Python –字符的连续重复

有时，在处理字符列表时，我们可能会遇到需要连续重复字符的问题。这可以在许多领域中应用。让我们讨论可以执行此任务的某些方式。

方法#1：使用列表推导
这是可以执行此任务的方式之一。在这种情况下，我们执行一种蛮力的方式来执行，但是通过将每个字符乘以大小来单行执行。

# Python3 code to demonstrate working of 
# Consecutive Repetition of  Characters
# Using list comprehension
  
# initializing list
test_list = ['g', 'f', 'g', 'i', 's', 'b', 'e', 's', 't']
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing K 
K = 3
  
# Consecutive Repetition of  Characters
# Using list comprehension
res = [sub for ele in test_list for sub in [ele] * K]
  
# printing result 
print("The list after Consecutive Repetition is : " + str(res)) 

输出 ：

The original list is : [‘g’, ‘f’, ‘g’, ‘i’, ‘s’, ‘b’, ‘e’, ‘s’, ‘t’]
The list after Consecutive Repetition is : [‘g’, ‘g’, ‘g’, ‘f’, ‘f’, ‘f’, ‘g’, ‘g’, ‘g’, ‘i’, ‘i’, ‘i’, ‘s’, ‘s’, ‘s’, ‘b’, ‘b’, ‘b’, ‘e’, ‘e’, ‘e’, ‘s’, ‘s’, ‘s’, ‘t’, ‘t’, ‘t’]

方法#2：使用chain() + repeat()
上述功能的组合可以用来解决这个问题。在此，我们使用repeat() 执行重复任务，并使用chain() 执行结果构造。

# Python3 code to demonstrate working of 
# Consecutive Repetition of  Characters
# Using chain() + repeat()
from itertools import chain, repeat
  
# initializing list
test_list = ['g', 'f', 'g', 'i', 's', 'b', 'e', 's', 't']
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing K 
K = 3
  
# Consecutive Repetition of  Characters
# Using chain() + repeat()
res = list(chain.from_iterable(repeat(chr, K) for chr in test_list))
  
# printing result 
print("The list after Consecutive Repetition is : " + str(res)) 

输出 ：

The original list is : [‘g’, ‘f’, ‘g’, ‘i’, ‘s’, ‘b’, ‘e’, ‘s’, ‘t’]
The list after Consecutive Repetition is : [‘g’, ‘g’, ‘g’, ‘f’, ‘f’, ‘f’, ‘g’, ‘g’, ‘g’, ‘i’, ‘i’, ‘i’, ‘s’, ‘s’, ‘s’, ‘b’, ‘b’, ‘b’, ‘e’, ‘e’, ‘e’, ‘s’, ‘s’, ‘s’, ‘t’, ‘t’, ‘t’]