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.

給定一個字符串和字符數( N )，我們必須使用python程序從給定的字符串中切片并打印開始的N個字符。

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.

切片可以定義為選擇字符串的特定字符。 知道字符串的長度也可以很容易地做到這一點，如果最初沒有指定長度，我們可以通過選擇所需的字符數來實現。

Now let's understand slicing with a simple example,

現在讓我們用一個簡單的例子來了解切片

Question:

題：

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.

我們提供了一個字符串，使得前N個字符是字符串的開頭字符。 如果提供的字符串長度小于N ，則前面就是我們得到的。 現在，您的任務是創建一個新字符串，使其僅包含開頭的N個字符。

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.

在這里，我們將N視為前端數。 在這里，因為最初沒有提到字符串的長度，所以在這里我們通過考慮特定數目的字符來進行切片。

Code:

碼：

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

Output

輸出量

Choco Include Hello

翻譯自: https://www.includehelp.com/python/program-for-slicing-a-string.aspx

python字符串 切片

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