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The >= (greater than or equal to) operator is a relational comparison operator that evaluates whether the left operand is strictly greater than or equivalent in value to the right operand. It yields a boolean result, returning True if the condition is satisfied and False otherwise. 
left_operand >= right_operand

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Underlying Implementation

When the Python interpreter evaluates the >= operator, it delegates the operation to the object’s data model by invoking the __ge__() special (dunder) method on the left operand. 

# The standard syntax
a >= b


# The internal method resolution (standard order)
a.__ge__(b)
In the standard resolution order, if a.__ge__(b) returns the NotImplemented singleton, Python falls back to the right operand’s reflected method, b.__le__(a). If both methods return NotImplemented, Python raises a TypeError. However, Python enforces a strict subclass priority rule for rich comparisons. If the right operand is an instance of a strict subclass of the left operand’s type, Python swaps this resolution order. It prioritizes the right operand’s reflected method (b.__le__(a)) before attempting the left operand’s __ge__() method. If the prioritized b.__le__(a) method returns NotImplemented, Python then attempts a.__ge__(b). If both return NotImplemented, it immediately raises a TypeError.

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Type-Specific Evaluation Mechanics

The behavior of the >= operator depends strictly on the types of the operands being compared:
  • Numeric Types (int, float, Decimal, Fraction): Evaluates the mathematical magnitude. Python automatically handles type coercion for cross-type numeric comparisons (e.g., comparing an int to a float), except for complex numbers, which do not support ordering.
  • Strings (str): Performs a strict lexicographical comparison based on the Unicode code point values of the characters, evaluated sequentially from left to right using the ord() function.
  • Sequences (list, tuple): Evaluates lexicographically by comparing elements at corresponding indices sequentially. The comparison result of the first unequal pair of elements determines the overall result of the sequence comparison. If no unequal elements are found, a >= b evaluates to True if both sequences are identical in length and elements, or if the left sequence contains more items than the right sequence.
  • Sets (set, frozenset): Functions as a superset test. a >= b evaluates to True if and only if every element present in b is also present in a.

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Operator Chaining

Python allows the >= operator to be chained with other relational operators to form compound boolean expressions. 
a >= b >= c
This chaining utilizes short-circuit evaluation. While conceptually similar to (a >= b) and (b >= c), there is a critical mechanical difference: in a chained comparison, the middle operand (b) is evaluated exactly once. If the first comparison (a >= b) evaluates to False, the expression short-circuits and the remainder of the chain is skipped. If it evaluates to True, the next comparison (b >= c) is executed without re-evaluating b. This guarantees that if b is an expression with side effects (such as a function call), those side effects are only triggered a single time.
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