[英]How do I write a float list of lists to file in Python
I need to write a series of matrices out to a plain text file from python. 我需要从python中写一系列矩阵到纯文本文件。 All my matricies are in float format so the simple file.write() and file.writelines() 我的所有matricies都是浮点格式,所以简单的file.write()和file.writelines()
do not work. 不工作。 Is there a conversion method I can employ that doesn't have me looping through all the lists (matrix = list of lists in my case) converting the individual values? 有没有我可以使用的转换方法,我没有循环遍历所有列表(矩阵=我的情况下的列表列表)转换单个值?
I guess I should clarify, that it needn't look like a matrix, just the associated values in an easy to parse list, as I will be reading in later. 我想我应该澄清一下,它不需要看起来像一个矩阵,只需要一个易于解析的列表中的相关值,我将在稍后阅读。 All on one line may actually make this easier! 所有在一条线上实际上可以使这更容易!
m = [[1.1, 2.1, 3.1], [4.1, 5.1, 6.1], [7.1, 8.1, 9.1]]
file.write(str(m))
If you want more control over the format of each value: 如果您想要更多地控制每个值的格式:
def format(value):
return "%.3f" % value
formatted = [[format(v) for v in r] for r in m]
file.write(str(formatted))
the following works for me: 以下为我工作:
with open(fname, 'w') as f:
f.writelines(','.join(str(j) for j in i) + '\n' for i in matrix)
import pickle
# write object to file
a = ['hello', 'world']
pickle.dump(a, open('delme.txt', 'wb'))
# read object from file
b = pickle.load(open('delme.txt', 'rb'))
print b # ['hello', 'world']
At this point you can look at the file 'delme.txt' with vi 此时,您可以使用vi查看文件'delme.txt'
vi delme.txt
1 (lp0
2 S'hello'
3 p1
4 aS'world'
5 p2
6 a.
for row in matrix: file.write(" ".join(map(str,row))+"\\n") 对于矩阵中的行:file.write(“”。join(map(str,row))+“\\ n”)
This works for me... and writes the output in matrix format 这对我有用......并以矩阵格式写出输出
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