Python_day01_作业笔记

while True:print(111)print(222)continue #结束本次循环&＃xff0c;继续下一次循环print(333)打印结果&＃xff1a; 111 222 111 222 111 222 ............

count &＃61; 0
while count <&＃61;5:count &＃61; count &＃43;1print(&＃39;loop&＃39;,count)
else:print(&＃39;循环正常执行完毕‘)
print(&＃39;---out of while loop---&＃39;)

Loop 1
Loop 2
Loop 3
Loop 4
Loop 5
Loop 6
循环正常执行完毕
----out of while loop----

count &＃61; 0
while count <&＃61;5:count &＃61; count &＃43;1if count &＃61;&＃61; 3:breakprint(&＃39;loop&＃39;,count)
else:print(&＃39;循环正常执行完毕‘)
print(&＃39;---out of while loop---&＃39;)

loop 1
loop 2
---out of while loop ---

1) 变量名只能由字母&＃xff0c;数字&＃xff0c;下划线三者任意组合
2) 变量名不能由数字开头
3) 变量名不能包含空格&＃xff0c;但可以使用下划线来分割其中的单词
4) 不要用python关键字和函数名用作变量名
5) 变量名应该简洁又具有描述性
6) 慎用小写字母I和O&＃xff0c;因为他们可能会被误认为1和0

if语句
if onditional_testing:do something

if-else语句
if condition_testing:do something
else:do something

if-elif-else语句
if conditioin_testing:do something
elif condition_testing2:do something
else:do something

if-elif-elif-elif 语句
if conditiong_testing1:do something
elif condition_testing2:do something
elif condition_testing3:do something

if嵌套语句&＃xff1a;
if condition_testing1:if condition_testing2:do somethingdo something

print("文能提笔安天下, \n武能上马定乾坤. \n 心存谋略何人胜, \n古今英雄唯是君.")

number &＃61; int(input(&＃39;请输入数字&＃39;))
if number > 66:print(&＃39;猜测的结果大了.&＃39;)
elif number <66:print(&＃39;猜测的结果小了.&＃39;)
else:print(&＃39;猜测结果正确&＃39;)

age &＃61; int(input(please input your age:))
if age<10:print(&＃39;小屁孩&＃39;)
elif age > 10 and age <20:print(&＃39;青春期叛逆的小屁孩.&＃39;)
elif age > 20 and age <30:print(&＃39;开始定性, 开始混社会的小屁孩儿.&＃39;)
elif age > 30 and age <40:print(&＃39;看老大不小了, 赶紧结婚小屁孩儿.&＃39;)
elif age > 40 and age <50:print(&＃39;家里有个不听话的小屁孩儿.&＃39;)
elif age > 50 and age <60:print(&＃39;自己马上变成不听 话的老屁孩 儿.&＃39;)
elif age > 60 and age <70:print(&＃39;活着还不错的老屁孩儿.&＃39;)
elif age > 70 and age <90:print(&＃39;人生就快结束了的一个 老屁孩儿.&＃39;)
elif age >&＃61; 90:print(&＃39;再见了这个世界.&＃39;)

单行注释&＃xff1a; #
多行注释&＃xff1a; &＃39;&＃39;&＃39; &＃39;&＃39;&＃39; and """ ""

1) python2 中无需将要print的内容放在括号内&＃xff0c;python3中print内容括号必不可少2&＃xff09;python2中 整数除法的结果中只包含整数部分&＃xff0c;小数部分被删除&＃xff0c;eg 3/23&＃xff09;通过input()解析用户的输入&＃xff0c;python3中input得到的是str型&＃xff0c;python2中得到的是int型。

comment &＃61; input(&＃39;请输入内容:&＃39;)
if comment &＃61;&＃61; &＃39;麻花藤&＃39;:print(&＃39;真聪明&＃39;)
else:print(&＃39;是傻逼么&＃39;)

while True:print(&＃39;1 2 3 4 5 6 8 9 10 &＃39;)

counts&＃61;[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20
,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,
41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61
,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,
82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100]
print(sum(counts))

def sum():sum&＃61;0for n in range(1,101):sum &＃61; sum &＃43; nreturn sum
print(sum())

count &＃61; 1
while count <101:print(count)count &＃61; count &＃43; 2

count &＃61; 2
while count <101:print(count)count &＃61; count &＃43; 2

count1 &＃61; [1,3,5,7,9,11,13,15,17,19,21,23,
25,27,29,31,33,35,37,39,41,43,45,47,49,51,
53,57,59,61,63,65,67,69,71,73,75,77,79,81,
83,85,87,89,91,93,95,97,99]
count2 &＃61; [-2,-4,-6,-8,-10,-12, -14,-16,-18,
-20,-22,-24,-26,-28,-30,-32,-34,-36,-38,-40,
-42,-44,-46,-48,-50,-52,-54,-56,-58,-60,-62,
-64,-66,-68,-70,-72,-74,-76,-78,-80,-82,-84,
-86,-88,-90,-92,-94,-96,-98]
print(sum(count1&＃43;count2))

n &＃61; 1
sum &＃61; 0
while n <101:mod &＃61; n % 2 #mod judgeif mod &＃61;&＃61; 1:sum &＃61; sum &＃43; nelse:sum &＃61; sum - nn &＃61; n &＃43; 1
print(sum)

i &＃61; 2
while i <3 and i >&＃61; 0:name &＃61; input(&＃39;请输入用户名&＃xff1a;&＃39;)password &＃61; input(&＃39;请输入密码&＃xff1a;&＃39;)if name &＃61;&＃61;&＃39;Adden&＃39; and password &＃61;&＃61; &＃39;123321&＃39;:print(&＃39;登陆成功&＃39;)breakelse:print(&＃39;账户余密码不匹配&＃xff0c;剩余登陆次数&＃xff1a;&＃39; &＃43; str(i))i &＃61; i -1
else:print(&＃39;您已没有重试机会&＃xff0c;账户被锁定&＃39;)