Python Method Calls and Lists Slicing Quiz

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Questions and Answers

What will be the output of int(str(45))?

45 (correct)
'45'
Error
4545

Which of the following is a valid way to call the `sqrt()` function from the `math` module?

math.squareRoot(x)
squareRoot(math,x)
math.sqrt(x) (correct)
math.square_root(x)

What does the expression 'cad' in 'abracadabra' evaluate to?

'cadabra'
True (correct)
False
'abra'

Which of the following correctly demonstrates slicing from index 2 to 3 in a string s?

s[2:3] (C) Signup and view all the answers

What does the statement 'string is immutable' mean in Python?

Strings cannot be modified once they are created. (C) Signup and view all the answers

What is the purpose of the 'help()' function in Python?

To print the documentation of a module (D) Signup and view all the answers

Which of the following characters is used to represent a new line in Python?

\n (A) Signup and view all the answers

What does the '==' operator represent in Python?

Equality (C) Signup and view all the answers

Which symbol is used for exponentiation in Python?

** (C) Signup and view all the answers

What is a valid consideration when naming variables in Python?

Variable names are not case-sensitive (D) Signup and view all the answers

What is the correct order of operations for evaluating expressions in Python?

() > f(args...) > [index:index] > .attribute > ** (D) Signup and view all the answers

Which of the following is true about the general form of a method call?

The object is followed by a dot and the method name (D) Signup and view all the answers

In Python, what does the 'for char in s:' statement indicate within a for loop?

Iterating over the characters in the string variable 's' (C) Signup and view all the answers

What does the 'list.extend(['a', 'b'])' code snippet do in Python?

Extends the list by adding elements from another list (B) Signup and view all the answers

What does it mean when we say that lists are mutable in Python?

Changes can be made to the contents of a list after it has been created (D) Signup and view all the answers

What happens when two variables in Python refer to the same list object?

They become aliases and modifications to one are reflected in the other (A) Signup and view all the answers

Which method adds a value or string to the end of a list in Python?

'list.append('value')' (D) Signup and view all the answers

What is the key difference between the 'for' loop and the 'while' loop described in the text?

The 'for' loop evaluates every character in the string, while the 'while' loop stops as soon as a vowel is found. (B) Signup and view all the answers

What will be printed when the function secret('123') is executed?

123 (D) Signup and view all the answers

What happens when the function y() is called after x() following the given code snippets?

num remains 5 globally. (C) Signup and view all the answers

Which of the following statements regarding global variables is TRUE?

Values of global variables can't be modified inside functions without declaration. (A) Signup and view all the answers

What type of data must keys of a dictionary be?

Any immutable data type such as strings, numbers, or tuples (C) Signup and view all the answers

Which statement best describes how the 'while' loop operates?

'while' loop is an if statement that repeats its block of code until the condition evaluates to True. (C) Signup and view all the answers

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Study Notes

Python Basics

The output of int(str(45)) is an integer, which is 45.

Math Module

The sqrt() function from the math module can be called by import math and then math.sqrt().

String Operations

The expression 'cad' in 'abracadabra' evaluates to True, indicating that the substring 'cad' is present in the string 'abracadabra'.
Slicing from index 2 to 3 in a string s can be done using s[2:3].
A string is immutable in Python, meaning its contents cannot be changed after creation.

Functions and Variables

The help() function in Python displays the documentation of a module, function, or variable.
A valid consideration when naming variables in Python is that they cannot start with a digit.
The correct order of operations for evaluating expressions in Python is PEMDAS (Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction).

Operators and Symbols

The == operator represents equality comparison in Python.
The symbol ** is used for exponentiation in Python.
The \n character is used to represent a new line in Python.

Lists and Dictionaries

The list.extend(['a', 'b']) code snippet adds the elements 'a' and 'b' to the end of a list.
Lists are mutable in Python, meaning their contents can be changed after creation.
When two variables in Python refer to the same list object, changing one variable affects the other.
The append() method adds a value or string to the end of a list in Python.

Loops and Control Structures

The for char in s: statement indicates a loop that iterates over each character in the string s.
The key difference between the for loop and the while loop is that a for loop iterates over a sequence, while a while loop continues to execute until a condition is met.
The while loop operates by repeatedly executing a block of code while a condition is true.

Functions and Scope

When the function secret('123') is executed, it will print the result of the function with the argument '123'.
When the function y() is called after x() following the given code snippets, it may access and modify the same global variables as x().
A true statement regarding global variables is that they can be accessed and modified by functions.
Dictionary keys must be immutable data types, such as strings, integers, or tuples.
The while loop operates by repeatedly executing a block of code while a condition is true.