Mismatch between array dtype ('<U18') and format specifier ('%.18e')

string格式写到.csv文件出现

Mismatch between array dtype ('<U18') and format specifier ('%.18e')

报错

原码：np.savetxt('./filename.csv', fileNames, delimiter=',')

修改后：np.savetxt('./filename.csv', fileNames, delimiter=',',fmt = '%s')

加上fmt = ‘%s’指明类型即可