Structure of Algorithm and Programming Chapter 5

Python

Python

A popular programming language, released in 1991.

The use of Python

Web development (server-side), Software development, Mathematics and System scripting.

The creator of Python

Guido van Rossum

Integrated Development Environment (IDE)

Allows common activities of writing software and identify programming errors.

Syntax Errors

Refers to the structure of a program and the rules about that structure.

Runtime Errors

Also called exceptions, usually indicate that something exceptional (and bad) has happened.

Logic Errors

Code will run successfully but the output is not expected.

Indentation

The spaces at the beginning of a code line to indicate a block of code and must be at least one.

Comment and Documentation strings

Use for the purpose of in-code documentation.

Comments

Start with #

Documentation string or docstring

Statements that is included within the triple quote """.

Comment

#This is a message

Documentation

“““

This is a message

“““

Reserved words

Have predefined meaning and syntax in the language.

Variables

The containers for storing data values.

Variables name

• must start with a letter or underscore.

• can only contain alpha-numeric characters and underscores

• case- sensitive

• cannot use keywords

Text Type

str

Numeric Type

int, float, complex

Boolean Type

bool

Sequence type

list, tuple, range

Set type

set

Binary type

bytes, bytearray, memoryview

int

45

float

45.0

str

“hello”

complex

1j

complex

1+9j

complex

9j+5

list

[23,42,54,”hello”]

tuple

(23,43,54,”hello”)

tuple((23,43,56))

tuple

list((9,4,3,2,6))

list

Arithmetic Operator

+, - , * , / …

Addition

+

Subtraction

-

Multiplication

*

Division

/

Modulus

%

Exponent

**

Floor division

//

Relational Operator

>,<,==,<=,>= …

More than

>

Less than

<

Equal

==

Not Equal

!=

More than or equal to

>=

Less than or equal to

<=

Logical Operator

not, and, or …

not

not True

and

True = True + True

False = True +False

False = False + False

or

True = True + True

True = True + False

False = False + False

input() function

Ask input from the user

print() function

Displays the output and jump to the next line.