Why do two identical list to np.array, data types become object, and the other float??

Why do two list-to-np.array, datatypes of exactly the same type become object, and the other floatable!

print(len(X_l)) -sharp 2013
print(len(X_s)) -sharp 1980
print(X_l[0].dtype)  -sharp float64
print(X_s[0].dtype)  -sharp float64
print(X_l[0].shape)  -sharp (384, 448, 1)
print(X_s[0].shape)  -sharp (384, 448, 1)

X_l = np.array(X_l)
X_s = np.array(X_s)

print(type(X_l[0]))  -sharp <class "numpy.ndarray">
print(type(X_s[0]))  -sharp <class "numpy.ndarray">

print(X_l.dtype) -sharp  object
print(X_s.dtype) -sharp  flaot64
print(X_l.shape) -sharp 2013
print(X_s.shape) -sharp 1980, 384, 448, 1

Numpy python

Nov.08,2021

< H2 > is it feasible to use cast < / H2 >

import numpy as np


li1 = [1.0,2.0]
li2 = [1.0,2.0]


li1_1 = np.array(li1)
li2_1 = np.array(li2,dtype=object)

print(li1_1.dtype)
print(li1_1.dtype)
print(type(li1_1))
print(type(li2_1))

print(li1_1.dtype)
print(li2_1.dtype)

-sharp 
li2_1_1 = np.array(li2_1,dtype=float)
print(li2_1_1.dtype)

Previous: WebApp package long Press Save Picture method

Next: How to configure Mini Program to enter Mini Program from a separate subcontract page

I have 30, 000 pictures now. How can I save them in numpy format?
as mentioned above, I am going to save about 30, 000 pictures in numpy format first, so that it will be much more convenient and faster to use later. but in the process of running, it seems that there is an error due to insufficient memory, which is r...

Gpu numpy python

Feb.28,2021
The python that can be executed normally in the interactive environment reports an error in IDE.
1. According to Google s official machine learning course code, there is no problem when executing in an interactive environment, but an error will be reported when executed in vscode; the 2.python code is as follows: import numpy as np np.random.p...

Visual-studio-code numpy python

Mar.01,2021
Random walk question ask why the argmax output will be a lot of 0? It didn't live up to expectations.
this is a basic random walk problem. according to the contents of the book, I try to find indexes on axis=1 whose absolute value is greater than or equal to 7, but there are always several rows whose index is 0, and the index entered normally is fine....

Numpy python

Mar.02,2021
Numpy index exercise, ask for advice
ask God to explain how the results of this a [iMagnej] are all taken out of a. Why do I not understand the meaning expressed by [iMagnej] ? ...

Numpy python

Mar.16,2021
Where do the properties contained in python come from?
for example, numpy, I looked at the package structure of numpy on github and found that numpy is a package, but its _ _ init__.py file does not have a function definition such as ones (), and there is no import reference to it, so why can I write numpy.o...

Numpy python

Mar.24,2021
The sum according to the condition in the matrix?
problem description The matrix is as follows: 1,2017,2,5 1,2018,1,5 1,2018,2,4 2,2017,1,5 1,2018,1,2 according to the first three columns, there are three kinds of matrix to produce a new matrix: 1,2017,2,5 1,2018,1,7 1,2018,2,4 2,2017,1,5 one li...

Numpy python

Mar.28,2021
The solution result of numpy gradient function is inconsistent when the variables are array and matrix.
topic description use the numpy gradient function to calculate the gradient related codes Please paste the code text below (do not replace the code with pictures) g = img [0 3, 0:3] g = array ([[138144141], [134, 135, 132], [137, 1...

Numpy python

Apr.05,2021
Why is the calculation of Fibonacci by numpy matrix method 10 times faster than that of GMP built-in fib function?
didn t GMP say the fastest large number operation library on earth? ...

Numpy python

Aug.17,2021
May I ask how to effectively speed up python multiple nested loops?
involves the calculation of a large amount of data there are multiple loops nested within the use of pandas for calculation extremely slow is there any effective way to speed up? ...

Numpy python pandas

Jul.19,2022

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b36f57-2c039.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b36f57-2c039.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?