Making Python simple for you, by exploring the fundamentals. Tips and explanations to become code-literate in this AI age. Building @PythonResources
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🚨 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:
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Coding Computing Coach retweeted
Answer: 0 2 4 (on separate lines)
Solution: In this for-loop, the iteration happens over
range(3)
which is simply a sequence from 0 to 3 (excluding 3)
ie, 0, 1, and 2.
So, i gets the values 0, 1, and 2 in the 3 iterations.
In each iteration, (i*2) gets printed
When i=0,
+
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Answer: ** is python exponentiation operator. Mathematically, this is simply the "power" or "raised to".'
2 ** -1
is 2 raised to the power (-1),
ie, 1/2 which is 0.5
Coding Computing Coach retweeted
What will be the output of the following Python code?
x = "7"
print(x * 2 == 77)
27%True
42%False
7%77
24%Error
1,240 votes • Final results Coding Computing Coach retweeted
Answer: [5, 5, 5]
Solution: The value of x is [5].
Observe that it is a list with a single item, 5.
Now, what is x * 3?
How do you multiply a list with a number?
The answer is, python repeats the list.
So,
[5] * 3
is the items in the list [5], repeated 3 times.
+
Coding Computing Coach retweeted
Answer: True
Solution: {1, 2} and {2, 1} are sets.
In sets, the order of the elements doesn't matter.
A set is like a bag with fruits, shuffled. There is no "first" or "second". The only meaningful question is,
"Is this item in the bag or not?"
{1, 2} has two items: 1, 2
+
Coding Computing Coach retweeted
Python Quiz: What is the Output?
print({1, 2} == {2, 1})
45%True
38%False
12%Error
5%None
624 votes • Final results Coding Computing Coach retweeted
Answer: 3
Solution: The // symbol stands for "floor division".
How is that different from the usual / division?
/ gives you an exact division as a float.
// gives the quotient rounded down.
Eg. 10 / 3 would be 3.333
10 // 3 is that rounded down to the lower int, ie, 3.
Coding Computing Coach retweeted
Answer: break
Solution: When python encounters the break keyword, it exits the currently running loop.
The break statement works for both while and for loops.
Coding Computing Coach retweeted
You want to exit a for loop; which statement do you use?
2%continue
81%break
2%yield
15%return
106 votes • Final results Coding Computing Coach retweeted
Answer: 0 2 4 (on separate lines)
Solution: The for-loop lets you run the same code multiple times with different values.
Let's start by understanding
range(3)
this produces a sequence of numbers: 0, 1, and 2.
In each iteration of the for-loop,
+
Coding Computing Coach retweeted
Only 1% of coders get this right on the first try!
What's your answer?
Coding Computing Coach retweeted
Answer: B
Solution: x and y are sets.
What does the `-` do on sets?
It computes the "set difference".
The diagram makes it clear (credit in description):
The shaded region is the part of A which is not in B.
That is the set difference.
+
ALT https://mathmonks.com/sets/set-operations#Difference
Coding Computing Coach retweeted
Answer: A
Solution: a and b are sets.
The code computes
a ^ b
What is this operator ^?
The operator's action is called Symmetric Difference.
The diagram shows it the symmetric difference of A and B as shaded:
+
ALT Source: https://math.stackexchange.com/a/2948656
Coding Computing Coach retweeted
Answer: A. HelloWorld
Solution: "Hello" + "World"
Here is an addition of two strings.
As we know, strings are sequences of characters.
How do you add two of these?
The answer is that the + operator does different things for different types.
Numbers get summed up. But,
+
