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HomeBackend DevelopmentPython TutorialHow to find the maximum and minimum value in an array using numpy

这次给大家带来怎样用numpy找出数组里最大与最小值,用numpy找出数组里最大与最小值的注意事项有哪些,下面就是实战案例,一起来看一下。

python中利用numpy创建一个array, 然后我们想获取array的最大值,最小值。可以使用一下方法:

一、创建数组

这样就可以获得一个array的最大值和最小值了。

并且可以利用np.where(np.max(a))来获得最大值,最小值的行和列数。

二、python下对文件的操作

1、移动一个文件夹到另一个文件夹下

首先

import os, skutil

复制文件:

shutil.copyfile('oldfile', 'newfile')

oldfile和newfile都只能是文件

shutil.copy('oldfile', 'newfile')

oldfile只能是文件夹,newfile可以是文件,也可以是目标目录

复制文件夹:

shutil.copytree('olddir', 'newdir')

olddir和newdir都只能是目录,且newdir必须不存在

移动文件:

shutil.move('oldpos', 'newpos')

重命名文件:

os.rename('oldname', 'newname') 文件和目录都使用这条命令

删除文件:

os.remove('file')
os.rmdir('dir')

只能删除空目录

判断目标:

os.path.exists('goal')

判断目标是否存在

os.path.isdir('goal')

判断目标是否是目录

os.path.isfile('goal')

判断目标是否是文件

转换目录:

os.chdir('path')

判断路径是否存在:

isExists = os.path.exists(path)

存在 True

不存在 False

创建目录:

os.mkdir('file')

创建多层目录:

def mkdirs(path):
# 去除首位空格
path = path.strip()
# 去除尾部 \ 符号
path = path.rstrip('\\')

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