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畅享聊:python切片及数据类型转换

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畅享聊：Python序列切片及数据类型转换

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Dear you, this is LearningYard Academy.

Today, the editor brings you

Enjoy chatting: Python sequence slicing and data type conversion

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Python的世界真丰富，今天小编带给大家的是关于Python序列的一些知识与操作。切片操作，先看看语法结构：

序列[start：end：step]

简单说明：

1.start表示切片的开始位置（包括开始位置），若不指定则默认为0

2.end表示结束为止（不包括结束位置），若不指定则默认为序列长度

3.step表示步长，若不指定则默认为1

整体如图

The world of Python is really rich. Today's small compilation brings you some knowledge and operations about Python sequences. For slicing, first look at the syntax structure:

Sequence [start: end: step]

Brief description:

1. Start indicates the starting position of the slice (including the starting position). If not specified, it defaults to 0

2. End indicates the end (excluding the end position). If not specified, it defaults to the sequence length

3. Step represents step size. If not specified, it defaults to 1

As shown in the figure

★

下面的这张图能够帮助理解“步长”（ps：#表示注销该部分）

The following figure can help to understand the "step size" (ps: # means to log off this part)

序列的加法与乘法：

Addition and multiplication of sequences:

这是一些序列相关的操作符和函数：

Here are some sequence related operators and functions:

看到这些多少有点心痒痒，毕竟动手实践是编程的乐趣所在嘛，这也有助于熟悉掌握。ps：w=’Hellowworld’

It's a bit itchy to see these. After all, hands-on practice is the fun of programming, which is also conducive to familiarity and mastery. ps：w=’Hellowworld’

大家可以发现，输出w的最大值是“w”，输出的最小值“d”。于是就很疑惑了，为什么会是这俩字母呢，其实每个字母都对应着一个Unicode码。这就是根据Unicode码来排的大小。

下面这些是一些基础的Python Number类型转换：

1.int(x[,base])将x转化为一个整数

2.long(x[，base])将x转化为一个长整数

3.float（x）将x转化为一个浮点数

4.str（x）将x转化为一个字符串

5.repr（x）将x转化为表达式字符串

6.eval（str）用来计算字符串中的有效python表达式，并返回一个对象

7.tuples（s）将序列s转化为一个元组

8.list(s)将序列s转化为一个列表

9.chr（x）将一个整数转化为一个字符

10.unichr（x）将一个整数转化为一个Unicode字符

11.ord（x）将一个字符转化为它的整数值

12.hex（x）将一个整数转化为一个十六进制的字符串

13.oct（x）讲一个整数转化为一个八进制的字符串

You can find that the maximum value of output w is "w" and the minimum value of output is "d". Then I was very confused. Why are these two letters? In fact, each letter corresponds to a Unicode code. This is the size according to the Unicode code.

The following are some basic Python Number type conversions:

1. int (x [, base]) converts x to an integer

2. long (x [, base]) converts x to a long integer

3. float (x) converts x to a floating point number

4. str (x) Converts x to a string

5. repr (x) Converts x to an expression string

6. eval (str) is used to calculate the valid python expression in the string and return an object

7. tuples (s) convert sequence s into a tuple

8. list (s) Converts sequence s into a list

9. chr (x) Converts an integer to a character

10. unichr (x) Converts an integer to a Unicode character

11. ord (x) Converts a character to its integer value