百行代码入门Python - Chapter 1

xiaoxiao2024-06-02 120

以下代码均用Python 3.5.2编写。一下代码建立在一个名为HelloWorld.py的主程序中，当然名字是次要的，随便取一个，只要不和本文中的其它文件重名即可。读懂以下示例代码即可入门Python：

#Basics print("Hello World") example_dict={"liaobin":20, "yujing":18, "jiansheng":16} print(example_dict["yujing"]) #if elif else Structure if example_dict["liaobin"]>20: example_dict["yujing"]=example_dict["yujing"]+1 print("Yujing + 1") elif example_dict["liaobin"]<20: example_dict["yujing"]=example_dict["yujing"]-1 print("Yujing - 1") else: print("Nothing happened") #for in Loop for i in [1,2, [3,4],"life"]: print(i) for i in range(3): print(i, "Hello for") #while Loop while i<5: print(i, "Hello while") i = i+1 #Function Definitation def square_sum(a,b): """Return the square sum of two parameters""" a=a**2 b=b**2 return a+b print(square_sum(1,2)) print(square_sum(b=2,a=1)) #package and unpackage def package_position(*all_parameters): print(type(all_parameters)) print(all_parameters[0]) print(all_parameters[-1]) package_position(1,4,6) def package_keyword(**all_parameters): print(type(all_parameters)) print(all_parameters) package_keyword(a=1,b=3,c=5) def unpackage(a,b,c): print(a) print(b) print(c) pkg_tuple=(5,6,7) pkg_dict={"a":5,"b":6,"c":7} unpackage(*pkg_tuple) unpackage(*pkg_dict) unpackage(**pkg_dict) #Module from first import laugh for i in range(2): laugh()

一下代码在一个名为first.py的文件中，注意保存到与主文件相同的目录下

#Module def laugh(): print("Ha") def big_laugh(): print("HaHaHa")

按照代码分段从头开始看将后面的注释掉，即可体会其中原理。