|NO.Z.00027|——————————|BigDataEnd|——|Hadoop&Python.v05|——|Arithmetic.v05|NumPy科学计算库：NumPy数据类型|

一、数据类型

### --- ndarray的数据类型：

int: int8、uint8、int16、int32、int64
float: float16、float32、float64
str

### --- array创建时，指定

import numpy as np
np.array([1,2,5,8,2],dtype = 'float32')
# 输出 ：array([1., 2., 5., 8., 2.], dtype=float32)

### --- asarray转换时指定

import numpy as np
arr = [1,3,5,7,2,9,0]
# asarray 将列表进⾏变换
np.asarray(arr,dtype = 'float32')
# 输出：array([1., 3., 5., 7., 2., 9., 0.], dtype=float32)

### --- 数据类型转换astype

import numpy as np
arr = np.random.randint(0,10,size = 5,dtype = 'int16')
# 输出：array([6, 6, 6, 6, 3], dtype=int16)
# 使⽤astype进⾏转换
arr.astype('float32')                                   # 输出：array([1., 4., 0., 6., 6.], dtype=float32)

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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