Tech

Question 1

Which of the following best defines a function in programming?

1.A predefined command that performs a specific task.
2.A block of organized, reusable code used to perform a single action.
3.A variable that stores multiple values.
4.A method to define the syntax of a programming language.

Answer 1

3. To store data values.

Question 2

Which of the following best defines a function in programming?

A predefined command that performs a specific task.

A block of organized, reusable code used to perform a single action.

A variable that stores multiple values.

A method to define the syntax of a programming language.

Answer 2

2. A block of organized, reusable code used to perform a single action.

Question 3

What is a Boolean Operator ?

Answer 3

Compare two values and then returns the value TRUE (1) or FALSE (0)

Question 4

What does the Operator “ ==” means as a Boolean Operator ?

Answer 4

The operation is true if the two value are equal

Question 5

What does the Operator “ !=” means as a Boolean Operator ?

Answer 5

The operation is true if the two value are different

Question 6

What does the Operator “ >” means as a Boolean Operator ?

Answer 6

The operation is true if the value to the right of the operator is less than the one on the left

Question 7

What does the Operator “ <” means as a Boolean Operator ?

Answer 7

The operation is true if the value on the right of the operator is less than the one on the left

Question 8

What does the Operator “ >=” means as a Boolean Operator ?

Answer 8

The operation is true if the value on the right of the operator is greater than or equal to the one on the left

Question 9

What does the Operator “ <=” means as a Boolean Operator ?

Answer 9

The operation is true if the value on the right of the operator is less than or equal to the one on the left

Question 10

What is used as connector of two Boolean Operations ?

Answer 10

AND e OR

Question 11

What is an “ if-else” Statement ?

Answer 11

It’s a conditional statement that run a different sets of command depending on wether an expression is true or false.

Question 12

What is the difference between an For loop and a While loop ?

Answer 12

in “for loop” the number of repetition to be done is already know and used for a result . In “while loop” the command run until a certain condition is reached and the statement is proved to be false.

Question 13

What the use of a “for loop” and it’s code ?

Answer 13

performs predefined task until a condition is met.
for<counter> in range<counter>, <counter end +1>: <something></something></counter></counter>

Question 14

What is a range and how do you code it ?

Answer 14

an range is a list of element: range(0,n)=[0,1,…,n-1]

Question 15

What is a “while loop” and it’s code

Answer 15

It’s a statement that allow code to be executed repeatedly based on a condition statement.
while <condition>: <something></something></condition>

Question 16

What is a lists ?

Answer 16

it’s a ordered collection of element in which any type of value can be stored.
this_is_a_list=[element 1, element 2, element 3]
this_is_the_first_element=this_is_a_list[0]

Question 17

What are the basic list methods ?

Answer 17

Basic List Methods
● append() Adds an element at the end of the list
● clear() Removes all the elements from the list
● copy() Returns a copy of the list
● count() Returns the number of elements with the specified value
● extend() Add the elements of a list (or any iterable), to the end of the current list
● index() Returns the index of the first element with the specified value
● insert() Adds an element at the specified position
● pop() Removes the element at the specified position
● remove() Removes the first item with the specified value
● reverse() Reverses the order of the list
● sort() Sorts the list
● len(my_list) Return the lenght of your list
● max(my_list) Return the maximun value of your list
● min(my_list) Return the minimum value of your list

Question 18

What is a function in coding ?

Answer 18

A function is a block organized, reusable code that is used to perform an action like print()

Question 19

How can I build my own function (called user-defined function)

Answer 19

1. need to use the world “def” that indicated that we are defining a new function
2. after that name the function “ex:my_function” used as a recall for the program.
3. in () we put the input of the function, if not needed nothing need to be in the ()
4. we have then the body of the function explaning what it does
5. we use then the word “return” that indicate the output of the function

Question 20

What is a “library”?

Answer 20

a library is a colluction of modules a module is a set of standardized part of independent units that can be used to construct a more complex structure. (file name is needed) after in the main program you put&raquo_space;>import name of the file

Question 21

What is a “dictionary” in coding ?

Answer 21

consists of a collection of key-value pairs. each key value pair maps the key to it’s associated value. You can define a dictionary by enclosing a comma-separated list of key-value pairs in curly brackets ({}). A colon (:) separates each key from its associated value.

Question 22

What is “object” in coding ?

Answer 22

It’s an abstract data type created by the user to represent any entity. We give attributed (properties of the object) and method (functionality of the object)

Question 23

How do we create a “classes” ?

Answer 23

1. Word used to indicate that we are defining a new object : class
2. we name the new object:
   My_Class:
3. We use the constructor of the object:
   def__init__
4. We put the attributes of the object:
   (self, param_1, param_2):
5. now the body of code:
   self.param_1=param_1
   self.param_2=param_2

Question 24

What are the different data types ?

Answer 24

● Numerical → You can apply mathematical operators on this kind of data. They are often
called continuous data.
● Textual → They contain words, sentences or, in general, text. In order to analyze this
kind of data often you have to go through a cleaning process first.
● Categorical → They represent a certain feature or characteristic and you can use them
to group data in homogeneous sets.
Ex. in weather example i have 2 categories for locations
● Date-Time → Data related to time that you can use to order chronologically the database or to subset it into shorter period of interest.

Question 25

What is a structured Data ?

Answer 25

Clearly defined and searchable types of data, it’s quantitative, stored in data warehouse, easy to search and analyse, exist in predefined formats.

Question 26

What is unstructured Data ?

Answer 26

Stored in it’s native format, qualitative, stored in data lake, require more work to process and understand, exist in a variety of formats.