Python – 从元组的第一个元素中删除给定的字符

给定一个元组列表，从元组的第一个元素中删除 K 个字符。

Input : test_list = [(“GF$g!”, 5), (“!i$s”, 4), (“best!$”, 10)], K = ‘$’
Output : [(‘GFg!’, 5), (‘!is’, 4), (‘best!’, 10)]
Explanation : First element’s strings K value removed.

Input : test_list = [(“GF$g!”, 5), (“best!$”, 10)], K = ‘$’
Output : [(‘GFg!’, 5), (‘best!’, 10)]
Explanation : First element’s strings K value removed.

方法 #1：使用 replace() + 列表推导

在此，我们使用 replace() 执行删除 K字符的任务，并使用列表理解来改造元组。

Python3

# Python3 code to demonstrate working of 
# Remove K character from first element of Tuple
# Using replace() + list comprehension
  
# initializing list
test_list = [("GF ! g !", 5), ("! i ! s", 4), ("best !!", 10)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing K 
K = "!"
  
# replace with empty string removes the desired char.
res = [(sub[0].replace(K, ''), sub[1]) for sub in test_list]
  
# printing result 
print("The filtered tuples : " + str(res))

输出

The original list is : [('GF!g!', 5), ('!i!s', 4), ('best!!', 10)]
The filtered tuples : [('GFg', 5), ('is', 4), ('best', 10)]

方法 #2：使用 translate() + 列表理解

在此，我们使用 translate() 执行删除任务，需要使用 ord() 转换为 ascii，并替换为空字符。

Python3

# Python3 code to demonstrate working of 
# Remove K character from first element of Tuple
# Using translate() + list comprehension
  
# initializing list
test_list = [("GF ! g !", 5), ("! i ! s", 4), ("best !!", 10)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing K 
K = "!"
  
# translation after conversion to ascii number 
res = [(sub[0].translate({ord(K): None}), sub[1]) for sub in test_list]
  
# printing result 
print("The filtered tuples : " + str(res))

输出

The original list is : [('GF!g!', 5), ('!i!s', 4), ('best!!', 10)]
The filtered tuples : [('GFg', 5), ('is', 4), ('best', 10)]