将浮点数组写入CSV文件

Question

I have a float array (created by: array('f') ) and I want to write its contents as a 1-column CSV file, that is, each element of the array will take one line of the resulting file.

from array import array

my_array = array('f')
with open(filename, 'w') as output:
    my_array = populate_method()
    writer = csv.writer(output)
    print(my_array)  # verifying that the data exist
    writer.writerows(my_array.tolist())

I get this error at the latest line: _csv.Error: sequence expected .
What is wrong? Isn't the list a sequence?

Answer 1

why ... you can just write it

with open("outfile","wb") as f:
     f.write("\n".join(str(x) for x in my_list))

the problem with your original code is that writerows expects a 2d list and you are just giving it a one dimensional list, therfor alternatively you can convert your 1d list into a 1column 2d list with

my_list_i_can_use_with_writerows = zip(*[myList])