我从一个csv\u阅读器中逐行读取,并试图转换同一行上的浮点字符串列表。目前,我有:
list([float(i) for i in map(list, csv_reader)])
这显然行不通。我怎样才能达到我想要的?我也希望这一切都在一条线上。你知道吗
我需要两个map
函数吗?可能是两个Pythonic for
循环?你知道吗
我要处理的功能是:
def csv_input(filename):
print(f'Currently reading the annotations from {filename}')
try:
csv_input_file = open(filename, 'rt')
except FileNotFoundError:
program_help()
print("[Error] Input File not found")
csv_reader = csv.reader(csv_input_file, delimiter=',')
unfiltered_annots = list(float(i) for i in map(list, csv_reader))
csv_input_file.close()
return unfiltered_annots
我的CSV文件如下所示:
11, 11, 24, 24, 0.75
10, 11, 20, 20, 0.8
11, 9, 24, 24, 0.7
40, 42, 20, 20, 0.6
我得到的错误是:
Traceback (most recent call last):
File "maximal_supression.py", line 124, in test_google_doc_example
unfiltered_annots = csv_input('example_input.csv')
File "maximal_supression.py", line 34, in csv_input
unfiltered_annots = list(float(i) for i in map(list, csv_reader))
File "maximal_supression.py", line 34, in <genexpr>
unfiltered_annots = list(float(i) for i in map(list, csv_reader))
TypeError: float() argument must be a string or a number, not 'list'
您正在尝试将列表转换为浮动。如果要将list的元素转换为float,还应在list中遍历列表:
unfiltered_annots = list([[float(i) for i in l] for l in map(list, csv_reader)])
在我稍微转换的代码中(为了简单起见):
它返回列表列表:
另外,正如前面提到的,
csv_reader
返回列表,因此您不需要将列表映射到csv\u读取器:unfiltered_annots = [list(map(float, l)) for l in csv_reader]
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