python3全栈开发-面向对象、面向过程 一. 什么是面向对象的程序设计及为什么要有它 1.面向过程 面向过程的程序设计:核心是过程二字,过程指的是解决问题的步骤,即先干什么再干什么...面向过程的设计就好比精心设计好一条流水线,是一种 ... PHP面向对象和面向过程 编程界不论是PHP.Python都有这么两种编程思想,oo...
python中的main函数使用if __name__ == '__main__':开始 if __name__ == '__main__': print("hello python") 1. 2. 运行结果: 二、数据类型 在使用数据类型之前,先来了解下python中的注释: 单行注释:#内容多行注释:'''内容'''或"""内容""" 1. 整型 表示一个整数: if __name__ == '...
The__main__indicates the name of an environment specified as "top-level scope" that executes all the top-level code. In Python, the "Top-level code" is the first user-specified module that triggers the execution of the program. The term "top-level" indicates it imports other Python modu...
A Program written in languages of C family (C, C++, Java, C# etc.) needs the main() function to indicate the starting point of execution. In Python, on the other hand, there is no concept of the main() function, as it is an interpreter based language and can be equally used in ...
python print_hello.py in if __name__ == \“__main__\” block 如果用python来执行该文件,那么in if __name__ == “__main__” 条件就会满足,就会打印出 in if __name__ == “__main__” block语句。但是如果将print_hello.py文件当作module导入,情况如下:>>>from print_hello import ...
Python programmers have developed a set of good practices to use when you want to develop reusable code. Now you’re ready to go write some awesome Pythonmain()function code! Take the Quiz:Test your knowledge with our interactive “Defining Main Functions in Python” quiz. You’ll receive a...
受限于题目字数要求。正确题目应该是Python中if __name__ == '__main__',__init__和self 的解析。 也就是说,主要包括2部分内容,分别是if __name__ == '__main__'的解析和__init__与self的解析。 1、if __name__ == '__main__'
(cd /Users/matt/.pyenv/versions/2.7.18/share/man/man1; ln -s python2.1 python.1) if test "xno" != "xno" ; then \ case no in \ upgrade) ensurepip="--upgrade" ;; \ install|*) ensurepip="" ;; \ esac; \ DYLD_LIBRARY_PATH=/var/folders/_z/k45qm7ls2sz1ffq5fggqpk3m0000...
如果我们单独运行python b.py得到结果如下: __name__ in b.py: __main__ 相应的我们运行python c.py,得到结果如下: __name__ in c.py: __main__ 观察上述两个输出,当我们直接运行脚本b.py或c.py,相应的脚本里的变量__name__都将被设置为__main__。 4. 使用场景 作为Python开发者,我们通常...
如上,我们可以看到if __name__ == '__main__'相当于Python模拟的程序入口,Python本身并没有这么规定,这只是一种编码习惯。由于模块之间相互引用,不同模块可能有这样的定义,而程序入口只有一个。到底哪个程序入口被选中,这取决于__name__的值。 2 __init__与self ...