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一日速成Python3：易学实用入门指南

Python3入门

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"《Python3入门指南》是一本旨在帮助读者在短时间内全面理解Python 3基础知识的实用教材。本书避免了传统Python教程中的繁琐和复杂，采用简洁易懂的编写风格，使初学者能够快速上手并将其应用到实际编程项目中。 Python 3由Guido Van Rossum开发，以其优雅的语法和可读性强的代码而闻名。对于刚接触编程的人员来说，Python是一个理想的起点。它具有广泛的应用领域，包括但不限于图形用户界面（GUI）开发、Web应用程序、系统管理任务、金融计算、数据分析以及可视化，几乎无所不能。作为解释型语言，Python通过逐行解析代码来执行，不像编译型语言如C++那样先编译后执行。解释型语言如Python的一个显著特点是运行速度相对较慢，但对初学者更为友好，无需面对编译型语言中编写基础功能的挑战。然而，如果你追求更高的性能，学习和使用像C++这样的编译型语言会带来性能优势。不过，这种优势往往伴随着更复杂的代码编写过程。在本书的第一章“Python编程入门”中，作者将引导读者了解Python的基础概念，包括何为Python、其优点、以及它与编译型语言的主要区别。学习者将明白虽然解释型语言在初始速度上可能稍逊一筹，但对于快速学习和实践编程来说，Python的易用性和灵活性是不可忽视的优势。《Python3入门》不仅适合想要快速入门的初学者，也为那些希望以简洁方式掌握Python核心概念的人提供了宝贵资源。无论是为了个人兴趣还是职业发展，这都是一本值得一读的Python入门书籍，能帮助读者在短时间里建立起坚实的Python编程基础。"

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THEPYTHONGURU

HTTP://THEPYTHONGURU.COM

Complex number

As you may now complex number consists of two parts real and imaginary, and is denoted by j .You can

define complex number like this:

>>> x = 2 + 3j # where 2 is the real part and 3 is imaginary

Determining types

Python has type() inbuilt function which is use to determine the type of the variable.

>>> x = 12

>>> type(x)

Python operators

Python has the different operators which allows you to carry out required calculations in your program.

+ , - and * works as expected, remaining operators require some explanation.

/ - Float Division : / operator divides and return result as floating point number means it will always

return fractional part. For e.g

>>> 3/2

1.5

// - Integer Division : // perform integer division i.e it will truncate the decimal part of the answer and

return only integer.

THEPYTHONGURU

HTTP://THEPYTHONGURU.COM

>>> 3//2

** - Exponentiation Operator : This operator helps to compute a

(a raise to the power of b). Let's take

an example:

>>> 2 ** 3 # is same as 2 * 2 * 2

% operator : % operator also known as remainder or modulus operator. This operator return remainder

after division. For e.g:

>>> 7 % 2

Operator Precedence

In python every expression are evaluated using operator precedence. Let's take an example to make it

clear.

>>> 3 * 4 + 1

In the above expression which operation will be evaluated first addition or multiplication? To answer

such question we need to refer to operator precedence list in python. Image below list python

precedence order from high to low.

THEPYTHONGURU

HTTP://THEPYTHONGURU.COM

as you can see in table above * is above + , so * will occur first then addition. Therefore the result of

the above expression will be 13 .

>>> 3 * 4 + 1

>>> 13

Let's,take one more example to illustrate one more concept.

>>> 3 + 4 - 2

In above expression which will occur first addition or subtraction. As we can see from the

table + and - have same precedence, then they will be evaluated from left to right, i.e addition will be

applied first then subtraction.

>>> 3 + 4 – 2

>>> 5

The only exception to this rule is assignment operator (=) which occur from right to left.

a = b = c

You can change precedence by using parentheses () , For e.g

>>> 3 * (4 + 1)

>>> 15

As you can see from the precedence table () has highest priority so in expression 3 * (4 + 1) ,

(4 + 1) is evaluated first then multiplication. Hence you can use () to alter order of precedence.

THEPYTHONGURU

HTTP://THEPYTHONGURU.COM

Augmented Assignment Operator

These operator allows you write shortcut assignment statements. For e.g:

>>> count = 1

>>> count = count + 1

>>> count

by using Augmented Assignment Operator we can write it as:

>>> count = 1

>>> count += 1

>>> count

similarly you can use - , % , // , / , * , ** with assignment operator to form augmented

assignment operator.

In the next chapter we will learn about python strings.

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