一 python基础操作
1.用python简单的交换两个变量
a=1
b = 2
a, b =b, a
print(a,b)
这样就直接把ab互换了。
2.格式化输出
hero_name ='dva'
print('您选择的英雄是%s'%hero_name)
print('您选择的英雄是{hero_name}'.format(hero_name=hero_name))
*//代表取整除
3.多变量赋值操作
name, age, sex ='小明',18,'f'
print(name,age,sex)
4.数据类型转换
name = input('请输入')
print(type(name))
二.循环
1.while 条件：
条件满足时执行的事情
例子1：
while True:
print('老婆我错了')
这样会无限循环下去
i=0
while i<10
print('老婆我错了，这是我第%d次向您道歉’%i）
print('老婆我错了，这是我第{}次向您道歉'.format(i)
i+=1
例子2：计算1到100之间的偶数累加和
i=1
sum=0
while i<=100:
if i%2==0:
sum+=i
i+=1
print(sum)
循环的嵌套
i = 1
while i <= 5:
j = 1
while j <= i :
print("* ",end='')
j += 1
print('\n')
i += 1
*
* *
* * *
* * * *
制作一个九九乘法口诀表
i = 1
while i <=9:
j = 1
while j <= i :
print("%d * %d = %d " %(j ,i ,i*j),end='')
j += 1
print('\n')
1 * 1 = 1
1 * 2 = 2 2 * 2 = 4
1 * 3 = 3 2 * 3 = 6 3 * 3 = 9
1 * 4 = 4 2 * 4 = 8 3 * 4 = 12 4 * 4 = 16
1 * 5 = 5 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25
1 * 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 5 * 6 = 30 6 * 6 = 36
1 * 7 = 7 2 * 7 = 14 3 * 7 = 21 4 * 7 = 28 5 * 7 = 35 6 * 7 = 42 7 * 7 = 49
1 * 8 = 8 2 * 8 = 16 3 * 8 = 24 4 * 8 = 32 5 * 8 = 40 6 * 8 = 48 7 * 8 = 56 8 * 8 = 64
1 * 9 = 9 2 * 9 = 18 3 * 9 = 27 4 * 9 = 36 5 * 9 = 45 6 * 9 = 54 7 * 9 = 63 8 * 9 = 72 9 * 9 = 81
2.for循环
for 临时变量
company = 'neusoft'
for x in company:
print(x)
if x== 's':
print("这个s要大写")
n
e
u
这个s要大写
o
f
t
3.range()函数
range(起始值，终值)
for i in range (1, 101 ):
print(i)
4.break：立刻结束break 所在的循环
contine 结束当前循环，紧接着执行下一次循环
company = 'neusoft'
for x in company:
print('__________')
if x =='s':
break
print(x)
else:
print('for循环没有执行break')
5.contine的循环
company = 'neusoft'
for x in company:
print('__________')
if x =='s':
continue
print(x)
else:
print('for循环没有执行break')
三，字符串
word = "hello ,'c'"
print(word)
访问字符串 下标
print(word[1])
切片 对目标对象截取一部分的操作
对象【起始： 终止 ： 步长】不包括结束位置
name ='abcdef'
print(name[0:3])#abc
print(name[3:5])#de
print(name[2:])#cdef
print(name[1:-1])#bcde
print(name[:])#abcdef
print(name[: :2])#ace
print(name[5:1:-2])#fd
print(name[::-1])#fedcba倒叙
字符串常见操作
my_str ='hello world neueud and neudeucpp'
find()
检查str中是否包含在 my_str中，如果在返回开始的索引值，否则返回-1
index1 = my_str.find('neueud')
print(index1)
index2 = my_str.find('neueud',0,10)
print(index2)
index()跟find（）一样 只不过str 不在mystr中要报一个异常
count返回 目标字符串出现的次数
count = my_str.count('neuedu',0,10)
print(count)
四，小游戏：跟电脑石头剪刀布
import random
player = input('请输入：剪刀(0),石头(1),布(2):')
player =int(player)
computer = random.randint(0,2)#生成0到2的随机数
if ((player==0 and computer==2)
or (player==1 and computer==0)
or (player==2 and computer==1) ):
print('恭喜您获胜了')
elif(player==computer):
print('平局')
else:
print('你输了')
