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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Python Quiz: What is the Output?
a = 5
b = 2
c = a + b * 3
print (c)
76%11
3%15
14%21
7%17
422 votes • Final resultsPython Quiz: What is the Output?
x = [8, 3, 5]
print(sorted(x))
82%[3, 5, 8]
8%[8, 3, 5]
3%[5, 3, 8]
7%[3, 8, 5]
441 votes • Final results 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 resultsPython Quiz: What is the Output?
print({1, 2} == {2, 1})
45%True
38%False
12%Error
5%None
624 votes • Final resultsAnswer: 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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Python Quiz: What is the Output?
x = " 7 "
print ( x*2 )
36%14
13%49
46%77
5%72
1,152 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 resultsYou 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,
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Coding Computing Coach retweeted
Only 1% of coders get this right on the first try!
What's your answer?
the variable i will take on these 3 values one-by-one.
So, for the first iteration, the value of i is 0.
The body of the loop is then executed, ie,
print(i*2)
as the current value of i is 0, i*2 is also 0, and that gets printed.
Next i becomes 1.
print(i*2)
prints
2
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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