


How 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。
在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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