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  • with open("text.txt", 'r') as file:for line in file:line = line.rstrip('\n' + '').split(':')print(line)I am having trouble trying to remove empty lists in the series of arrays that are being generated...

    1586010002-jmsa.png

    with open("text.txt", 'r') as file:

    for line in file:

    line = line.rstrip('\n' + '').split(':')

    print(line)

    I am having trouble trying to remove empty lists in the series of arrays that are being generated. I want to make every line an array in text.txt, so I would have the ability to accurately access each element individually, of each line.

    The empty lists display themselves as [''] - as you can see by the fourth line, I've tried to explicitly strip them out. The empty elements were once filled with new line characters, these were successfully removed using .rstrip('\n').

    Edit:

    I have had a misconception with some terminology, the above is now updated. Essentially, I want to get rid of empty lists.

    解决方案

    Since I can't see your exact line, its hard to give you a solution that matches your requirements perfectly, but if you want to get all the elements in a list that are not empty strings, then you can do this:

    >>> l = ["ch", '', '', 'e', '', 'e', 'se']

    >>> [var for var in l if var]

    Out[4]: ['ch', 'e', 'e', 'se']

    You may also use filter with None or bool:

    >>> filter(None, l)

    Out[5]: ['ch', 'e', 'e', 'se']

    >>> filter(bool, l)

    Out[6]: ['ch', 'e', 'e', 'se']

    If you wish to get rid of lists with empty strings, then for your specific example you can do this:

    with open("text.txt", 'r') as file:

    for line in file:

    line = line.rstrip('\n' + '').split(':')

    # If line is just empty

    if line != ['']:

    print line

    展开全文
  • python除去列表空白元素以及转义字符: res=["a","","b","c","\nab"] 除去列表空白元素,同时去除元素中的转义字符:通过重新构造新列表: res=[i.strip() for i in res if(len(str(i).strip())!=0)] //或者 res=[i....

    python除去列表空白元素以及转义字符:

    res=["a","","b","c","\nab"]
    

    除去列表空白元素,同时去除元素中的转义字符:通过重新构造新列表:

    res=[i.strip() for i in res if(len(str(i).strip())!=0)]
    //或者
    res=[i.strip() for i in res if str(i).strip()!=""]
    
    展开全文
  • with open("text.txt", 'r') as file:for line in file:line = line.rstrip('\n' + '').split(':')print(line)I am having trouble trying to remove empty lists in the series of arrays that are being generated...

    with open("text.txt", 'r') as file:

    for line in file:

    line = line.rstrip('\n' + '').split(':')

    print(line)

    I am having trouble trying to remove empty lists in the series of arrays that are being generated. I want to make every line an array in text.txt, so I would have the ability to accurately access each element individually, of each line.

    The empty lists display themselves as [''] - as you can see by the fourth line, I've tried to explicitly strip them out. The empty elements were once filled with new line characters, these were successfully removed using .rstrip('\n').

    Edit:

    I have had a misconception with some terminology, the above is now updated. Essentially, I want to get rid of empty lists.

    解决方案

    Since I can't see your exact line, its hard to give you a solution that matches your requirements perfectly, but if you want to get all the elements in a list that are not empty strings, then you can do this:

    >>> l = ["ch", '', '', 'e', '', 'e', 'se']

    >>> [var for var in l if var]

    Out[4]: ['ch', 'e', 'e', 'se']

    You may also use filter with None or bool:

    >>> filter(None, l)

    Out[5]: ['ch', 'e', 'e', 'se']

    >>> filter(bool, l)

    Out[6]: ['ch', 'e', 'e', 'se']

    If you wish to get rid of lists with empty strings, then for your specific example you can do this:

    with open("text.txt", 'r') as file:

    for line in file:

    line = line.rstrip('\n' + '').split(':')

    # If line is just empty

    if line != ['']:

    print line

    展开全文
  • 今天小编就为大家分享一篇Python 列表去重去除空字符的例子,具有很好的参考价值,希望对大家有所帮助。一起跟随小编过来看看吧
  • Python去除列表中的空元素

    千次阅读 2019-09-25 00:10:18
    方法1. >>> ls=[' ',1,'w e',4,'','good',' ',''] >>> ls [' ', 1, 'w e', 4, '', 'good', ' ', ''] >>...=''] #去除空元素 >>> ls1 [' ', 1, 'w e', 4, 'go...

    方法1.

    >>> ls=[' ',1,'w e',4,'','good',' ','']
    >>> ls
    [' ', 1, 'w e', 4, '', 'good', ' ', '']
    >>> ls1=[x for x in ls if x!=''] #去除空元素
    >>> ls1
    [' ', 1, 'w e', 4, 'good', ' ']
    >>> ls2=[x for x in ls if x!=' '] #去除单空格元素
    >>> ls2
    [1, 'w e', 4, '', 'good', '']
    >>> ls                           #原列表不变
    [' ', 1, 'w e', 4, '', 'good', ' ', '']
    >>> ls=[x for x in ls if x!='']
    >>> ls
    [' ', 1, 'w e', 4, 'good', ' ']

     

    展开全文
  • 如下所示:# x = ['c b a',"e d f"]# y = []# for i in x:# for ii in i:# # print(ii)# if ii == ' ':# pass# else:# y.append(ii)# print(y)# python 清除列表中的字符# list1 = ['122','2333','3444',' ','422'...
  • python 去除列表重复元素

    千次阅读 2018-06-01 11:40:30
    # 定义一个空列表用于接收不重复的列表元素 dedup_li = list() # 定义一个相关变量,用于下标的判断 index = 0 # 相同的任意个元素,用列表的index方法只能取到第一个重复元素的下标 # 遍历列表,同时每取到一...
  • Python去除List中的空元素

    千次阅读 2019-03-19 14:17:02
    #创建包含空元素的List >>>x = ['a',1,2,'','b','',3] >...#去除空元素 >>>x = [i for i in x if(len(str(i))!=0)] >>>x >['a', 1, 2, 'b', 3] 我们下次再见...
  • python设置变量精确度: 对于浮点数 a=1.36852 a=round(a,2) ...去除列表空元素 有时候input()一个字符串 然后转化为列表(string.split(' '))之后,会有‘’空元素,导致后面出错,需要去掉 list1...
  • python删除列表中所有的空元素 while '' in list: list.remove('') 随机推荐 webbench 压力测试 原文 webbench最多可以模拟3万个并发连接去测试网站的负载能力,个人感觉要比Apache自带的ab压力测试工具好用,安装...
  • 今天在测试数据的时候偶然发现一个问题,如下: ...for的计数器是依次递增的,但列表的内容已通过remove更改,i迭代的值为a ‘’ ‘’ ‘’然后越界,所以,只能删除前三个空元素。 这个问题算是大家非常容易忽略的细
  • Python 列表去重去除空字符

    万次阅读 2017-12-26 15:29:39
    # x = ['c b a',"e d f"] # y = [] # for i in x: # for ii in i: # # print(ii) # if ii == ' ': # pass # else: # y.append(ii) ...# python 清除列表中的字符 # list1 = ['122','2333','3444
  • Python 中删除列表中所有的空元素

    万次阅读 2018-04-29 16:08:55
    Python 中删除列表中所有的空元素 1. 删除None值 mylist = ["asas", "cfdsgfdas", None, "csdfew"] while None in mylist: mylist.remove(None) des = " ".join...
  • python实现删除列表中某个元素的3种方法python中关于删除list中的某个元素,一般有三种方法:remove、pop、del:1.remove: 删除单个元素,删除首个符合条件的元素,按值删除举例说明:>>> str=[1,2,3,4,5,2,6]>>> str....
  • 跟着悟空学python什么是列表官方定义:由一系列按特定顺序排列的元素组成。可以将任何东西加入到列表中。如果你理解不了,看这句话就行---- 列表就是把任何元素按特定的顺序排列在一起的一个表在python中 用 [] 来...
  • 主要介绍了Python如何优雅删除字符列表空字符及None元素,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
  • Python删除空元素

    2021-03-16 20:03:07
    arr_copy = list(filter(None, arr_copy))
  • 前提:有两个列表列表a和列表b,要求去除列表a中所有在列表b中的包含的元素 代码如下: def array_diff(a, b): #定义空列表 c=[] #range(len(a))取的为列表a的索引,根据a的 for i in range(len(a)): #取出...
  • 去除python列表中的重复元素,有很多方法直观方法先建立一个新的空列表,再遍历原来的列表,利用逻辑关系not in 来去重。numbers = [1,7,3,2,5,6,2,3,4,1,5]new_numbers = []for x in numbers:if x not in new_...
  • 特定情况会使用split函数对字符串切割,切割的结果为列表,可能会出现空字符串元素,例如: a = '我再学些pythonpython学起来真的很简单,你有...以逗号切割后,最后一个逗号会称为空元素,这是可以使用 filter...
  • while '' in list: list.remove('') 转载于:https://www.cnblogs.com/z-x-y/p/9792634.html
  • 删除列表中的空元素 本以为挺简单的,一顿操作之后,再加上网上的资料,还有点小复杂。 以案例来说,更清晰些,做个学习笔记。 list_eg = ['',' ','hello','\n','world','\t'] print(list_eg) 输出如下 ['', ' ', '...
  • python – 优雅地删除字符列表中的字符及None元素 在参考资料2中有很好的过程分析,建议看一下。 content=['a','',None,False,'','b','c'] y=list(filter(lambda s: s and s.strip(),content)) print(y) ['a',...
  • python列表去掉最后一个元素

    千次阅读 2018-04-16 17:18:00
    Python3中列表数据类型的内置方法里有三种方法可以删除列表的最后一个元素(我所知道的): 1、pop方法 1 list = [1,2,3,4] 2 list.pop() 3 print(list) 4 5 #[1, 2, 3] 2、del方法 1 list = [1,2,...
  • python列表中的元素进行去重操作

    千次阅读 2019-03-10 23:19:28
    1.案例要求: """ 有列表:["a","a","...要求去除重复的列表数据,达到效果["a","b","c","d","f"] "&q
  • ## 删除列表中的字符 a = ['', '好人','中国人'] b = list(filter(None, a)) print(b) [好人','中国人'] #对列表打乱顺序 >>> b = [1,3,5,7,8] >>> random.shuffle(b) >>> ...
  • 假设在python中有一字典如下:x={... 去除重复元素第1步通过常用的函数eval()就可以做到了,第2步需要添加一个键值并添加元素,第3步利用set集合的性质可以达到去重的效果,不过最后需要再将set集合转化为list列表...
  • Python list列表中删除多个重复元素操作示例本文实例讲述了Python list列表中删除多个重复元素操作。分享给大家供大家参考,具体如下:我们以下面这个list为例,删除其中所有值为6的元素:l=[9,6,5,6,6,7,8,9,6,0]...

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