Questions
Q: Python is always called an easy language. Will you agree with it?
Q: What are the pitfalls and problems of Python language?
Q: How does a framework differ from a library?
Q: Is it possible to use the construction True = False?
Q: When will the else part of try...except...else be executed?
Q: What is monkey patching? How to use it in Python? Example? Is it ever a good idea?
Q: How are dict and set implemented internally? What is the complexity of retrieving an item? How much memory do these structures consume?
Q: Does Python support multiple inheritance? How does it solve the diamond problem?
Q: What is MRO in Python? How does it work?
Q: Does Python have an assignment operator? How is the assignment process in Python different from C/C++?
Q: What are descriptors? Is there a difference between a descriptor and a decorator?
Q: How are arguments passed to a function in Python — by value or by reference?
Q: What tools help you find code smells in code or perform static Code analysis? What else do you know/use to make your code maintainable and readable?
Q: Whenever Python exits, why isn't all the memory de-allocated?
Q: Is it possible to have a producer thread reading from the network and a consumer thread writing to a file, really work in parallel? What about GIL?
Q: What is GIL? Why GIL still exists?
Q: What is string interning? Why it Python have it?
Q: Why Python doesn't have a tail recursion optimization? How to implement it?
Q: What is the process of compilation and linking in Python?
Q: How to distribute Python code?
Q: How to package code in Python?
Q: What is a package manager? What package managers do you know, and which one do you recommend?
Q: How to work with Python transitive dependencies?
Q: What are the wheels and eggs? What is the difference?
Q: How to package binary dependencies in Python?
Q: What is Cython? What is IronPython? What is PyPy? Why do they still exist?
Q: Explain how can you access a module written in Python from C? Vise versa?
Q: What is __pycache__? What are .pyc files?
Q: How to speed up existing Python code? How would you speed up your, say, web app?
Q: How to isolate Python code? What are virtualenvs?
Q: Is Python a functional language? Specify the requirements for code written in a functional paradigm.
Q: Identify the pitfalls/limitations of the functional code.
Q: What are .pth files?
Q: What advantages do NumPy arrays offer over (nested) Python lists?
Q: What does the PYTHONOPTIMIZE flag do?
Q: You have a memory leak in the working production application on one of your company servers. How would you start debugging it?
Code involving questions
Q: Give an example of a filter and reduce over an iterable object.
Q: Write a function that reverses the generator?
Q: You need to implement a function that should use a static variable (for example, a call counter). You cannot write any code outside the function and you do not have information about external variables (outside your function). How to do it?
Q: What methods and in what order are called when print (A() + B()) is executed?
Q: How to implement a dictionary from scratch using core Python?
Q: What's the output?
def Foo():
yield 42;
return 666
Q: What will be the output of the following code?
>>> a = [[]] * 3
>>> a[1].append(1)
>>> print(a) # [[1], [1], [1]
Q: Place the following functions below in order of their efficiency. How would you test your answer?
def f1(arr):
l1 = sorted(arr)
l2 = [i for i in l1 if i < 0.5]
return [i * i for i in l2]
def f2(arr):
l1 = [i for i in arr if i<0.5]
l2 = sorted(l1)
return [i * i for i in l2]
def f3(arr):
l1 = [i * i for i in arr]
l2 = sorted(l1)
return [i for i in l1 if i < (0.5*0.5)]
Q: Write a one-liner that will count the number of capital letters in a file. Your code should work even if the file is too big to fit in memory.
Q: What will be the output of the following code? Why? Is this inheritance?
class C:
pass
type (C())
type (C)
Q: What will be the output of the following code?
big_num_1 = 1000
big_num_2 = 1000
small_num_1 = 1
small_num_2 = 1
big_num_1 is big_num_2
small_num_1 is small_num_2
Q: How is this possible?
_MangledGlobal__mangled = 23
class MangledGlobal:
def test(self):
return __mangled
>>> MangledGlobal().test()
23
Q: What will be the output of the following code?
>>> print(_)
Q: You saw the following piece of code. What is wrong with this code? Why is it needed?
if __debug__:
assert False, ("error")
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