Python-将字符串数组转换为浮点数数组的方法
python中的字符串文字被单引号或双引号引起来。使用变量名，后跟等号和字符串的方式为变量分配字符串。您可以使用三个引号将多行字符串分配给变量。
示例
# array of strings to array of floats using astype
import numpy as np
# initialising array
ini_array = np.array(["1.1", "1.5", "2.7", "8.9"])
# printing initial array
print ("initial array", str(ini_array))
# conerting to array of floats
# using np.astype
res = ini_array.astype(np.float)
# printing final result
print ("final array", str(res))
# array of strings to array of floats using fromstring
import numpy as np
# initialising array
ini_array = np.array(["1.1", "1.5", "2.7", "8.9"])
# printing initial array
print ("initial array", str(ini_array))
# conerting to array of floats
# using np.fromstring
ini_array = ', '.join(ini_array)
ini_array = np.fromstring(ini_array, dtype = np.float, sep =', ' )
# printing final result
print ("final array", str(ini_array))
# converting array of strings to array of floats using asarray
import numpy as np
# initialising array
ini_array = np.array(["1.1", "1.5", "2.7", "8.9"])
# printing initial array
print ("initial array", str(ini_array))
# conerting to array of floats
# using np.asarray
final_array = b = np.asarray(ini_array,
dtype = np.float64, order ='C')
# printing final result
print ("final array", str(final_array))输出结果
('initial array', "['1.1' '1.5' '2.7' '8.9']")
('final array', '[ 1.1 1.5 2.7 8.9]')
('initial array', "['1.1' '1.5' '2.7' '8.9']")
('final array', '[ 1.1 1.5 2.7 8.9]')
('initial array', "['1.1' '1.5' '2.7' '8.9']")
('final array', '[ 1.1 1.5 2.7 8.9]')