Python 中检查字符串是否包含所有相同字符的方法

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Python 是一种非常常用的编程语言，用于各种目的，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，我们将学习在 Python 中检查字符串是否包含所有相同字符的不同方法。

Python 中检查字符串是否包含所有相同字符的不同方法

集合函数

集合将帮助我们检查程序中给定的输入字符串之间的相似性。这是一种非常简单的方法，并且在所有情况下输出都将显示为 True 或 False。让我们看一下语法，并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

上面示例的输出如下：-

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

计数器类

在这种方法中，我们将使用 collections 模块来计算唯一字符的数量，如果计数超过 1 个字符，则输出将显示为 false。让我们看一下语法，并通过一个示例来更好地理解它：-

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

上面示例的输出如下：-

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

循环方法

在这种方法中，每个字符将逐个与其他字符进行比较，就像循环形式一样，如果发现任何差异，则输出将显示为 false。让我们看一下语法，并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
   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

上面示例的输出如下：-

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

计数函数

在这种方法中，借助 count 函数，对字符串中出现的所有不同字符进行计数。让我们看一下语法，并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
   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

上面示例的输出如下：-

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

all 函数

借助 all 函数，我们检查给定输入字符串中的所有元素是否都可以被检查，然后借助 set 函数，我们检查字符的相似性。让我们看一下语法，并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 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

上面示例的输出如下：-

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

集合和长度函数的组合

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 函数来检查字符串字符的相似性。让我们看一下语法，并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

上面示例的输出如下：-

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

max 和集合函数

在这种方法中，我们使用 max 和 set 函数的组合，首先借助 set 函数找到唯一字符，然后借助 max 函数找到给定输入中的最大字符。如果最大和最小字符之间的差为零，则输出将显示为 true。让我们看一下语法，并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

上面示例的输出如下：-

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

结论

要成为一名高效的程序员，有必要了解在 Python 中检查字符串是否包含所有相同字符的不同方法。可以参考本文来了解检查字符之间相似性的不同方法，并可以根据需要使用其中的任何一种。