Statements

Question 1

Write down the seven assignment operators. Know what they do

Answer 1

=
\+=
-=
*=
/=
%=
**=

Question 2

There is an Acronym describing how operators are ordered. Which one?

Answer 2

PEMDAS
1. parentheses
2. exponents
3. multiplication
4. division
5. addition
6. subtraction.

Question 3

Assign 1 to 4 variables. Whats the name of the operation?

Answer 3

Chained assignment
~~~
a=b=c=d= 1
~~~

Question 4

What would this output?
a = b = c = d + 10 = 6

Answer 4

• Syntax Error
• Assignment operator expects only one variable to be on the left-hand side of the equation

Question 5

Give a full example of how to use the input variable

Answer 5

print("What is your name?")

his_name = input()
Keyboard: "David"

print("Your Name is: ", his_name) 

Question 6

Define If statements

Answer 6

• conditional statement
• evaluate an expression
• If true, following code executed
• If false, following code skipped

Question 7

What is the difference between a statement and expression?

Answer 7

• Statement is a line of code that the interpreter can execute
• Expression is a section of code that the interpreter evaluates to a certain value.

Question 8

Write down the 6 boolean operators. What do they hold?

Answer 8

They hold a bool

• They hold a Bool
  ~~~

==
!=
>
>=
<
<=
~~~

Question 9

Write a if statement asking the user if a player wants jersey number 22 or 24. Print the output

Answer 9

print("We have two choices of jersey numbers for Podolski")
print("You decide:")
print("22 or 40")
jersey_num = input()

if int(jersey_num) == 22:
    print("The Jersey number is 22")
elif int(jersey_num) == 40:
    print("The Jersey number is 40")
else:
    print("Dann nicht") 

Question 10

Do an Elif Statement inputing a number and evaluating if if number is negative, zero or positive and finish with a goodbye.

Answer 10

print("What is your number?: ")
num = int(input())
if num < 0: 
    print("Your number is negative")
elif num == 0: 
    print("Your number is zero")
else:
    print("Your number is positive")
print("Goodbye")

Question 11

Define what a loop is

Answer 11

• One of the most important and powerful tools for programming
• Repeat the same set of instructions repeatedly until a specified condition is met.

Question 12

What is a range function and which parameters are used?

Answer 12

• Creates range of numbers based on a set of parameters. Those parameters are as follows:

Start
* optional

Stop
* required

Step
* optional

Question 13

What does the for loop in a range function? Write down Example

Answer 13

• Lets you loop through all the numbers in set created by range

for x in range(3, 5):
    print(x)
    
Output:

3
4

Question 14

Create a range from 5 - 10 with the step parameter set to 2. Whats the output?

Answer 14

for x in range(5, 10, 2):
    print(x)

Output:
 5 
7
9

Question 15

Where is the first and last item of index?

Answer 15

• 0
• n-1

Question 16

Create a List of players and output that list to the screen as roster. Use the range function. The Output should be like this:

Player 1: Podolski
Player 2: Klinsmann
Player 3: Schweini

Answer 16

my_players = ["Podolski", "Klinsmann", "Schweini"]

for x in range(3):
    print("Player " + str(x+1) + ": " + my_players[x])
    

Question 17

Explain the basic function of a while Loop

Answer 17

• Keyword “while” followed by expression.
• If True, the code attached to the while loop will be executed over and over.
• If False, the while loop will exit and execution will resume at the point after the while loop and its associated code block.

Question 18

Get the following outpout by creating a while loop: Player 1: Podolski Player 2: Klinsmann Player 3 Schweini

Answer 18

                 

my_players = ["Podolski", "Klinsmann", "Schweini"]

x = 0
while x < len(my_players):
    print("Player " + str(x+1) + ": " + my_players[x])
    x += 1
print("End of roster")                                      

Question 19

Print the list of players with range function, but skip Klinsman. How?

Answer 19

• Continue Keyword

my_players = ["Podolski", "Klinsmann", "Schweini"]

for x in range(3)
    if x == 1:
        continue
    print("Player " + str(x+1) + ": " + my_players[x])
print("End of roster"                                      

Question 20

How to loop through all even numbers from 2 to 20

Answer 20

for x in range(2, 21, 2)

Question 21

What is an iterator? Explain and Demonstrate

Answer 21

• Creates iteration object, captured in variable
• First call of function return first list and so on
• Use next()

my_list = [4, 8, 15, 16, 23, 42]
my_iterator = iter(my_list)
print(next(my_iterator))

Question 22

What is a Stolteration error and how to avoid. Demonstrate example multiplying numbers in list and storing result into new list. There are two ways of doing so, use both

Answer 22

First Method

• Occurs when trying to iterate beyond bounds of list, tupil, or dictionary
• Mitigation: Use iterator in conjuntion with for loop

my_numbers = [2, 3, 5, 8, 5]
my_new_numbers= []

for x in my_numbers:
    my_new_numbers.append(x*x)
    
print(my_new_numbers)

Second Method
my_numbers = [2, 3, 5, 8, 5]
my_new_numbers= [n*n for n in my_numbers]

Question 23

Create a list of squares from an original list, but only if the original value is less then 20. Use the shortest format.and the long format

Answer 23

my_numbers = [4, 8, 15, 16, 23, 42]
my_new_numbers = [n*n for n in my_numbers if n < 20]

Question 24

I have a list called my_list that contains four values (1, 2, 3, and 4). I want to create a new list called my_new_list from my existing list my_list. I want my_new_list to contain only the even values from my_list, and I want each of those values to be multiplied by 100. Demonstrate

Answer 24

my_list = [1, 2, 3, 4]
new_list = [num*100 for num in my_list if num % 2 == 0]
print(new_list)