Python Basics Quiz

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Questions and Answers

What is the result of comparing 'Amir' > 'Michal'?

True

False (correct)

Undefined

None of the above

'cat' > 'bat' evaluates to False.

False

How does Python compare strings?

Python compares strings in lexicographical (alphabetical) order.

If strings S and T are compared, and S < T, then there exists some _____ where S and T differ.

i Signup and view all the answers

Match the following operations or principles with their descriptions:

Lexicographical comparison = Alphabetical order of strings Iteration = Repeating a process to achieve a result Arithmetic series = Sum of a sequence of numbers Python = A programming language Signup and view all the answers

Which statement is true regarding 'cat' > 'cut' in Python?

False Signup and view all the answers

Iterations refer only to loops in programming.

False Signup and view all the answers

What was young Carl Friedrich Gauss known for in the context of addition?

He figured out how to efficiently compute the sum of an arithmetic series. Signup and view all the answers

What are the Boolean values in Python?

True and False Signup and view all the answers

In Python, the logical operator 'and' returns True if both operands are False.

False Signup and view all the answers

What is the equivalent of 'not (a or b)' according to De Morgan's rules?

(not a) and (not b) Signup and view all the answers

The standard logical operators in Python include 'and', 'or', and ______.

not Signup and view all the answers

Which of the following operators is used for comparison in Python?

!= Signup and view all the answers

The statement 'not b' will return True if b is True.

False Signup and view all the answers

Match the Boolean expressions with their results:

True and False = False False or True = True not True = False True or False = True Signup and view all the answers

Python's True and False are ______ while in most other programming languages they are not.

capitalized Signup and view all the answers

What is the result of summing the integers from 1 to $n$ using Gauss' method?

$\frac{n(n + 1)}{2}$ Signup and view all the answers

The method based on Gauss' observation requires the same number of addition operations as the iterative summation method.

False Signup and view all the answers

How many arithmetic operations does Gauss' method require to calculate the sum of the first $n$ integers?

3 Signup and view all the answers

In Python, a list is created by enclosing its elements in __________.

square brackets Signup and view all the answers

Match the following Python data types with their descriptions:

str = Sequence of characters range = Sequence of integers list = Sequence of elements of any type Signup and view all the answers

Which statement correctly describes the efficiency of the two methods for computing the sum of integers from 1 to $n$?

Gauss' method is significantly faster than the iterative method. Signup and view all the answers

In Python, elements of a list can be accessed via their position or index.

True Signup and view all the answers

What is the output of 'sum(range(1, 101))' in Python?

5050 Signup and view all the answers

What will be the result of executing `num_list[1:5]`?

[12, 13, 14, 15] Signup and view all the answers

The expression `num_list[8:3:-2]` produces an empty list.

True Signup and view all the answers

What does `num_list[::-1]` do?

It reverses the list. Signup and view all the answers

The slice `num_list[::2]` retrieves every ______ element from the list.

second Signup and view all the answers

What will the output be if the code `print(product)` is executed after initializing `product = 1` and iterating over the list L = [1,2,3,4]?

12 Signup and view all the answers

Slicing a list changes the original list.

False Signup and view all the answers

Match the following slicing formats with their descriptions:

num_list[10::-1] = Reverses the entire list starting from index 10 num_list[0:10:2] = Retrieves every second element from index 0 to 9 'Rye Bread'[::-1] = Reverses the string num_list[-1:-11:-1] = Reverses the list starting from the last element Signup and view all the answers

What is the output of `len('Rye Bread')`?

9 Signup and view all the answers

What is the output of the list comprehension [n**2 for n in range(1,10) if n%2 == 1]?

[1, 9, 25, 49, 81] Signup and view all the answers

In Python, list comprehension can modify the original list without creating a new one.

False Signup and view all the answers

What Python data structure is used to hold a collection of elements?

list Signup and view all the answers

Using list comprehension, the expression [st for st in staff if st == 'm'] creates a list of all staff members that start with the letter ______.

m Signup and view all the answers

Match the following programming operations with their descriptions:

for loops = Repeat a set of operations over a collection list comprehension = Create lists succinctly based on existing collections if-elif-else = Split program flow into paths based on conditions slicing = Get a subset of a list using index range Signup and view all the answers

What does the boolean expression 'n % 2 == 0' check for?

Whether n is even Signup and view all the answers

List indices in Python start from 1.

False Signup and view all the answers

What is the main advantage of using list comprehension?

Conciseness and readability Signup and view all the answers

Study Notes

Boolean Type

Boolean values are either True or False.
Python's True and False are capitalized, unlike other languages.
Boolean values are used for logical operations.
Logical operators: and, or, not are used to create complex Boolean expressions.
not(a or b) is equivalent to (not a) and (not b) (De Morgan's Rule).

Comparing Strings

Strings are compared lexicographically (alphabetically).
Assumption: the set of alphabet (characters) is totally ordered.
S = s0 s1 ... sn-1 and T = t0 t1 ... tm-1
S < T if and only if: (1) si = ti for 0 <= j < i and (2) either si < ti or i = n < m.

Loops and Iteration

Iteration: Repeating a process to reach a desired goal.
Example: Calculate sum of integers from 1 to 10.
while loop: Repeats a set of operations until a specific condition is false.
for loop: Iterates over each element in a sequence (list, string, range).

Type `list`

list is a sequence (ordered collection) of elements of any type.
Created using square brackets [].
Example: my_list = [2, 3005, 50, 746, 11111]

Lists are Indexable

Elements can be accessed by their position or index using [].
Indexes start at 0.
Example: list[0] is the first element.

Lists and Strings – Summary

Both list and str are sequences (ordered collections) in Python.
Both can be indexed, sliced, and iterated over.
Lists are mutable and can be modified after creation.
Strings are immutable and cannot be modified after creation.

Ways to Generate Lists

Explicit: [1, 11, 21, 31]
Via loop: L = []
Slicing an existing list: L = L[0:4]
Direct casting of other sequences: L = list(range(1, 40, 10))
List comprehension: L = [i for i in range(40) if i%10==1].

List Comprehension

Syntactically concise way to generate new lists.
Syntax: [expression for variable in collection if condition].
Example: [n**2 for n in range(1,10) if n%2 == 1].

Lecture 2 - Highlights

Use conditional statements (if-elif-else) to control program flow.
Document your code using #.
Boolean values (True, False) are used in logical operations (and, or, not).
Comparison operators (==, !=, <, >, =) evaluate to Boolean values.
Strings are compared lexicographically.
Loops (while, for) are used to repeat operations.
Lists are versatile data structures that support indexing, iteration, slicing, and len() functions.

Studying That Suits You

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Description

Test your knowledge on fundamental Python concepts including Boolean types, string comparisons, and loops. This quiz covers basic operations and data structures in the Python programming language.

Python Basics Quiz

Podcast Beta

Questions and Answers

What is the result of comparing 'Amir' > 'Michal'?

'cat' > 'bat' evaluates to False.

How does Python compare strings?

If strings S and T are compared, and S < T, then there exists some _____ where S and T differ.

Match the following operations or principles with their descriptions:

Which statement is true regarding 'cat' > 'cut' in Python?

Iterations refer only to loops in programming.

What was young Carl Friedrich Gauss known for in the context of addition?

What are the Boolean values in Python?

In Python, the logical operator 'and' returns True if both operands are False.

What is the equivalent of 'not (a or b)' according to De Morgan's rules?

The standard logical operators in Python include 'and', 'or', and ______.

Which of the following operators is used for comparison in Python?

The statement 'not b' will return True if b is True.

Match the Boolean expressions with their results:

Python's True and False are ______ while in most other programming languages they are not.

What is the result of summing the integers from 1 to $n$ using Gauss' method?

The method based on Gauss' observation requires the same number of addition operations as the iterative summation method.

How many arithmetic operations does Gauss' method require to calculate the sum of the first $n$ integers?

In Python, a list is created by enclosing its elements in __________.

Match the following Python data types with their descriptions:

Which statement correctly describes the efficiency of the two methods for computing the sum of integers from 1 to $n$?

In Python, elements of a list can be accessed via their position or index.

What is the output of 'sum(range(1, 101))' in Python?

What will be the result of executing num_list[1:5]?

The expression num_list[8:3:-2] produces an empty list.

What does num_list[::-1] do?

The slice num_list[::2] retrieves every ______ element from the list.

What will the output be if the code print(product) is executed after initializing product = 1 and iterating over the list L = [1,2,3,4]?

Slicing a list changes the original list.

Match the following slicing formats with their descriptions:

What is the output of len('Rye Bread')?

What is the output of the list comprehension [n**2 for n in range(1,10) if n%2 == 1]?

In Python, list comprehension can modify the original list without creating a new one.

What Python data structure is used to hold a collection of elements?

Using list comprehension, the expression [st for st in staff if st == 'm'] creates a list of all staff members that start with the letter ______.

Match the following programming operations with their descriptions:

What does the boolean expression 'n % 2 == 0' check for?

List indices in Python start from 1.

What is the main advantage of using list comprehension?

Study Notes

Boolean Type

Comparing Strings

Loops and Iteration

Type list

Lists are Indexable

Lists and Strings – Summary

Ways to Generate Lists

List Comprehension

Lecture 2 - Highlights

Studying That Suits You

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What will be the result of executing `num_list[1:5]`?

The expression `num_list[8:3:-2]` produces an empty list.

What does `num_list[::-1]` do?

The slice `num_list[::2]` retrieves every ______ element from the list.

What will the output be if the code `print(product)` is executed after initializing `product = 1` and iterating over the list L = [1,2,3,4]?

What is the output of `len('Rye Bread')`?

Type `list`