Python 对txt文件中的数据进行分组时遇到问题

我是一个初级程序员，我的项目需要我对文本文件进行分类。 我打开的txt文件如下所示： （这并不是txt文件的完整外观，只是当我复制并通过它时，它看起来太凌乱了。因为某种原因，只有另一列刚刚填充了“map”一词）

我希望输出如下：

MAG     UTC DATE-TIME             LAT         LON      DEPTH    Region
4.3    2014/03/12 20:16:59       25.423     -109.730   10.0     GULF OF CALIFORNIA
5.2    2014/03/12 20:09:55       36.747      144.050   24.2     JAPAN
5.0    2014/03/12 20:08:25       35.775      141.893   24.5     JAPAN
4.8    2014/03/12 19:59:01       38.101      142.840   17.6     Japan
4.6    2014/03/12 19:55:28       37.400      142.384   24.7     JAPAN
5.0    2014/03/12 19:45:19       -6.187      154.385   62.0     GUINEA

[日本，'4.3'，'5.2'，'5.0'，'4.8'，'4.6']，[加利福尼亚湾，4.3'，[几内亚，5.0]]

我当前的编码： （第一个for循环中的vlist[7:]给出了区域名称，第二个for循环中的j[1]给出了magtitude编号。）

给出了以下内容的输出：

[[日本，'4.3']，[加利福尼亚湾，4.3]，[几内亚，5.0]]

---

我想知道为什么它只得到其他区域出现的第一个震级数，而不是其他区域。

给你：使用

itertools.groupby

，

lambda

，

map

，

str.split

，

str.lower

和

str.join

如果您的文件如下所示：

MAG     UTC DATE-TIME             LAT         LON      DEPTH    Region
4.3    2014/03/12 20:16:59       25.423     -109.730   10.0     GULF OF CALIFORNIA
5.2    2014/03/12 20:09:55       36.747      144.050   24.2     JAPAN
5.0    2014/03/12 20:08:25       35.775      141.893   24.5     JAPAN
4.8    2014/03/12 19:59:01       38.101      142.840   17.6     Japan
4.6    2014/03/12 19:55:28       37.400      142.384   24.7     JAPAN
5.0    2014/03/12 19:45:19       -6.187      154.385   62.0     GUINEA

以下是工作代码：

>>> import itertools
>>> f = open('file.txt')
>>> [[" ".join(x),list(map(lambda z:z[0],list(y)))] for x,y in itertools.groupby(sorted(list(map(str.split,map(str.lower,list(f)[1:]))),key=lambda x:" ".join(x[6:])),key=lambda x:x[6:])]
[['guinea', ['5.0']], ['gulf of california', ['4.3']], ['japan', ['5.2', '5.0', '4.8', '4.6']]]

让我解释一下：

>>> f = open('file.txt')
>>> k = list(map(str.lower,list(f)[1:]))  # convert all lines to lower case and leave 1st line
>>> k
['4.3    2014/03/12 20:16:59       25.423     -109.730   10.0     gulf of california\n', '5.2    2014/03/12 20:09:55       36.747      144.050   24.2     japan\n', '5.0    2014/03/12 20:08:25       35.775      141.893   24.5     japan\n', '4.8    2014/03/12 19:59:01       38.101      142.840   17.6     japan\n', '4.6    2014/03/12 19:55:28       37.400      142.384   24.7     japan\n', '5.0    2014/03/12 19:45:19       -6.187      154.385   62.0     guinea\n']
>>> k = list(map(str.split,k))   # it will split the lines on whitespaces
>>> k
[['4.3', '2014/03/12', '20:16:59', '25.423', '-109.730', '10.0', 'gulf', 'of', 'california'], ['5.2', '2014/03/12', '20:09:55', '36.747', '144.050', '24.2', 'japan'], ['5.0', '2014/03/12', '20:08:25', '35.775', '141.893', '24.5', 'japan'], ['4.8', '2014/03/12', '19:59:01', '38.101', '142.840', '17.6', 'japan'], ['4.6', '2014/03/12', '19:55:28', '37.400', '142.384', '24.7', 'japan'], ['5.0', '2014/03/12', '19:45:19', '-6.187', '154.385', '62.0', 'guinea']] 
>>> k = sorted(k,key = lambda x:" ".join(x[6:]))  # it will sort the k on Region
>>> k
[['5.0', '2014/03/12', '19:45:19', '-6.187', '154.385', '62.0', 'guinea'], ['4.3', '2014/03/12', '20:16:59', '25.423', '-109.730', '10.0', 'gulf', 'of', 'california'], ['5.2', '2014/03/12', '20:09:55', '36.747', '144.050', '24.2', 'japan'], ['5.0', '2014/03/12', '20:08:25', '35.775', '141.893', '24.5', 'japan'], ['4.8', '2014/03/12', '19:59:01', '38.101', '142.840', '17.6', 'japan'], ['4.6', '2014/03/12', '19:55:28', '37.400', '142.384', '24.7', 'japan']]
>>> [[" ".join(x),list(map(lambda z:z[0],list(y)))] for x,y in itertools.groupby(k,key = lambda x:x[6:])]
[['guinea', ['5.0']], ['gulf of california', ['4.3']], ['japan', ['5.2', '5.0', '4.8', '4.6']]]

---

你查过我的密码了吗？？

>>> f = open('file.txt')
>>> k = list(map(str.lower,list(f)[1:]))  # convert all lines to lower case and leave 1st line
>>> k
['4.3    2014/03/12 20:16:59       25.423     -109.730   10.0     gulf of california\n', '5.2    2014/03/12 20:09:55       36.747      144.050   24.2     japan\n', '5.0    2014/03/12 20:08:25       35.775      141.893   24.5     japan\n', '4.8    2014/03/12 19:59:01       38.101      142.840   17.6     japan\n', '4.6    2014/03/12 19:55:28       37.400      142.384   24.7     japan\n', '5.0    2014/03/12 19:45:19       -6.187      154.385   62.0     guinea\n']
>>> k = list(map(str.split,k))   # it will split the lines on whitespaces
>>> k
[['4.3', '2014/03/12', '20:16:59', '25.423', '-109.730', '10.0', 'gulf', 'of', 'california'], ['5.2', '2014/03/12', '20:09:55', '36.747', '144.050', '24.2', 'japan'], ['5.0', '2014/03/12', '20:08:25', '35.775', '141.893', '24.5', 'japan'], ['4.8', '2014/03/12', '19:59:01', '38.101', '142.840', '17.6', 'japan'], ['4.6', '2014/03/12', '19:55:28', '37.400', '142.384', '24.7', 'japan'], ['5.0', '2014/03/12', '19:45:19', '-6.187', '154.385', '62.0', 'guinea']] 
>>> k = sorted(k,key = lambda x:" ".join(x[6:]))  # it will sort the k on Region
>>> k
[['5.0', '2014/03/12', '19:45:19', '-6.187', '154.385', '62.0', 'guinea'], ['4.3', '2014/03/12', '20:16:59', '25.423', '-109.730', '10.0', 'gulf', 'of', 'california'], ['5.2', '2014/03/12', '20:09:55', '36.747', '144.050', '24.2', 'japan'], ['5.0', '2014/03/12', '20:08:25', '35.775', '141.893', '24.5', 'japan'], ['4.8', '2014/03/12', '19:59:01', '38.101', '142.840', '17.6', 'japan'], ['4.6', '2014/03/12', '19:55:28', '37.400', '142.384', '24.7', 'japan']]
>>> [[" ".join(x),list(map(lambda z:z[0],list(y)))] for x,y in itertools.groupby(k,key = lambda x:x[6:])]
[['guinea', ['5.0']], ['gulf of california', ['4.3']], ['japan', ['5.2', '5.0', '4.8', '4.6']]]