If a value can be converted to true, the value is so-called truthy. If a value can be converted to false, the value is so-called falsy. Examples of expressions that can be converted to false are: null; NaN; 0; empty string ("" or '' or ``); undefined.

Apr 8, 2012 · Use a.any() or a.all() >>> arr or arr ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() There are more functions and statements in Python that hide bool calls, for example 2 < x < 10 is just another way of writing 2 < x and x < 10 .

Jul 17, 2017 · ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all(). has been asked a long time ago. However, I am trying to create a basic function and return a new column with df['busy'] with 1 or 0. My function looks like this,

Dec 26, 2015 · if valeur <= 0.6: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() I have read several posts about a.any() or a.all() but still can't find a way that really clearly explain how to fix the problem. I see why Python does not like what I wrote but I am not sure how to fix it.

ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all(). Workarounds: we can decide how to treat Series of boolean values - for example if should return True if all values are True: In [136]: res.all() Out[136]: False …

Aug 2, 2017 · Just in case anyone is confused by something like 'a' or 'b' returning 'a' instead of True, note that and and or are "short circuit operators", and "When used as a general value and not as a Boolean, the return value of a short-circuit operator is the last evaluated argument."

Mar 3, 2023 · >>> [[a, a]] == [a] Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() Even though the list is clearly "not equal to" the Numpy scalar, the list comparison operation will return NotImplemented rather than False , allowing ...

Python normally interprets the length of containers (like list, tuple, ...) as truth-value if it has no explicit Boolean interpretation. So if you want the Python-like check, you could do: if x.size or if not x.empty instead of if x. If your Series contains one and only one Boolean value:

May 27, 2024 · When I try to compile the piece of code below, I get this warning: warning: suggest parentheses around assignment used as truth value Why does this happen? This is a rather common idiom, I believ...

Jan 15, 2019 · >>> a = np.array([1, 3, 5]) >>> b = np.array([5, 3, 1]) >>> print(a<b) array([True, False, False]) >>> bool(a<b) ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() You have to basically "pick" how to collapse the comparisons of all of the values across all of your arrays down to a single bool.