Python – 从给定的字符串中去除前后标点符号

给定一个字符串带前后标点符号。

Input : test_str = ‘%$Gfg is b!!est(*^’
Output : Gfg is b!!est
Explanation : Front and rear punctuations are stripped.

Input : test_str = ‘%Gfg is b!!est(*^’
Output : Gfg is b!!est
Explanation : Front and rear punctuations are stripped.

方法＃1：使用标点符号（）+循环

在此，我们使用 punctuation() 来检查标点符号，从后面和前面，一次，找到非 pnc char，记录索引并拆分字符串。

Python3

# Python3 code to demonstrate working of 
# Strip Punctuations from String 
# Using loop + punctuation
from string import punctuation
  
# initializing string
test_str = '%$Gfg is b !! est(*^&*'
  
# printing original string
print("The original string is : " + str(test_str))
  
# getting first non-pnc idx 
frst_np = [idx for idx in range(len(test_str)) if test_str[idx] not in punctuation][0]
  
# getting rear non-pnc idx
rear_np = [idx for idx in range(len(test_str) - 1, -1, -1) if test_str[idx] not in punctuation][0]
  
# spittd string 
res = test_str[frst_np : rear_np + 1]
  
# printing result 
print("The stripped string : " + str(res))

输出

The original string is : %$Gfg is b!!est(*^&*
The stripped string : Gfg is b!!est

方法 #2：使用 strip() + split() + join()

在此，我们使用 split() 执行拆分任务，以获取单个单词，strip() 用于删除标点符号。最后 join() 用于执行单词的连接。

Python3

# Python3 code to demonstrate working of 
# Strip Punctuations from String 
# Using strip() + split() + join()
from string import punctuation
  
# initializing string
test_str = '%$Gfg is b !! est(*^&*'
  
# printing original string
print("The original string is : " + str(test_str))
  
# strip is used to remove rear punctuations
res = ' '.join([ele.strip(punctuation) for ele in test_str.split()])
  
# printing result 
print("The stripped string : " + str(res)) 

输出

The original string is : %$Gfg is b!!est(*^&*
The stripped string : Gfg is b!!est