21-while-break
break是结束循环,break之后、循环体内代码不再执行。
while True:
yn = input('Continue(y/n): ')
if yn in ['n', 'N']:
break
print('running...')
22-while-continue
计算100以内偶数之和。
continue是跳过本次循环剩余部分,回到循环条件处。
sum100 = 0
counter = 0
while counter < 100:
counter += 1
# if counter % 2:
if counter % 2 == 1:
continue
sum100 += counter
print(sum100)
23-for循环遍历数据对象
astr = 'hello'
alist = [10, 20, 30]
atuple = ('bob', 'tom', 'alice')
adict = {
'name': 'john', 'age': 23}
for ch in astr:
print(ch)
for i in alist:
print(i)
for name in atuple:
print(name)
for key in adict:
print('%s: %s' % (key, adict[key]))
24-range用法及数字累加
# range(10) # [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
# >>> list(range(10))
# range(6, 11) # [6, 7, 8, 9, 10]
# range(1, 10, 2) # [1, 3, 5, 7, 9]
# range(10, 0, -1) # [10, 9, 8, 7, 6, 5, 4, 3, 2, 1]
sum100 = 0
for

本文通过21~30个Python实例,涵盖了while-break、while-continue、for循环、range用法、斐波那契数列、九九乘法表、列表解析、三局两胜游戏、文件基础操作和文件拷贝等内容,深入浅出地讲解了Python的循环控制和文件操作。
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