python字符串切片_用于切片字符串的Python程序

- 日理万妓 2023-03-05 12:42 16阅读 0赞

python字符串 切片

Given a string and number of characters (**N**), we have to slice and print the starting **N** characters from the given string using python program.

给定一个字符串和字符数( **N** )，我们必须使用python程序从给定的字符串中切片并打印开始的**N个**字符。

**SLICING:**

**切片：**

Slicing can be defined as selecting specific characters of a string. This can be performed easily by knowing the length of a string also if the length is not specified initially we can do it by selecting the number of characters that we require.

切片可以定义为选择字符串的特定字符。 知道字符串的长度也可以很容易地做到这一点，如果最初没有指定长度，我们可以通过选择所需的字符数来实现。

Now let's understand slicing with a simple example,

现在让我们用一个简单的例子来了解切片

**Question:**

**题：**

We are provided with a string such that the first **N** characters are the front characters of the string. If the provided string length is less than **N**, the front is whatever we have got. Now your task is to create a new string such that it contains only the **N** characters from the front.

我们提供了一个字符串，使得前**N个**字符是字符串的开头字符。 如果提供的字符串长度小于**N** ，则前面就是我们得到的。 现在，您的任务是创建一个新字符串，使其仅包含开头的**N个**字符。

**Example:**

**例：**

slice('Javan', 3) = 'Jav'
        slice('Chocolava', 5) = 'Choco'
        slice('jio', 6) = 'jio'

**Solution:**

**解：**

Here we have considered **N** as a number of the front end. Here as the length of the string is not mentioned initially so here we have done slicing by considering a specific number of characters.

在这里，我们将**N**视为前端数。 在这里，因为最初没有提到字符串的长度，所以在这里我们通过考虑特定数目的字符来进行切片。

**Code:**

**码：**

def slice(str, n):
        if len(str) < n:
            n = len(str)
        front = str[:n]
        return front
    
    
    print (slice('Chocolate', 5))
    print (slice('IncludeHelp', 7))
    print (slice('Hello', 10)) #will print all characters

**Output**

**输出量**

Choco
    Include
    Hello

> 翻译自: [https://www.includehelp.com/python/program-for-slicing-a-string.aspx][https_www.includehelp.com_python_program-for-slicing-a-string.aspx]

python字符串 切片

[https_www.includehelp.com_python_program-for-slicing-a-string.aspx]: https://www.includehelp.com/python/program-for-slicing-a-string.aspx