Python如何从字符串列表中删除空字符串（）

在许多情况下, 我们会遇到在大量数据中获取空字符串并处理有时变得乏味的问题。让我们讨论一些从字符串列表中删除空字符串的方法。
方法1：使用remove()
此特定方法非常幼稚, 不建议使用, 但实际上是执行此任务的方法。去掉()通常会删除第一次出现的空字符串, 并且我们会重复进行此过程, 直到在列表中找不到空字符串为止。

# Python3 code to demonstrate # removing empty strings # using remove()# initializing list test_list = [" ", " lsbin ", " ", " is ", " best ", " "]# Printing original list print ( "Original list is : " + str (test_list))# using remove() to # perform removal while ("" in test_list) : test_list.remove("")# Printing modified list print ( "Modified list is : " + str (test_list))

【Python如何从字符串列表中删除空字符串（）】输出如下：

Original list is : ['', 'lsbin', '', 'is', 'best', ''] Modified list is : ['lsbin', 'is', 'best']

方法2：使用列表理解
更简洁, 更好的方法是删除所有空字符串, 它只是检查字符串是否不为空, 然后使用所有不为空的字符串重新创建列表。

# Python 3 code to demonstrate # removing empty strings # using list comprehension# initializing list test_list = [" ", " lsbin ", " ", " is ", " best ", " "]# Printing original list print ( "Original list is : " + str (test_list))# using list comprehension to # perform removal test_list = [i for i in test_list if i]# Printing modified list print ( "Modified list is : " + str (test_list))

输出如下：

Original list is : ['', 'lsbin', '', 'is', 'best', ''] Modified list is : ['lsbin', 'is', 'best']

方法3：使用join() + split()
结合join()和split()操作，也可以实现此任务。我们首先连接所有的字符串以删除空字符串，然后将其分割回列表，这样创建的新列表中就没有空字符串了。

# Python3 code to demonstrate # removing empty strings # using join() +split()# initializing list test_list = [" ", " lsbin ", " ", " is ", " best ", " "]# Printing original list print ( "Original list is : " + str (test_list))# using join() +split() to # perform removal test_list = ' ' .join(test_list).split()# Printing modified list print ( "Modified list is : " + str (test_list))

输出如下：

Original list is : ['', 'lsbin', '', 'is', 'best', ''] Modified list is : ['lsbin', 'is', 'best']

方法4：使用filter()
使用filter()是执行此任务的最优雅和最快的方法。这种方法是强烈推荐的，因为当我们处理可能包含空字符串的大型机器学习数据集时，速度很重要。

# Python 3 code to demonstrate # removing empty strings # using filter()# initializing list test_list = [" ", " lsbin ", " ", " is ", " best ", " "]# Printing original list print ( "Original list is : " + str (test_list))# using filter() to # perform removal test_list = list ( filter ( None , test_list))# Printing modified list print ( "Modified list is : " + str (test_list))

输出如下：