2. Python语言基本语法

（1）定义变量

a = 10
b = 2
c = a + b

（2）判断语句

score = 90

if score >= 80 :
   print("优秀")
elif score >= 70 :
   print("中等")
elif score >= 60 :
  print("及格")
else:
   print("不及格")

（3）循环

for i in range(0,5,2):
   print(i)
print("================")
for i in range(0,5):
   print(i)
print("================")

print("Item {0} {1}".format(10,"eee"))

for i in range(0,5):
   print(i)
else:
   print("循环结束")

（4）函数

def sayHello():
   print("Hello world")

sayHello()

def myMax(x,y):
   if x > y :
      print x,"is Max"
   else:
      print y,"is Max"
myMax(10,9)

def myMaxVal(x,y):
   if x > y :
      return x
   return y

print(myMaxVal(10,8))

（5）对象

class Hello:
   def __init__(self, name):
      self.name = name
      print("Hello 构造函数")
   def __del__(self):
      print("Hello 析构函数")

   def sayHello(self):
      print("Hello {0}".format(self.name))

class Hi(Hello):
   def __int__(self,name):
      Hello.__init__(self,name)
      self.name = name
      print("Hi 构造函数")

   def sayHi(self):
      print("Hi {0}".format(self.name))

#Hello对象
h = Hello("zhangsan")
h.sayHello()

#Hi对象
hi = Hi("lisi")
hi.sayHi()
hi.sayHello()

 (6) 引入Python文件

mylib.py

# coding=utf-8
class Hello:
   def __init__(self, name):
      self.name = name
      print("Hello 构造函数")
   def __del__(self):
      print("Hello 析构函数")

   def sayHello(self):
      print("Hello {0}".format(self.name))

引用的两种方法

#第一种
import  mylib

h = mylib.Hello("John")
h.sayHello()

#第二种
from mylib import Hello

h = Hello("John")
h.sayHello()