python 循环：for()while()

Posted 2020-12-04

格式：

    for 变量 in 列表:

    while 表达式：

一、for循环

#!/usr/bin/python

#for [0..5]
sum = 0;  #当我没有初始化sum时，会提示TypeError: unsupported operand type(s) for +: 'builtin_function_or_method' and 'int' 

for x in [0, 1, 2, 3, 4, 5]:
    sum = sum + x;
    print x, sum;
print sum;

#for [0..5]
sum = 0;
for x in range(6):
    sum += x;
    print x, sum;
print sum;

#for list/tuple
list = ['a', 'b', 'c', 'you'];
for list in list:
     print list;

二、while循环

#!/usr/bin/python

n = 9
while n > 0:
    print n;
    n -= 1;  #python不支持 ++/--操作