Coding Computing Coach @CodingComputing
Making Python simple for you, by exploring the fundamentals. Tips and explanations to become code-literate in this AI age. Building @PythonResources codingcomputing.github.io Maximize your coding skills 👇 Joined May 2019-
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@PythonPr Answer: D Solution: The python does different things for different kinds of operators. a is a string, '9'. b is an int, 4. In python, string-int multiplication is defined as repepetition of the string, int number of times. So, '9' * 4 gives 4 repetetions of 9, ie, "9999".
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@PythonDvz Answer: A. list Solution: The square brackets at the start and end indicate that the object is a list. A list is a collection that can hold objects of any other data type, like int, str, float, etc.
@PythonPr Answer: 125 Solution: a looks like a number, but it's not! The quotes around it make it a string - a sequence of characters. But, int(a) converts it from string to an integer, so b is now the int 123. You can do arithmetic operations on it. Printing b+2 prints 123+2, ie, 125.
@PythonPr Answer: A Solution: x.insert(2, 0) modifies x. It inserts the item 0 at index 2. What happens to the current items at index 2 and beyond in x? They get shifted to the right. So, x gets modified to [5, 6, 0, 7, 8] that's what is printed, hence Option A is correct.
@PythonDvz Strings in python are immutable. That means, once a string object is created, it cannot be modified. Here we are creating the string and trying to make a change to it. But that gives an error because strings aren't mutable.
@PythonPr Answer: 17 Solution: x is 2 and y is 3. z is assigned the expression x**y + y**x ie 3**2 + 2**3 There are 2 operations here: ** that denotes exponentiation, and + for addition. ** has higher precedence, so it's performed first. 3**2 is 9 2**3 is 8 9+8 is 17, that's printed.
@driscollis 1 and 2 on the regular!
@PythonDvz NameError. We are trying to access x, but we have never defined what x is. Since python doesn't know what x is, it puts up an error. Specifically a NameError.
@kmcnam1 Not surprising to see people saying this. Especially when there are AI-integrated fridges.
@RealBenjizo Answer: B Solution: The function is the tricky part, let's zoom in on that. The function call passes the argument d to modify_dict. But modify_dict doesn't "modify" d. Rather, it gives the name d to something else (dictionary with grandma). And, that changed d is just a +
Coding Computing Coach retweeted
Python Question What is the output of this code and why?
@RealBenjizo local variable. And then we return d. But that returned value is never saved. So, the d in the main program remains unchanged.
@RealBenjizo Answer: a. Error Solution: x is a tuple. Tuples are immutable, ie, you cannot change it after it is created. In the function call to func, the argument is the tuple. However, func tries to modify the index 0 value of this tuple. This gives error because tuples are immutable.
Coding Computing Coach retweeted
Python Question: Let's see who can explan this better. What is the output of this code?
@akshaymarch7 Writing code with correct syntax is not the bottleneck. The understanding the requirements and formulating a sound plan is more important than ever.
Indexing starts from 0 for the leftmost item. The more you increase, the rightwards you go. BUT there is a negative indexing feature. The negative index starts from -1 from the rightmost item. The more you decrease, the leftwards you go.
@PythonPr Answer: 3 Solution: As we know, indexing starts from 0, from the leftmost item. However, python provides this feature of negative index, which makes it easy to obtain items from the right. a[-1] refers to the last (rightmost) item of the list a. Thus, here it is 3.
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