Coding Computing Coach

🚨 Python Testing Series 🚨 Employ testing to gamify your coding. Learn how to test code using pytest. Build a Cash Dispenser project in Test Driven style. Ongoing series of posts, see README at: github.com/CodingComputin…

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.

Find the Output in Python

Tuples are the immutable cousins of lists.

@PythonPr False. `a` is a list. tuple(a) produces a tuple from `a`. So, it has the same items, in the same order. But within a tuple as the container. As the containers don't match (list vs tuple), the comparison gives False.

Python Quiz: What is The Output? 🐍🐍🐍

In python, * doesn't just multiply...

@PythonDvz Answer: C a is a str & b is an int. It seems impossible to multiply them using the * operator. But the * operator does different things for different operand types. For str and int, the * operator repeats the str, int times. '5' * 3 repeats the string thrice, ie, "555"

Comment your ANSWER 🫵 #python #programmer #coding

@PythonDvz Answer: Indexing starts from 0. So, x[1] refers to the 2nd item from the left, and that's the string '2'. Similarly x[2] refers to the 3rd item from the left, and that's the string '3'. If we add those two, we are adding strings, which joins them. That gives 23 to print.

🤔🚀 Comment your answer 👇👍⚡ #python #programming #codinglife #developers #pythonquiz #codingquiz #codingchallenge #100DaysOfCode

@PythonPr Answer: 52 x is 5, y is 10. In x*y+2, the multiplication happens first (PEMDAS rule) 5*10+2 simplifies to 50+2 that is 52, which gets printed.

Python Quiz: What is The Output ?

@clcoding Answer: 5 Solution: x is a list [1, 2, 3]. Now we run print(x.pop(1) + x[1]) The expression inside print now evaluates as x.pop(1) this actually removes the item at index 1 in x (thus modifying x), AND returns it here. Thus x.pop(1) evaluates to 2, and modifies x to [1, 3] +

What will be the output of the following Python code? x = [1,2,3] print(x.pop(1) + x[1])

@clcoding At this time, x[1] is 3. Thus, the value inside print simplifies to 2 (from the pop operation) + 3 (x[1] after the pop) which works out to be 5. And that's what gets printed.

@RealBenjizo Answer: a. tuple Solution: In Python, a comma makes a tuple. The parentheses are actually the optional part. So, what many people assume is "python magic" like a, b = b, a is actually just a tuple assignment. The comma between the list [1, 2] and the tuple (1,2) makes a tuple

Python Question: Be careful; this one is tricky. 😅 What is the output of this code and why?

@RealBenjizo return = "I am done. Clean up, take this value and go back." yield = "I am done for the moment, I can take back a value. But instead of cleaning everything up, let me save my work to take it from that point when I come back to work on the next value."

Pythonistas, where are you? Explain the difference between return and yield in Python functions as if I am 10.

@CodingComputing @RealBenjizo I got it wrong, too. It turns out that boolean "not" has a lower precedence than comparison operators, so this expression gets evaluated as not (None != False) => not True => False