1 Introduction to Python

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來自 Nanjing University 的課程

Data Processing Using Python

84 個評分

Nanjing University

Data Processing Using Python

84 個評分

This course (The English copy of "用Python玩转数据" <https://www.coursera.org/learn/hipython/home/welcome>) is mainly for non-computer majors. It starts with the basic syntax of Python, to how to acquire data in Python locally and from network, to how to present data, then to how to conduct basic and advanced statistic analysis and visualization of data, and finally to how to design a simple GUI to present and process data, advancing level by level. This course, as a whole, based on Finance data and through establishment of popular cases one after another, enables learners to more vividly feel the simplicity, elegance and robustness of Python. Also, it discusses the fast, convenient and efficient data processing capacity of Python in humanities and social sciences fields like literature, sociology and journalism and science and engineering fields like mathematics and biology, in addition to business fields. Similarly, it may also be flexibly applied into other fields. The course has been updated. Updates in the new version are : 1) the whole course has moved from Python 2.x to Python 3.x 2) Added manual webpage fetching and parsing. Web API is also added. 3) Improve the content order and enrich details of some content especially for some practice projects.

從本節課中

Basics of Python

Hi, guys, welcome to learn Module 01 “Basics of Python”! I’ll first guide you to have a glimpse of its simplicity for learning as well as elegance and robustness. Less is more: the author of Python must know this idea well. After learning this module, you can master the basic language structures, data types, basic operations, conditions, loops, functions and modules in Python. With them, we can write some useful programs!

1 Introduction to Python6:17

2 The First Python Program15:51

3 Basics of Python Syntax11:19

4 Data Types of Python9:26

5 Basic Operations of Python10:14

6 Functions, Modules and Packages of Python7:05

與講師見面

ZHANG Li
associate professor
Department of Computer Science

Many components of google's web crawler and search engine

were developed with Python,

the YouTube system also makes extensive use of Python,

and NASA,

also has several systems that have adopted Python.

As for the website where chinese young people loving culture and arts gather,

as you may guess douban.com,

the main developing language is also Python.

It may be a little surprising,

why is Python so greatly favored?

At first, look at this.

The design philosophy of Python programming language is

simplicity, explicitness and elegance.

It is easy to use as a simple scripting language

and an interpreted programming language,

also with powerful and universal capabilities

of a traditional compiled programming language.

It is also very elegant

in its way of expression, form of syntax and so on.

We'll gradually feel its elegance.

Then let's talk about

the evolution of the programming language of Python.

This is the author of Python

Guido Van Rossum.

During the Christmas season in 1989,

Guido decided to develop a new scripting interpreted language

to keep him occupied.

For most of us,

like me,

I would often watch one episode of "One Piece"

to kill time.

The gap is so huge.

The first Python interpreter was developed in 1991.

The name originated from Guido's favored

sketch comedy played by BBC -

"Monty Python's Flying Circus".

Python is actually between C and Shell.

It is a programming language easy to learn and use,

and with complete capabilities.

We will see and feel those specific details

one by one later.

As for Python,

we may describe it with so many titles.

For instance, very commonly

we would refer to Python as a glue language,

meaning that it can be easily connected with another well-known

programming language,

like C or C++.

We may also think of it as a scripting language,

surely compared with an average scripting language.

It has stronger scripting power,

also it supports object-orientation,

including inheritance, overloading, derivation etc.

As for those basic functions of object-orientation,

we will talk about

this part of contents in the following week.

Python is easy to learn, read and maintain.

It also has a lot of powerful third party libraries.

These upsides make it a very very popular programming language now.

Currently two versions of Python are available

namely Python 2 and 3.

Let's look at the official website of Python,

here it is.

Which one should I choose? Python 2 or 3?

I've heard such a story from the Internet.

There were a couple of lovers

and both of them were IT engineers,

and one day

both of them started programming in Python.

One of them used Python 2

and the other used Python 3,

then as program writing progressed, they broke up.

The actual difference between the two is not so big,

the basic design philosophy remains unchanged,

the grammatical basis is largely unchanged,

then Python 2 or 3?

The main consideration is your libraries support Python 2 or 3.

A small number of libraries are still based on Python 2,

in that case Python 2 is ok.

In most cases, we would choose Python 3.

This course is based on Python 3.

According to the statistic results

conducted by the famous index of programming language popularity PyPL,

on search frequencies of programming language courses on google,

we may note that Python has had good results

and attracts increasing attention.

One of Python's highly attractive functions

is its extraordinarily convenient and powerful

capacity of data processing and statistics.

It is also the key contents for our course.

In addition,

Python has applications in many other fields.

For example, we will focus on

GUI development later in this course.

It is also a vital application of Python

together with Web development.

Python defines many interfaces

which can be used to coordinate

the communication between http servers and web programs.

Also, Python is closely integrated with many operating systems,

its standard library includes

many libraries that can call functions of operating system.

It also has many applications in multimedia.

For instance for producing 3D scenes in computer games.

Python has so powerful capabilities

that it has a ton of very important applications

and some super programmers as well.

Before formally starting Python programming,

let's look at the aphorisms of Python,

aka "the zen of Python"

written by Tim Peters.

Many Chinese people have translated it

of them. Two versions are more popular.

Like the first three lines,

one Chinese version translated by LAI Yonghao is available:

优美胜于丑陋(From Mars^_^)

明了胜于晦涩

简洁胜于复杂.

Another version is much more concise,

美胜丑明胜暗简胜复.

Can you feel

the design philosophy of Python?

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