Here's a fun project attempting to explain what exactly is happening under the hood for some counter-intuitive snippets and lesser-known features in Python.While some of the examples you see below may not be WTFs in the truest sense, but they'll reveal some of the interesting parts of ...
What is the output of the following python program?def myFun(x): x = x +1return xx = 10 x = x+1 myFun(x) x = x+2 print(x) a) 10 b) 11 c)*13 d) 14 相关知识点: 试题来源: 解析 c)13 1. 定义函数myFun(x),将参数x加1后返回。2. 主程序中,x初始化为10。3. 执行x ...
deffoo():print("foo")defbar(func): func() bar(foo) 下面进入什么是装饰器范畴: 其本质上也是一个Python函数或者类,它可以让其他函数或者类在不需要做任何代码修改的前提下增加额外功能 装饰器的返回值也是一个函数或者是类的对象。他经常用于有切面需求的场景 比如说插入日志 性能测试,事务处理,缓存 权限。...
class Weight: def __init__(self, kilos): self.kilos = kilos @classmethod def from_pounds(cls, pounds): # convert pounds to kilos kilos = pounds / 2.205 # cls is the same as Weight. calling cls(kilos) is the same as Weight(kilos) return cls(kilos)...
以下关键字不能声明为变量名['and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else', 'except', 'exec', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'not', 'or', 'pass', 'print', 'raise', 'return',...
False>>>WTF()isWTF()# 也不相同 False>>>hash(WTF())==hash(WTF())# 哈希值也应该不同 True>>>id(WTF())==id(WTF())True 说明:当调用 id 函数时,Python 创建了一个WTF类的对象并传给id函数,然后id函数获取其 id 值(也就是内存地址),然后丢弃该对象,该对象就被销毁了。
The main thing you'll pretty much always see in a__init__method, is assigning to attributes. This is our newPointclass classPoint:"""2-dimensional point."""def__init__(self,x,y):self.x=xself.y=y If we call it like before without any arguments, we'll see an error because this...
Python's Global Interpreter Lock or GIL, in simple words, is a mutex (or a lock) that allows only one thread to hold the control of the Python interpreter at any one time. In this article you'll learn how the GIL affects the performance of your Python pr
python setup.py build_ext -ipython -c 'import seqpy; print(seqpy.revcomp("GGGTT"))' VOTE Amin TabibzadaFollow I don't know if it's the fastest, but the following provides an approximately 10x speed up over your functions: import stringtab = string.maketr...
Tokens in Python are the smallest unit in the program that represents a keyword, operator, identifier, or literal. Know the types of tokens and tokenizing elements.