python中 while, if, for 语句有什么区别吗?比如在进行range函数循环时候。 python中的for i in range怎么用
Python\u4e2dfor\u5faa\u73af\u4e00\u5b9a\u8981\u6709range()\u51fd\u6570\u5417\uff1f\u5e76\u4e0d\u662f\u54e6\uff0crange\u7684\u76ee\u7684\u53ea\u662f\u4e3a\u4e86\u7528\u6570\u5b57\u751f\u6210\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff0c\u6362\u8a00\u4e4b\u4efb\u4f55\u53ef\u8fed\u4ee3\u5bf9\u8c61\u90fd\u53ef\u7528\u4e8efor\u5faa\u73af\uff0c\u4f8b\u5982\u5217\u8868\uff0c\u5143\u7d20\uff0c\u5b57\u5178\u7b49
python for i in range\u662f\u7528\u6765for\u5faa\u73af\u904d\u5386\u7684\u3002python\u4e2drange \u662f\u4e2a\u51fd\u6570\uff0crange() \u51fd\u6570\u53ef\u521b\u5efa\u4e00\u4e2a\u6574\u6570\u5217\u8868,python\u4e2d\u7528\u6765\u5728for\u5faa\u73af\u4e2d\u904d\u5386\u3002
\u7528\u6cd5\u5982\uff1a for i in range \uff081\uff0c3\uff09\u3002\u8bed\u6cd5\u683c\u5f0f\uff1arange(start, stop[, step])\uff0c\u5206\u522b\u662f\u8d77\u59cb\u3001\u7ec8\u6b62\u548c\u6b65\u957f\u3002
range()\u51fd\u6570\u8fd4\u56de\u7684\u5bf9\u8c61\u7684\u884c\u4e3a\u90fd\u5f88\u50cf\u4e00\u4e2a\u5217\u8868\uff0c\u4f46\u662f\u5b83\u786e\u5b9e\u4e0d\u662f\u4e00\u4e2a\u5217\u8868\uff0c\u5b83\u53ea\u662f\u5728\u5faa\u73af\u8fed\u4ee3\u7684\u60c5\u51b5\u4e0b\u8fd4\u56de\u6307\u5b9a\u7d22\u5f15\u7684\u503c\uff0c\u4f46\u662f\u5b83\u5e76\u4e0d\u4f1a\u5728\u5185\u5b58\u4e2d\u771f\u6b63\u4ea7\u751f\u4e00\u4e2a\u5217\u8868\u5bf9\u8c61\uff0c\u8fd9\u6837\u4e5f\u662f\u4e3a\u4e86\u8282\u7ea6\u5185\u5b58\u7a7a\u95f4\u3002\u5b9e\u9645\u7528\u6cd5\u5206\u4ee5\u4e0b\u51e0\u79cd\u60c5\u51b5\uff1a
for in range\uff083\uff09\u5373\uff1a\u4ece0\u52303\uff0c\u4e0d\u5305\u542b3\uff0c\u53730,1,2\u3002
2.for in range(1,3) \u5373\uff1a\u4ece1\u52303\uff0c\u4e0d\u5305\u542b3\uff0c\u53731,2\u3002
3.for in range\uff081,3,2\uff09\u5373\uff1a\u4ece1\u52303\uff0c\u6bcf\u6b21\u589e\u52a02\uff0c\u56e0\u4e3a1+2=3\uff0c\u6240\u4ee5\u8f93\u51fa\u53ea\u67091\u7b2c\u4e09\u4e2a\u6570\u5b572\u662f\u4ee3\u8868\u6b65\u957f\u3002\u5982\u679c\u4e0d\u8bbe\u7f6e\uff0c\u5c31\u662f\u9ed8\u8ba4\u6b65\u957f\u4e3a1\u3002
while是Python中的循环语句,if属于条件选择语句,而for in属于迭代语句。
while 用于重复执行操作,重复的条件不一定是特定的次数,只要条件满足即可:
# 打印1-5的平方
x = 1
while x <= 5:
print(x ** 2)
x = x + 1
if 与 循环迭代无关,在默认顺序执行代码的情况下,满意某个条件要以执行分支语句:
score = 66
if score >= 60:
print('及格')
for in用于遍历一个可迭代对象(如列表,元组,range等)的每一个元素,将迭代出的每个元素放入临时变量备用:
# 遍历1-5的序列元素,并打印平方
for x in range(1,6):
print(x ** 2)
扩展阅读:python网站 ... python while循环例子 ... java python ... python try except ... python while break ... while else ... python while true ... python for in range ... python do while循环 ...