for循环:
a = [11,22,33,44] for i in a: print (i)
结果:
11 22 33 44
while循环:
i=0 while i < 3: #i<3为循环条件,当条件为真时,执行后面的循环体;条件为假时不执行 print (i) i += 1
结果:
0 1 2
break和Continue:
i= 0 while i < 10: print ("i->:",i) if i == 5: break #当i==5时,退出所有循环 i += 1
结果:
i->: 0 i->: 1 i->: 2 i->: 3 i->: 4 i->: 5
x=0 while x < 9: for x in range(0,10): if x ==6: continue #当x==6时,跳出当前循环,继续下一次循环 print("x->:", x)
结果:
x->: 0 x->: 1 x->: 2 x->: 3 x->: 4 x->: 5 x->: 7 #缺少x->: 6 x->: 8 x->: 9
其他:
enumrate:
a = ["aa","bb","cc","dd"] for i in enumerate(a,5): #默认编号从0开始,可以手动变更 print (i)
结果:
(5, 'aa') (6, 'bb') (7, 'cc') (8, 'dd')
range:
1、
for n in range(1, 10): print (n)
结果:
1 2 3 4 5 6 7 8 9
2、
for x in range(0,20,4): print (x)
结果:
0 4 8 12 16 #以4作为step,依次打印