Python

Question 1

What it is the syntax for a print statement when using a variable

Answer 1

print(variable name)

Question 2

What it is the syntax for a print statement when using a string

Answer 2

print(“string”)

Question 3

what is the command for the user to input data

Answer 3

input()

Question 4

what is the command to allow the user to input a hole number value

Answer 4

int(input())

Question 5

What is the command for allowing the user to enter a decimal value

Answer 5

float(input())

Question 6

what are the two types of loop

Answer 6

While loop

For loop

Question 7

What is the syntax for a while loop

Answer 7

while counter

Question 8

What is the syntax for a for loop

Answer 8

For counter in range(0,5):

print(counter)

Question 9

Define Pseudocode

Answer 9

Pseudocode is an informal high-level description of the operating principle of a computer program or other algorithm. It uses the structural conventions of a programming language, but is intended for human reading rather than machine reading.

Question 10

How is Pseudocode started and ended in a python shell

Answer 10

’’’

’’’

Question 11

What is the command for calling a function

Answer 11

functionname()

Question 12

What is string slicing and what is it used for

Answer 12

String slicing is used for either removing locating items in a string

Question 13

State the commands used in string slicing

Answer 13

x = y[w:z]
Purpose: To extract characters from the middle of a string.

x = y[-z:]
Purpose: To return characters to the right of a string.

x = y[:z]
Purpose: To return characters to the left of a string

Question 14

Name the nine Logical operators that can be used in if elif and else statements

Answer 14

== equals 
!= does not equal 
 greater than 
>= greater than or equal to 
and both conditions must be true
or one condition must be true
not condition is not true

Question 15

Name the 7 arithmetic operations

Answer 15

\+ addition
- subtraction
* multiplication
/ division 
** power of 
// integer division  
% modulus (remainder after division)

Question 16

What is the syntax for creating a list

Answer 16

x = []

Question 17

What is the command for inserting to a list

Answer 17

listname.append(item)

Question 18

What is the command for removing an item from a list

Answer 18

listname.Remove(item)

Question 19

What is the command for sorting a list

Answer 19

listname.sort()

Question 20

What is the command for reverses the order of the items in a list

Answer 20

listname.reverse

Question 21

What is the command for removing all items from a list

Answer 21

del listname[:]

Question 22

What is the command for returning a list if it contains a specific value or item

Answer 22

if x in listname:

Question 23

Name the two types of variables

Answer 23

Global

Local

Question 24

Give the syntax for a global variable

Answer 24

global=0

Question 25

Give the syntax for a local variable

Answer 25

``` def function: variable_name=variable_info ```

Question 26

How to begin a serial file

Answer 26

text_file = open("filename", "w")

Question 27

Name the command for input the data of a serial file into a variable.

Answer 27

x = textfile.read()

Question 28

Name the command for Reads a single line of data from an open file into x.

Answer 28

variable = LineInput(1)

Question 29

Name the command for writing a single item of data to an open file.

Answer 29

Example code: textfile.write("data to write")

Question 30

Name the command that commits any data in the file buffer to storage and closes the file. If a file is not closed, data will not be written.

Answer 30

textfile.close

Question 31

Define the try keyword

Answer 31

‘Try’ is the keyword to put before a run time error is likely to occur

Question 32

Define the except keyword

Answer 32

The code following ‘except’ is the code | to execute if an error occurs.

Question 33

What is the syntax for try

Answer 33

try: | …

Question 34

What is the syntax for except

Answer 34

except: | …

Question 35

Give the syntax for a if statement

Answer 35

if .... :

Question 36

Give the syntax for an else statement

Answer 36

else: | ...

Question 37

Give the syntax for ending an if statement in pseudocode

Answer 37

Endif

Question 38

Give the syntax for ending a function in pseudocode

Answer 38

Endfunction_name

Question 39

Name the three types of error in programming

Answer 39

Syntax errors when you mistype a keyword, the program doesn’t recognise it as a valid command and will not run. Logic errors where the program runs but you get the wrong result, perhaps not always consistently! Logic errors are called bugs. Run-time errors that occur in exceptional circumstances such as division by zero and incorrect data type input. These should be trapped with exception handling commands

Question 40

Name the types of validation

Answer 40

Presence checks: did the user actually enter any data? Range checks: does the input fall within a valid range of numbers? Format check: does the input match a recognised format, e.g. LLNN NLL for postcode Length check: is the input the required length of characters, e.g. minimum 8 character password