Python中兩個字串的並集運算

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Python 是一種全球程式設計師廣泛使用的語言，用於機器學習、資料科學、Web 開發以及許多其他自動化操作。它具有許多不同的功能，可以幫助我們處理許多不同的專案。Python 的一項這樣的功能就是並集運算。並集運算意味著將兩個不同的字串組合成一個公共字串，同時去除兩個字串中所有公共元素。在本文中，我們將學習可用於兩個字串並集運算的不同方法。

並集運算的不同方法

集合

集合是 Python 中提供的一種特性，用於在一個單一資料集中儲存多個項。它具有去除字串中所有公共元素的內建功能。讓我們來看一個例子以便更好地理解。

示例

def multiple_strings(first, second):  # The input of both the strings are given
    data1 = set(first)  # Both the strings are then converted into data sets
    data2 = set(second)
    union_data = data1.union(data2) # After conversion, the data sets are combined with the help of union operation
    final_string = ''.join(union_data) # The Combined data set is then converted back into strings
    return final_string

# Example 
first = "What"  # The two input strings are defined 
second = "Where"
final_result = multiple_strings(first, second) # The function multiple_strings is run
print(final_result) # The output after union Operation Will be shown

輸出

上述示例的輸出如下所示

Wraeth  

字典

在這種方法中，我們將使用 Python 字典進行並集運算。字典將用於儲存所有資料作為字串，然後對其執行並集運算。此方法的並集運算示例如下所示

示例

def multiple_strings(first, second): # The input of both the strings are given
    union_dict = {} # A new dictionary is created for the union operation
    for char in first:  # All the elements in both the strings are checked and then they are added in the new dictionary created
        union_dict[char] = True
    for char in second:
        union_dict[char] = True  # No duplicate characters will be added because dictionary keys will take input of different characters only
    union_string = ''.join(union_dict.keys())    # Once the union operation of the keys is performed, then we will convert the dictionary key back into string
    return union_string

# Example 
first = "What"  # The two input strings are defined 
second = "Where"
final_result = multiple_strings(first, second) # The function multiple_strings is run
print(final_result) # The output after union Operation Will be shown

輸出

上述示例的輸出如下所示

Whater 

檢查列表和成員資格

這是一種非常簡單的執行並集運算的方法。我們將簡單地將字串轉換為列表以進行並集運算。此方法的示例如下所示

示例

def multiple_strings(first, second): # The input of both the string is given
    combined_strings = list(first) # The first string is converted into a list
    for char in second:  #If the element in second string is not present in first string then they are combined into the first list and the union operation is performed
        if char not in combined_strings:
            combined_strings.append(char)
    final_string = ''.join(combined_strings) #The lists are then converted back into string
    return final_string

# Example 
first = "What"  # The two input strings are defined 
second = "Where"
final_result = multiple_strings(first, second) # The function multiple_strings is run
print(final_result) # The output after union Operation Will be shown

輸出

上述示例的輸出如下所示

Whater  

集合和管道運算子的組合使用

此方法是一種複雜的方法，不應在簡單的組合情況下使用。在此方法中，字串被轉換為集合，然後我們不直接使用並集，而是使用管道運算子。讓我們來看一個例子以便更好地理解。

示例

def multiple_strings(first, second): # The input of both the string is given
    first_set = set(first) # Both the strings are converted into sets
    second_set = set(second)
    final_string = ''.join(first_set | second_set) # Using the pipe operator the respective sets are combined after removing the common elements
    return final_string

# Example 
first = "What"  # The two input strings are defined 
second = "Where"
final_result = multiple_strings(first, second) # The function multiple_strings is run
print(final_result) # The output after union Operation Will be shown

輸出

上述示例的輸出如下所示

Wraeth 

Itertools 模組

Itertools 模組用於有效地檢查資料集中存在的全部迴圈。它具有許多不同的函式，可用於許多不同的目的。我們將使用兩個這樣的不同函式來執行並集運算。讓我們來看一個例子以便更好地理解。

示例

import itertools # Do not forget to import itertools or else error might occur
def unique_everseen(iterable, key=None):
    seen = set()
    seen_add = seen.add
    if key is None:  # The input of both the string is given
        for element in itertools.filterfalse(seen.__contains__, iterable):# Through the chain() function we will combine both the strings into cone common string
            seen_add(element)
            yield element
    else:
        for element in iterable:
            k = key(element)
            if k not in seen:
                seen_add(k)
                yield element

def multiple_strings(first, second):  # The input of both the string is given
    union_string = ''.join(unique_everseen(itertools.chain(string1, string2)))# With the help of unique.everseen() function we will remove all the common elements from the combined string
    return union_string

# Example 
first = "What"  # The two input strings are defined 
second = "Where"
final_result = multiple_strings(first, second) # The function multiple_strings is run
print(final_result) # The output after union Operation Will be shown

輸出

上述示例的輸出如下所示

Wraeth 

結論

瞭解可用於執行並集運算的不同方法非常重要。本文介紹了可用於執行並集運算的不同方法。可以根據方便性和應用領域使用上述任何一種方法。