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Questions and Answers
What is the output of print(2 ** 3)?
What is the output of print(2 ** 3)?
- 8 (correct)
- 6
- 2
- 3
How do you reverse a list in Python?
How do you reverse a list in Python?
- `list.reverse()` (correct)
- `reversed(list)`
- `list[::-1]` (correct)
- `list.sort()`
How can you check if a number is even in Python?
How can you check if a number is even in Python?
- By using the expression `number % 2 == 0` (correct)
- By using the function `is_even(number)`
- By using the expression `number / 2 == 1`
- By checking if `number` is less than 0
What is the difference between list.append() and list.extend()?
What is the difference between list.append() and list.extend()?
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How do you remove duplicates from a list in Python?
How do you remove duplicates from a list in Python?
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How can you convert a string to lowercase in Python?
How can you convert a string to lowercase in Python?
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How do you check if a string contains only digits?
How do you check if a string contains only digits?
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What is the output of print('Python'[1:4])?
What is the output of print('Python'[1:4])?
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How can you create a dictionary with keys from a list and all values set to zero?
How can you create a dictionary with keys from a list and all values set to zero?
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How do you find the length of a list in Python?
How do you find the length of a list in Python?
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Study Notes
Python Basics
print(2 ** 3)outputs8, as it uses the exponentiation operator (**).list.reverse()orlist[::-1]are methods to reverse a list in Python.
Number and String Operations
- To check if a number is even, use
number % 2 == 0. string.lower()converts a string to lowercase.- Use
string.isdigit()to check if a string contains only digits.
Working with Lists
list.append(value)adds a single value to the end of a list, whilelist.extend(iterable)adds elements from an iterable.- To remove duplicates from a list, convert it to a set using
set(list)and back to a list. print('Python'[1:4])outputs'yth', as it slices the string from index 1 to 3.
Dictionaries and Lists
- Create a dictionary with keys from a list and values set to zero using
{key: 0 for key in keys_list}. - Use
len(list)to find the length of a list in Python.
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