使用 Python 从字符串中移除首个单词

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Python 是一种常用的编程语言，用于许多不同的目的，例如 Web 开发、数据科学、机器学习以及执行许多不同的自动化流程。在本文中，我们将学习如何使用 Python 从字符串中移除首个单词。

从字符串中移除首个单词的不同方法

split 函数

在这种方法中，我们将字符串拆分为子字符串以移除首个字符串。我们将使用 split 函数来实现相同的目的。使用 split 函数从字符串中移除首个单词的语法如下所示

def initial_string(string):   #The string is given as input
    data = string.split()     #The string is then split
    if len(data) > 1:         #If it has more than one element then it is joined
        return ' '.join(data[1:])
    else:
        return ""

示例

让我们举个例子来理解它的用法

def initial_string(string):   #The string is given as input
    data = string.split()     #The string is then split
    if len(data) > 1:         #If it has more than one element then it is joined
        return ' '.join(data[1:])
    else:
        return ""
whole_string = "Today, We will work on Python."
new_string = initial_string(whole_string)
print(new_string)

输出

上述示例的输出如下所示

We will work on Python.  

re 模块

re 模块提供正则表达式支持。它使用特定的模式来查找特定的字符串或子字符串。我们将使用相同的模式来查找首个字符串，然后将其移除。使用 re 模块从字符串中移除首个单词的语法如下所示

import re  # Do not forget to import re module or else error might occur.

def initial_string(string):  #The string is given as input
    pattern = r'^\w+\s+'  # A pattern is defined to find the initial string
    return re.sub(pattern, '', string)   # The initial string is substituted with an empty space

示例

上述方法的示例如下所示

import re  # Do not forget to import re module or else error might occur.

def initial_string(string):  #The string is given as input
    pattern = r'^\w+\s+'  # A pattern is defined to find the initial string
    return re.sub(pattern, '', string)   # The initial string is substituted with an empty space
whole_string = "Today We will work on Python."
new_string = initial_string(whole_string)
print(new_string)  #Displaying the output after removing the initial string

输出

上述方法的输出如下所示

We will work on Python. 

find 函数

find 函数用于使用其位置在字符串中查找特定的单词或元素。在这种方法中，我们将使用相同的函数来查找第一个位置的单词并将其移除。使用 find 函数移除首个单词的语法如下所示

def initial_string(string):  #The string is given as input
    first_word = string.find(' ')   #Find() is used to find the initial word of the string and if space is found it returns back
    if first_word != -1:
        return string[first_word + 1:]
    else:
        return ""

示例

使用上述语法的示例如下所示

def initial_string(string):  #The string is given as input
    first_word = string.find(' ')   #Find() is used to find the initial word of the string and if space is found it returns back
    if first_word != -1:
        return string[first_word + 1:]
    else:
        return ""
whole_string = "Today, We will work on Python."
new_string = initial_string(whole_string)
print(new_string)  #Displaying the output after removing the initial string

输出

上述代码的输出如下所示

We will work on Python. 

空格分隔符

我们使用字符串 split 函数将字符串拆分为两个不同的部分，然后移除具有多个元素的字符串，并移除首个单词。使用空格分隔符从字符串中移除首个单词的语法如下所示

def initial_string(string):  #The string is given as input
    first = string.split(' ', 1)  #Second argument to split the string into two parts   
    if len(first) > 1:    # Checking for more than 1 element
        return first[1]   #If more than 1 element is present it returns the first part
    else:
        return ""       #If only 1 element is present it returns the second part

示例

上述方法的示例如下所示

def initial_string(string):  #The string is given as input
    first = string.split(' ', 1)  #Second argument to split the string into two parts   
    if len(first) > 1:    # Checking for more than 1 element
        return first[1]   #If more than 1 element is present it returns the first part
    else:
        return ""       #If only 1 element is present it returns the second part
whole_string = "Today, We will work on Python."
new_string = initial_string(whole_string)
print(new_string)   #Displaying the output after removing the initial string

输出

上述示例的输出如下所示

We will work on Python.  

partition 方法

Python 的 partition 函数根据所选的分隔符将字符串划分为三个部分。因此，分隔符本身、分隔符之前的区域和分隔符之后的区域组合成一个元组。使用 partition 方法从字符串中移除首个单词的语法如下所示

def initial_string(string):   #The string is given as input
    _, separator, remainder = string.partition(' ') # The partition method is used to seprate the string at the first space in the string
    if separator:           #If a seprator will be found then it will return remainder or else a empty space will return
        return remainder
    else:
        return ""

示例

使用上述方法的示例如下所示

def initial_string(string):   #The string is given as input
    _, separator, remainder = string.partition(' ') # The partition method is used to seprate the string at the first space in the string
    if separator:           #If a seprator will be found then it will return remainder or else a empty space will return
        return remainder
    else:
        return ""
whole_string = "Today, We will work on Python."
new_string = initial_string(whole_string)
print(new_string)   #Displaying the output after removing the initial string

输出

上述代码的输出如下所示

We will work on Python.  

结论

使用 Python 从字符串中移除首个单词有很多不同的方法，初学者有必要了解所有这些编程方法，以便在不同领域的不同项目中工作时，能够在合适的问题中使用合适的逻辑。程序员可以使用他/她选择的方法，以及适合编程领域并缩短编程时间的方法。