Hello! We love quizzes on programming languages. In our blog we have already posted as many as three: the first is in Python, PHP, Golang, DevOps, the second is completely in Go, the third is only in PHP. Today's quiz is dedicated exclusively to Python.

We invite you to warm up in honor of the end of another summer week and on the eve of PyCon Russia 2018 . (By the way, who is going? We will be there).

Under the cut - seven questions, tips from a friend, Chapaev, excerpts from ABBA ( what? Yes! ) And cool merch.

UPD: We've finished accepting answers. Thanks to everyone who participated! Answers to questions - inside the text, and the winners and runners-up under the spoiler.

Prizes

Prizes are distributed among the top ten. To the first person who correctly answers all the questions of the Python quiz, we’ll send an advanced Avito-merch collection: a sweatshirt, socks and holivary bones - we can guess what backend language and frontend framework your new project will be written. We will award the second participant who has coped with the tasks with holivarny bones, socks and a T-shirt. The third will get the same set, but without a t-shirt / sweatshirt. Among the remaining seven participants we will play a thermal bottle with a carbine, which can be taken even on a hike, even on a hackathon.

Questions

* In all cases we are talking about Python 3.

Question 1

What is the result of the variable t :

 >>> t = (1, 2, [30,40]) >>> t[2] += [50, 60] 

Variants of answers:

• TypeError will TypeError , t will be (1, 2, [30, 40, 50, 60]) ,
• TypeError will TypeError , t will be (1, 2, [30, 40]) ,
• (1, 2, [30, 40, 50, 60]) ,
• (1, 2, [30, 40]) .

Question 2

Do you have the following structure of modules:

 foo_app/ snatch/ qwerty.py bar_app/ snatch/ mamamia.py 

How to make it so that in the code you can import these modules in this way:

 from snatch import qwerty, mamamia 

Variants of answers:

• before running the script, execute export PYTHONPATH=foo_pp:br_pp ,
• at the top of the script add:
  

   import sys sys.path.extend(['foo_app', 'bar_app']) 

• both options above are working,
• so it can not be done.

Question 3

There is a script:

 class A: def get_some(self): super().get_some() class B: def get_some(self): print('Some') class C(A, B): def get_some(self): super().get_some() c = C() c.get_some() 

What will be the output?

Variants of answers:

• AttributeError: 'C' object has no attribute 'get_some' ,
• AttributeError: 'super' object has no attribute 'get_some' ,
• Some
• emptiness (without Chapaev).

Question 4

What will be displayed when running such a code:

 class A: def foo(self): print('foo A') class B: def foo(self): print('foo B') class C(A, B): def foo(self): super().foo() class D(B, A): def foo(self): super().foo() class E(C, D): pass e = E() e.foo() 

Answer Options

• foo A ,
• foo B ,
• TypeError: Cannot create a consistent method resolution order (MRO) for bases A, B

Question 5

Imagine you have a module foo.py:

 def bar(): print(', !') 

And you run another script:

 import importlib import foo from foo import bar input(',  ') importlib.reload(foo) bar() 

While he is waiting for input, you are changing the foo.py module:

 def bar(): print(', !') 

Then you press "input" in foo.py, so that it continues to work and see ...

Variants of answers:

• ModuleReloadedException: method bar() was reloaded ,
• , ! ,
• , ! ,
• emptiness (and again there is no Chapaev).

Question 6

What will be displayed when running such a code:

 class A: def __init__(self): print('__init__ A', end=' ') class B: def __init__(self): print('__init__ B', end=' ') class C(A, B): pass c = C() 

Variants of answers:

• __init__ A __init__ B
• __init__ B __init__ A
• __init__ A
• __init__ B

Question 7

What will be in the output after executing the following code?

 def not_(value): return not value result = not_(0), all(any([not_(x) for x in range(b)]) for b in range(10)) print(result) 

Variants of answers:

• (True, True) ,
• (True, False) ,
• ValueError: need more than 2 values to unpack ,

•  def not_(value): return value ^ SyntaxError: invalid syntax 

  
  

Summarizing

Answers to questions will post an update to the post on Wednesday, July 25th. If you decide - put the answers under the spoiler to make it more interesting for other participants to solve the questions.
And (!) Do not forget to check Habr's personal after quiz ends.