Questions and Answers
How can you merge two dictionaries in Python?
What is the purpose of 'self' in a class?
How do you create a list of squares of numbers from 1 to 10 in Python?
What is the output of print('abc' * 3)?
Signup and view all the answers
How can you get the current date and time in Python?
Signup and view all the answers
What is the difference between '==' and 'is' in Python?
Signup and view all the answers
How do you swap two variables in Python without using a third variable?
Signup and view all the answers
How can you remove the last element from a list in Python?
Signup and view all the answers
What is the purpose of the pass statement in Python?
Signup and view all the answers
How can you sort a list of numbers in ascending order?
Signup and view all the answers
Study Notes
Merging Dictionaries
- Use the
update()method to merge one dictionary into another, modifying the first dictionary. - The
**unpacking operator can also be used:merged_dict = {**dict1, **dict2}. - In Python 3.9 and later, the
|operator allows merging:merged_dict = dict1 | dict2.
Purpose of 'self' in a Class
- 'self' is a reference to the instance of the class, allowing access to instance variables and methods.
- It differentiates between instance attributes and local variables within methods.
Creating a List of Squares
- Use a list comprehension:
squares = [x**2 for x in range(1, 11)]to generate a list of squares from 1 to 10.
Output of print('abc' * 3)
- Output is
'abcabcabc', which repeats the string'abc'three times.
Getting Current Date and Time
- Use the
datetimemodule:from datetime import datetime; current_time = datetime.now()to retrieve the current date and time.
Difference Between '==' and 'is'
- '==' checks for value equality, determining if two variables have the same value.
- 'is' checks for identity, determining if two variables reference the same object in memory.
Swapping Two Variables
- One can swap two variables without a third variable through tuple unpacking:
a, b = b, a.
Removing the Last Element from a List
- Use the
pop()method:list.pop()removes and returns the last element of the list. Alternatively, usedel list[-1]to remove without returning.
Purpose of the pass Statement
- The
passstatement serves as a placeholder in code, allowing for syntactically correct empty blocks, such as in functions or loops that have not been implemented.
Sorting a List of Numbers
- Use the
sort()method to sort the list in place, orsorted(list)to return a new sorted list. Both methods arrange the list in ascending order by default.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
This quiz explores various methods to merge two dictionaries in Python. Test your knowledge on the syntax and different approaches available to accomplish this task successfully.
