使用 Python 從字串中移除首個單詞

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Python 是一種常用的程式語言，用於許多不同的目的，例如 Web 開發、資料科學、機器學習以及執行許多不同的自動化流程。在本文中，我們將學習如何使用 Python 從字串中移除首個單詞。

從字串中移除首個單詞的不同方法

split 函式

在這種方法中，我們將字串拆分為子字串以移除首個字串。我們將使用 split 函式來實現相同的目的。使用 split 函式從字串中移除首個單詞的語法如下所示

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

讓我們舉個例子來理解它的用法

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)

輸出

上述示例的輸出如下所示

We will work on Python.  

re 模組

re 模組提供正則表示式支援。它使用特定的模式來查詢特定的字串或子字串。我們將使用相同的模式來查詢首個字串，然後將其移除。使用 re 模組從字串中移除首個單詞的語法如下所示

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

輸出

上述方法的輸出如下所示

We will work on Python. 

find 函式

find 函式用於使用其位置在字串中查詢特定的單詞或元素。在這種方法中，我們將使用相同的函式來查詢第一個位置的單詞並將其移除。使用 find 函式移除首個單詞的語法如下所示

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

使用上述語法的示例如下所示

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

輸出

上述程式碼的輸出如下所示

We will work on Python. 

空格分隔符

我們使用字串 split 函式將字串拆分為兩個不同的部分，然後移除具有多個元素的字串，並移除首個單詞。使用空格分隔符從字串中移除首個單詞的語法如下所示

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

輸出

上述示例的輸出如下所示

We will work on Python.  

partition 方法

Python 的 partition 函式根據所選的分隔符將字串劃分為三個部分。因此，分隔符本身、分隔符之前的區域和分隔符之後的區域組合成一個元組。使用 partition 方法從字串中移除首個單詞的語法如下所示

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

輸出

上述程式碼的輸出如下所示

We will work on Python.  

結論

使用 Python 從字串中移除首個單詞有很多不同的方法，初學者有必要了解所有這些程式設計方法，以便在不同領域的不同專案中工作時，能夠在合適的問題中使用合適的邏輯。程式設計師可以使用他/她選擇的方法，以及適合程式設計領域並縮短程式設計時間的方法。