Python 1 Variables

Front 1

Value

Back 1

Letter or a number

That a program manipulates

Front 2

A data type is a category for a value. Types of datatypes

Back 2

-Integer (number)

-Floating point (number with a decimal point 2.00 or 02.000)

-Strings (uses quotation marks"")

Front 3

If you are not sure what type a value is type into interpreter:

Back 3

Print (type("Hello world"))

Or different value

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What happen when we type print(1,000,000)

Back 4

Firs semantic error because python will interpret 1,000,000 as comma separated list of three integers, result: 1 0 0

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Variable

Back 5

Is a name that refers to a value.

(one of the most powerful features in a programming language is to manipulate variables)

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Variables name

Back 6

- Can contain number and letters

- variable name can't start with a number

- for convenience it doesn't start with a capital letter

- can contain underscores (martin_matejka)

- can't contain special signs(like $ etc. )

- variable cannot be a Python keyword

Front 7

If we give variable a illegal name we will get a:

Back 7

Syntax error

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Python keywords a-c

Back 8

and

assert

break

class

continue

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Python keyword d-e

Back 9

def

del

elif

else

except

exec

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Python keyword e-g

Back 10

exec

finally

for

from

global

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Python keyword i-l

Back 11

if

import

in

is

lambda

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Python keyword n-r

Back 12

not

or

pass

print

raise

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Python keyword r-y

Back 13

return

try

while

yield

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What creates new variables and gives them values

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Assignment statement

For example:

bacon = 2,13

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What creates new variables and gives them values

Back 15

Assignment statement (variable name, equal statement and value)

For example:

bacon = 2,13

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Statements

Back 16

Is a section of a code that represents a command or a action: assignment statement or print statement

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Result of a print statement

Back 17

Value

Print (5)

5

Front 18

Expressions

Back 18

Expression is a combination of values variables and operators

Front 19

Expressions

Back 19

Expression is a combination of values variables and operators

Not every expression contains all of three. A value by it self is considered as expression and so variable

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Expressions

>>>1 + 1

2

>>>2

2

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Expression is a combination of values variables and operators

Front 21

Expressions

Back 21

Expression is a combination of values variables and operators

A expression can be a variable or a value by it self

Front 22

Expressions

Back 22

Expression is a combination of values variables and operators

Front 23

Expressions

Back 23

Expression is a combination of values, variables and operators

Or just a variable or value it self

>>>1 + 1

2

>>>2

2

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Python code style

Back 24

PEP8

Front 25

Good variable name

Back 25

Describes the data it contains