for循环和可迭代对象的遍历
for x in (1,2,3)
可迭代对象可以是:
列表,元组,字符串,,字典,迭代器对象(iterator),生成器函数(generator),文件对象
range对象:
range对象可以传递 ‘步长’
九九乘法表的嵌套循环的练习
for x in range(1,10):
for y in range(1,x+1):
print("{0}*{1} = {2}".format(x,y,(x*y)),end="\t")
print()
#得出的结果
'''
1*1 = 1
2*1 = 2 2*2 = 4
3*1 = 3 3*2 = 6 3*3 = 9
4*1 = 4 4*2 = 8 4*3 = 12 4*4 = 16
5*1 = 5 5*2 = 10 5*3 = 15 5*4 = 20 5*5 = 25
6*1 = 6 6*2 = 12 6*3 = 18 6*4
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