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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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
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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
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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.
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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.
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You want to exit a for loop; which statement do you use?
2%
continue
81%
break
2%
yield
15%
return
106 votes • Final results
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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,
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Coding Computing Coach retweeted
Only 1% of coders get this right on the first try!
What's your answer?
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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.
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ALT https://mathmonks.com/sets/set-operations#Difference
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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:
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ALT Source: https://math.stackexchange.com/a/2948656
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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,
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Coding Computing Coach retweeted
Answer: 6
Solution: sum() produces the sum of the items of this list.
Here it is 3+6+9=18
len() produces the length of the list.
Here it is 3 because there are 3 items.
The // gets the floor division (division that gives integer result by ignoring the remainder)
18//3 = 6
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Coding Computing Coach retweeted
Python Quiz: What is the Output?
x = [3, 6, 9]
print(sum(x) // len(x))
7%
3
71%
6
8%
9
14%
18
420 votes • Final results
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Coding Computing Coach retweeted
Answer: A. Pn
Solution: x is a string "Python"
x[0] gets the leftmost character, 'P'.
x[-1] has a negative index.
It gets the rightmost character, 'n'.
When you sum these two, the characters get joined.
x[0]+x[-1]
is the same as
'P' + 'n'
ie, 'Pn'.
So,
Pn gets printed.
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Coding Computing Coach retweeted
Answer: B. False
Solution: This is easy to get wrong!
"10" > "2" looks like a comparison of numbers, but look carefully.
"10" and "2" are strings. They are treated as sequences of characters.
How do you compare sequences of characters?
We do that by comparing
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