In Python, the `all()` function is a built-in function that accepts an iterable object as a parameter and returns a boolean value. Its function is to determine whether all elements in the iterable object are true values (non-zero, non-empty, non-None, etc.). If so, it returns True; otherwise, it returns False.
The following is the syntax of the `all()` function:
all(iterable)
- `iterable`: an iterable object, which can be a list, tuple, set, etc.Here is an example of using the `all()` function to determine whether all elements in a list are greater than 0:
numbers = [1, 2, 3, 4, 5]
result = all(num > 0 for num in numbers)
print(result)
输出:
True
In the above example, we used a generator expression `num > 0 for num in numbers` to generate an iterator of boolean values. This iterator will determine whether each element in the list is greater than 0. Then, we pass this iterator as a parameter to the `all()` function, which will determine whether all elements in the iterator are true values. If so, it will return True; otherwise, it will return False. Finally, we print out the results.
The `any()` function is also a built-in function that accepts an iterable object as a parameter and returns a boolean value. Its function is to determine whether any element in the iterable object is a true value. If so, it returns True; otherwise, it returns False.
The following is the syntax of the `any()` function:
any(iterable)
- `iterable`: an iterable object, which can be a list, tuple, set, etc.
The following is an example of using the `any()` function to determine whether there are elements greater than 10 in a list:
numbers = [1, 2, 3, 4, 5]
result = any(num > 10 for num in numbers)
print(result)
输出:
False
In the above example, we used a generator expression `num > 10 for num in numbers` to generate an iterator of boolean values. This iterator will determine whether each element in the list is greater than 10. Then, we pass this iterator as a parameter to the `any()` function, which will determine whether any element in the iterator is a true value. If so, it will return True; otherwise, it will return False. Finally, we print out the results.
In summary, the `all()` function is used to determine whether all elements in the iterable object are true, while the `any()` function is used to determine whether any element in the iterable object is true. They are all very practical functions that can simplify the judgment operation of iterable objects.