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已关闭8年。
我有一个类似于以下文件:
1 a
1 a
1 b
3 s
3 p
3 s
3 y
5 b
...
我正在将其放入键为0列且值为1列的字典中。我正在使用循环，因此当我再次看到键
时，如果新值不在现有键中，则追加新值，因此我的字典看起来像:
test_dict = {'1':[1，b]，'3':[s，p，y] ...}
我的代码如下:
test_dict = {}
with open('file.txt') as f:
for line in f:
column = line.split()
if column[0] not in test_dict:
test_dict[column[0]] = column[3]
elif column[3] not in test_dict[column[0]]:
test_dict[column[0]].append(column[3])
else:
break
我在附加行上得到了
str has no attribute append error。我知道这些列被视为一个字符串，如何在我的代码中对此进行更正？
您不能追加到字符串。您要么要做+=，要么制作test_dict列表的元素。您也可以将dict值设为set，并摆脱所有重复检查的麻烦，尽管您的列表将不再按照首次出现的顺序进行排序。
from collections import defaultdict
test_dict = defaultdict(set)
with open('file.txt') as f:
for line in f:
columns = line.split()
test_dict[columns[0]].add(columns[3])