numpy库常用方法

Author: Snailclimb

PythonDemo/.spyproject/codestyle.ini

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+[codestyle]
+indentation = True
+
+[main]
+version = 0.1.0
+

PythonDemo/.spyproject/encoding.ini

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+[encoding]
+text_encoding = utf-8
+
+[main]
+version = 0.1.0
+

PythonDemo/.spyproject/vcs.ini

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+[vcs]
+use_version_control = False
+version_control_system = 
+
+[main]
+version = 0.1.0
+

PythonDemo/.spyproject/workspace.ini

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+[workspace]
+restore_data_on_startup = True
+save_data_on_exit = True
+save_history = True
+save_non_project_files = False
+
+[main]
+version = 0.1.0
+recent_files = ['C:\\Users\\Administrator\\.spyder-py3\\temp.py', 'C:\\Users\\Administrator\\Desktop\\PythonDemo\\test.py', 'C:\\Users\\Administrator\\Desktop\\PythonDemo\\test2.py', 'D:\\Anaconda3\\lib\\site-packages\\ncmbot\\core.py', 'D:\\Anaconda3\\lib\\site-packages\\psutil\\__init__.py']
+

PythonDemo/numpy/arraymethod.py

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+# -*- coding: utf-8 -*-
+"""
+Created on Mon Mar 12 14:51:47 2018
+
+@author: Administrator
+@description： numpy库操纵数组的一些方法
+"""
+import numpy as np
+
+from numpy.matlib import randn
+#定义数组类型
+arr3 = np.array([1, 2, 3], dtype=np.float64)   
+arr4 = np.array([1, 2, 3], dtype=np.int32)   
+print(arr3.dtype)#float64
+print(arr4.dtype)#int32 
+#转换数组类型
+arr5 = np.array([1, 2, 3, 4, 5])   
+print(arr5.dtype) #int32  
+arr6 = arr5.astype(np.float64) #将数组5的数据类型转换为float64  
+print(arr6.dtype) #float64 
+#数组间以及数组与数之间的运算 
+arr = np.array([[1., 2., 3.], [4., 5., 6.]])   
+print(arr * arr) #相应元素相乘，输出为[[1. 4. 9.] [16. 25. 36.]]  
+print(arr - arr) #相应元素相减，输出为[[0. 0. 0.] [0. 0. 0.]] 
+#创建二维数组，取值，修改值
+arr2d = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])    
+print(arr2d[2]) #数组标号从0开始，输出第三行元素：[7 8 9]  
+#创建三维数组  
+arr3d = np.array([[[1, 2, 3], [4, 5, 6]], [[7, 8, 9], [10, 11, 12]]]) #2个二维数组  
+old_values = arr3d[0].copy() #将第1个二维数组拷贝至old_values   
+print(old_values) #输出：[[1 2 3], [4 5 6]]
+arr3d[0] = 3 #将第1个二维数组的元素都修改为3  
+arr3d[1] = 3 #将第2个二维数组的元素都修改为3
+print(arr3d) #输出全为3的三维数组 
+  

PythonDemo/numpy/creatArray.py

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+# -*- coding: utf-8 -*-
+"""
+Created on Mon Mar 12 14:13:32 2018
+
+@author: Snailclimb
+@description： numpy库创建数组的一些方法
+"""
+import numpy as np
+
+print("创建一维数组：")
+data1 = [3, 3.3, 9, 5, 6]
+arr1 = np.array(data1)
+print(arr1)
+
+print("创建二维数组:")
+data2 = [[1, 2, 3, 4], [5, 6, 7, 8]]   
+arr2 = np.array(data2)   
+print(arr2)   
+ # Type of data in array.   
+print("输出第一个数组的数据类型:",arr1.dtype)   
+print("输出第二个数组的维数:",arr2.ndim)  
+print("输出第三个数组的形状:",arr2.shape)  
+#用zeros函数创建数组  
+print("np.zeros(10)创建10个元素都是0的一维数组： ")
+print(np.zeros(10))
+print("np.zeros((3, 6))创建3行6列都是0的二维数组：")
+print(np.zeros((3, 6)))
+#用Empty函数创建数组，其初始值为乱值  
+print("np.empty((3,6))创建3行6列都是0的二维数组：")
+print(np.empty((3,6))) 
+#用arrange函数创建数组  
+print("np.arange(9)创建一维数组：")
+print(np.arange(9))

PythonDemo/test.py

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+# -*- coding: utf-8 -*-
+
+'''
+Created on 2018年1月21日
+
+@author: Administrator
+'''
+# drawtree.py
+ 
+from turtle import Turtle
+
+ 
+def tree(plist, l, a, f):
+    """ plist is list of pens
+    l is length of branch
+    a is half of the angle between 2 branches
+    f is factor by which branch is shortened
+    from level to level."""
+    if l > 5:  #
+        lst = []
+        for p in plist:
+            p.forward(l)  # 沿着当前的方向画画Move the turtle forward by the specified distance, in the direction the turtle is headed.
+            q = p.clone()  # Create and return a clone of the turtle with same position, heading and turtle properties.
+            p.left(a)  # Turn turtle left by angle units
+            q.right(a)  # turn turtle right by angle units, nits are by default degrees, but can be set via the degrees() and radians() functions.
+            lst.append(p)  # 将元素增加到列表的最后
+            lst.append(q)
+        tree(lst, l * f, a, f)
+            
+ 
+def main():
+    p = Turtle()
+    p.color("green")
+    p.pensize(5)
+    # p.setundobuffer(None)
+    p.hideturtle()  # Make the turtle invisible. It’s a good idea to do this while you’re in the middle of doing some complex drawing,
+    # because hiding the turtle speeds up the drawing observably.
+    # p.speed(10)
+   # p.getscreen().tracer(1,0)#Return the TurtleScreen object the turtle is drawing on.
+    p.speed(10)
+    # TurtleScreen methods can then be called for that object.
+    p.left(90)  # Turn turtle left by angle units. direction 调整画笔
+ 
+    p.penup()  # Pull the pen up – no drawing when moving.
+    p.goto(0, -200)  # Move turtle to an absolute position. If the pen is down, draw line. Do not change the turtle’s orientation.
+    p.pendown()  # Pull the pen down – drawing when moving. 这三条语句是一个组合相当于先把笔收起来再移动到指定位置，再把笔放下开始画
+    # 否则turtle一移动就会自动的把线画出来
+ 
+    # t = tree([p], 200, 65, 0.6375)
+    t = tree([p], 200, 65, 0.6375)
+
+     
+main()

PythonDemo/test2.py

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+# -*- coding: utf-8 -*-
+
+print("sss")
+import psutil
+print(psutil.cpu_count()) # CPU逻辑数量
+print(psutil.cpu_times())  #统计CPU的用户／系统／空闲时间：