Q11. What does this list comprehension do:?
### Expression: ```python [x**2 for x in range(10) if x % 2 == 0] ``` ### What It Does: This list comprehension iterates through the numbers `0` through `9`, filters for ...
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Q12. When should you use generator expressions vs. list comprehensions in Python and vice-versa?
Iterating over the generator expression or the list comprehension will do the same thing. However, the list comp will create the entire list in memory first while the gen...
Q13. Do you know what is the difference between lists and tuples? Can you give me an example for their usage?
First list are mutable while tuples are not, and second tuples can be hashed e.g. to be used as keys for dictionaries. As an example of their usage, tuples are used when ...
Q14. How do I get a list of all files (and directories) in a given directory in Python?
Following is one possible solution there can be other similar ones: ```python import os ``` for dirname,dirnames,filenames in os.walk('.'): #printpathtoallsubdirectories...
Q15. Print the index of a specific item in a list?
In Python, you find the index of an element in a list using the **`list.index()`** method: ```python technologies = ['React', 'Python', 'Docker', 'PostgreSQL'] # Finding ...
Q16. How do you iterate over a list and pull element indices at the same time?
You are looking for the enumerate function. It takes each element in a sequence (like a list) and sticks it's location right before it. For example: >>>my_list=['a','b','...
Q17. How does Python's list.sort work at a high level? Is it stable? What's the runtime?
In early pythonversions, the sort function implemented a modified version of quicksort. However, it was deemed unstable and as of 2.3 they switched to using an adaptive ...
Q18. What does the list comprehension do:?
my_list=[(x,y,z)forxinrange(1,30)foryinrange(x,30)forzin range(y,30)ifx**2+y**2==z**2] It creates a list of tuples called my_list, where the first 2 elements are the perp...
Q19. Tell me a very simple solution to print every other element of this list?
Use list slicing with a step of 2 (`[::2]`): ```python numbers = [0, 10, 20, 30, 40, 50, 60, 70, 80, 90] print(numbers[::2]) # Output: [0, 20, 40, 60, 80] ```
Q20. Given the list below remove the repetition of an element.
words=['one','one','two','three','three','two'] A bad solution would be to iterate over the list and checking for copies somehow and then remove them! A very good solutio...