python for语句

for eachNum in [0, 1, 2]:
    print(eachNum)

#range()内建函数生成0 1 2...   
for eachNum in range(3):
    print(eachNum)
    
foo = 'abc'
for c in foo:
    print(c)

输出：

0
1
2
0
1
2
a
b
c