1. 语法糖@decorator相当于function=decorator(function),在此调用decorator的__init__打印“inside decorator.__init__()” 2. 随后执行f()打印“inside function()” 3. 随后执行“print(“Finished decorating function()”)” 4. 最后在调用function函数时,由于使用装饰器包装,因此执行decorator的__call__打印...
Note python has this really weird error if you define local variable in a function same name as the global variable, program will promptUnboundLocalError. child class object overrides parent class methods input: classfruit:defprint(self):print('a')defeat(self):print('b')classapple(fruit):defpr...
logging.basicConfig(level=logging.INFO,format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')logger=logging.getLogger(__name__)defmain():ts=time()client_id=os.getenv('IMGUR_CLIENT_ID')ifnot client_id:raiseException("Couldn't find IMGUR_CLIENT_ID environment variable!")downlo...
#variable initialization step import pygame as game game.init() color_white = (255,255,255) color_black = (0,0,0) color_red = (255,0,0) #display size display_width = 800 display_height = 600 DisplayScreen = game.display.set_mode((display_width,display_height)) game.display.set_cap...
Inside Function Return, Yield return :此关键字用于从函数返回值。 yield :此关键字与 return 语句类似,但用于返回生成器。 # Return 关键字deffun(): S =0foriinrange(10): S += ireturnSprint(fun())# Yield 关键字deffun(): S =0foriinrange(10): ...
class Animal (object): def __init__ (self, age): --- __init__ was a special method that told Python how to create an object. 'self', which is a variable that we use to refer to any instance of the class. 'age' is going to represent what other data we use to initialize our...
<class 'pandas.io.pytables.HDFStore'> File path: mydata.h5 >>> store.keys() ['/obj1', '/obj2'] 逆操作也很简单。我们来考虑一下包含多种data structure的HDF5文件,可以像下面这样获取里面的object: >>> store["obj2"] up down right left white 0 0.5 1 1.5 black 2 2.5 3 3.5...
import tkinter as tk class App(tk.Frame): def __init__(self, master): super().__init__(master) self.pack() self.entrythingy = tk.Entry() self.entrythingy.pack() # Create the application variable. self.contents = tk.StringVar() # Set it to some value. self.contents.set("this ...
The run() function with the Shell parameter will almost always end up using the Command Prompt. The subprocess module uses the Windows COMSPEC environment variable, which in almost all cases will point to cmd.exe, the Command Prompt. By now, there are so many programs that equate COMSPEC to...
You’ll see that you’ll get a NameError that says that the name 'total' is not defined when you try to print out the local variable total that was defined inside the function body. The init variable, on the other hand, can be printed out without any problems. Anonymous Functions in ...