Python 检查字符串是否包含所有相同的字符的方法

Python是一种非常常用的编程语言，用于不同的目的，如Web开发、数据科学、机器学习和执行许多不同的自动化过程。在本文中，我们将学习不同的方式来检查Python字符串是否包含所有相同的字符。

检查Python字符串是否包含所有相同字符的不同方法

Set函数

Set函数将帮助我们检查程序输入的字符串之间的相似性。这是一种非常简单的方法，输出将在所有情况下显示为True或False。让我们先看一下语法，然后再通过一个示例来更好地理解它：-

示例

def similarity_in_between_characters(input): # The string is given as input to the function similarity_in_between_characters
   return len(set(input)) == 1 # The length should be the same
# Example
print(similarity_in_between_characters("ffffff"))  # Case - 1
print(similarity_in_between_characters("asffcde")) # Case - 2

输出

上述示例的输出结果如下：-

True # All the characters are same in the first case
False # There are different characters present in the second case

Counter类

在这个方法中，我们将使用collection模块来计算唯一字符的数量，如果超过1个字符，则输出将显示为false。让我们先看一下语法，然后通过一个例子更好地理解它：

示例

from collections import Counter # Do not forget to import the collections library or else error might occur

def similarity_in_between_characters(input):# The string is given as input to the function similarity_in_between_characters
   char_count = Counter(input) # With the help of the counter class, all the characters in the string will be counted
   return len(char_count) == 1 
# Example
print(similarity_in_between_characters("ffffff")) # Case-1 
print(similarity_in_between_characters("asddfc")) # Case-2

输出

上述示例的输出将如下所示：-

True # All the characters are same in the first case
False # There are different characters present in the second case

循环方法

在这种方法中，每个字符将会逐个与其他字符进行比较，如果发现任何差异，则输出将显示为false。让我们先看一下例子以更好地理解所遵循的语法：-

示例

def similarity_in_between_characters(input):# The string is given as input to the function similarity_in_between_characters
   first_char = input[0] # The first character is set as a reference character 
   return all(char == first_char for char in input) # With the help of for loop each charatcer in the string is compared with the first character
# Example
print(similarity_in_between_characters("fffff")) # Case-1 
print(similarity_in_between_characters("fdsas")) # Case-2

输出

上述示例的输出将如下所示：-

True # All the characters are same in the first case
False # There are different characters present in the second case

计数函数

在这种方法中，借助计数函数，对字符串中出现的所有不同字符进行计数。让我们来看一下语法，然后通过一个例子来更好地理解：-

示例

def similarity_in_between_characters(input):# The string is given as input to the function similarity_in_between_characters
   first_char = input[0] # The count of the different characters present in the string is done
   return input.count(first_char) == len(input)
# Example
print(similarity_in_between_characters("fffff")) # Case-1 
print(similarity_in_between_characters("asyew")) # Case-2

输出

上面示例的输出结果如下： –

True # All the characters are same in the first case
False # There are different characters present in the second case

所有函数

借助所有函数的帮助，我们检查输入的字符串中的所有元素是否可以检查，并使用集合函数来检查字符的相似性。让我们来看一下语法和示例，以便更好地理解：

示例

def similarity_in_between_characters(input):# The string is given as input to the function similarity_in_between_characters
   return all(char == input[0] for char in input) # The all function checks if all the elements in the input are iterable and with the help of set function, we check the similarity of the characters present in the input
# Example
print(similarity_in_between_characters("fffff")) # Case-1
print(similarity_in_between_characters("asdda")) # Case-2

输出

上述示例的输出如下：

True # All the characters are same in the first case
False # There are different characters present in the second case

组合的Set & Length函数

这是一种非常简短的编程方法，我们将使用length函数来查找字符串的长度，并借助set函数来检查字符串的字符相似性。让我们看一下语法，然后通过一个示例来更好地理解它：-

示例

def similarity_in_between_characters(input):# The string is given as input to the function similarity_in_between_characters
   return len(set(input)) == 1 # The length of the string is found and then the similarity of the characters is checked and if it remains 1 then the output is given as true
#Example 
print(similarity_in_between_characters("fffff")) # Case-1 
print(similarity_in_between_characters("fsdwa")) # Case-2

输出

以上示例的输出结果如下：

True # All the characters are same in the first case
False # There are different characters present in the second case

最大和集合函数

在此方法中，我们使用max和set函数的组合，首先使用set函数找到唯一字符，然后使用max函数找到输入中的最大字符。如果最大字符和最小字符之间的差是零，则输出将显示为true。让我们看一下语法，然后通过一个示例来更好地理解它：

示例

def similarity_in_between_characters(input): # The string is given as input to the function similarity_in_between_characters
   return len(set(input)) == 1 or max(input) == min(input) # The output will be displayed as true if the maximum characters are equal to the minimum characters or else the output will be false
# Example
print(similarity_in_between_characters("fffff")) # Case-1
print(similarity_in_between_characters("asdwd")) # Case-2

输出

上述示例的输出将如下所示：-

True # All the characters are same in the first case
False # There are different characters present in the second case

结论

学习如何在python中检查字符串是否包含全部相同字符的不同方法是成为高效程序员的必要知识。您可以参考上述文章了解不同的字符相似性检查方法，并根据需要使用其中任何一种。