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Legal StudiesPython - 把字符串数组转换为浮点数数组的方法
python 中的字符串常量会被单引号或双引号包围。给变量赋值字符串需要在变量名后加上一个等号和字符串。通过使用三个引号，可以给变量赋值多行字符串。
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
('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]')
更新于: 06-8 月-2020
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