Debug 4.2. Mind Reader with starter code

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Debug 4.2. Mind Reader with starter code

Debug 4.2. Mind Reader  with starter code

Code Clips

Display to screen (Python console)

basic display

print('Add text here') # with a new line

print('Add text here', end=' ') # stay on the same line, set end to space character

print('\n\n') # display blank line (2)

Key Points about using print()

place message in round brackets ( )

place text in straight 'single quote marks ' (not curly ones) (double quote also OK)

display message with variables and text

print(number + ' + ' + str(number) + ' = ' + answer)

Display variables together in a message by concatenating text and variables.

Notice the spaces inside ' text '

The + concatentation operator is exactly the same symbol as the addition operator

When using concatenation, python requires you to cast non-string values/variables to a string value by using the str() function

If you want to be sure that numbers are added arithmetically then put them in brackets: print(player + str(i+1)) and not print(player + str(i) + str(1))

python offers another way to display multiple items: use commas

automatic conversion to string values, automatic space inserted

please note that this is not concatenation

print ('The score is', score, 'and the type is', type(score))

Variables

you do not need to declare variables in python

when you assign a (new) values to a variable, it takes on the type of that value

(python is a dynamically typed-language)

variable names should be descriptive and always used with exactly the same spelling and case

str - a string stores text, any combination of (letters, digits and symbols)

textVar = '' # assign a (empty) string value

int - stores positive or negative Integers (whole numbers)

intVar = 0 # assign an integer value

float - stores decimal numbers

floatVar = 0.0 # assign a real number/ decimal number/ floating point

There is no chracter type in python, simply use a string of length 1

char - stores single characters which can be letters, digits or symbols.

characterVar = 'F' # assign a single character string

bool - the values True or False

booleanVar = True # use a capital T or F

checking the type of a variable

you can check the type of a variable by using the type() function

score = 50

print('The score is ' + str(score) + ' and the type is ' + str(type(score)))

>> The score is 50 and the type is <class 'int'>

Keyboard Input, Storing With Variables

All input is read as text/string.

You should cast input values to the required data-type before storing into a variable

python will not warn you if you enter the wrong type of value until later if you try to use it for an operation

String - stores text; any combination of (letters, digits and symbols)

textVar = input('Insert prompt here: ')

Integer - stores positive or negative whole numbers

intVar = int(input('Insert prompt here: '))

float - stores decimal numbers

floatVar = float(input('Insert prompt here: '))

Character - stores single characters which can be letters, digits or symbols

this is exactly the same as for string/text

charVar = input('Insert prompt here: ')

Boolean - stores true or false

you must enter the values 1 for True and 0 for False for this to work

booleanVar = bool(int(input('Insert prompt here: ')))

Text operation

Concatenation of text

join text in username variable to the literal text, store as eMailAddress.

The + concatentation operator is exactly the same symbol as the addition operator

When using concatenation, python requires you to cast non-string values/variables to a string value by using the str() function

If you want to be sure that numbers are added arithmetically then put them in brackets: print(player + str(i+1)) and not print(player + str(i) + str(1))

emailAddress = username + '@gmail.com'

Arthimetic Operators

Addition

This code adds two numbers together and assigns the result to the additionAnswer variable

additionAnswer = numberOne + numberTwo

keeping a count by adding on 1

If you had to count how many keys are on your keyboard you might check along the rows thinking: 1, 2, 3, … It’s a very common task where you add on 1 to your count. In fact you a re following a well known algorithm: