Python two, Python process-oriented programming Quick Start

First, the data structure

program = data structure + algorithm

Data:

A collection of data elements that are organized in a way, such as numbering elements , that can be numbers or characters, or even other data structures.

The most basic data structure of Python is the sequence

Each element in the sequence is assigned an ordinal (that is, the position of the element) and also the index: index numbering starts at 0

Python contains 6 built-in data series: List, Ganso, String, Unicode string, Buff object, and Xrange object

Ii. key elements of Python

Basic data types

Object reference

Combining data types

logical operators

Control flow Statements

Arithmetic operators

Input/Output

Creation and invocation of functions

1. Basic data types in Python

Any programming language must be able to represent basic data items

The basic data types in Python are:

Integral type:

Integral type: Immutable type

-257.20162

Boolean type:

True,false

Floating-point types:

Floating point number:

3.141592

Plural:

3+6j

Decimal digits:

String

' GNU is not Unix ', ' Hello '

2. Object reference (variable)

Python saves all data as a Memory object

In Python, a variable actually refers to a reference to a Memory object

Dynamic type:

At any point in time, an object reference can re-reference a different object (with different data types) whenever necessary.

The built -in function type () is used to return the data type of a given data item

"=" is used to bind a variable name to an object in memory: If the object exists beforehand, it is bound directly; otherwise, the referenced object is created by "="

n [1]: a= ' mageedu ' in [2]: Type (a) out[2]: Strin [3]: a=3.14in [4]: Type (a) out[4]: Floatin [5]:

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Python two, Python process-oriented programming Quick Start