators are used to compare values and return a Boolean result (True or False).
x = 10
y = 5
print(x == y) # False: Equal to
print(x != y) # True: Not equal to
print(x > y) # True: Greater than
print(x < y) # False: Less than
print(x >= y) # True: Greater than or equal to
print(x <= y) # False: Less than or equal to
These operators can be chained for more complex comparisons:
x = 5
y = 10
z = 5
print(x < y and y > z) # True - uses `and` which is a boolean operator which can be covered separately.
print(x == z or x > y) # True - uses `or`, another boolean operator.
Boolean Operators - This needs a separate note covering and, or, and not.
Chaining Comparisons - Further details on efficiently chaining multiple comparisons (e.g., 1 < x < 10).
Important Note: Comparison operators have precedence over boolean operators. Parentheses may be required to force a different order of evaluation for complex boolean expressions.
Example of Precedence:
print(1 < 2 and 2 < 3) #True, comparison before and
print (1 < (2 and 2) < 3) #Error: Invalid operand for and, needs a boolean