Python 基本语法

 1 #coding=utf-8
 2 a=1
 3 b=2
 4 c=3
 5 #if else
 6 if a==1:
 7     print("a=1")
 8 else:
 9     print("a!=1")
10 
11 #if elif
12 if b==3:
13     print("b=3")
14 elif c==4:
15     print("c=4")
16 else:
17     print("c!=4")
18 # 三目运算符
19 print("表达式1" if c==3 else "表达式2")
20 
21 #循环语句
22 index=0
23 while index<5:
24     index+=1
25     print("while {0}".format(index))
26 else:
27     print("While Over")
28 index=0
29 for num in range(0,5):
30     print("for {0}".format(num))
31 else:
32     print("For Over")
33 
34 for num in range(5):
35     if num==3:
36         print("num==3 break")
37         break   # or continue