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Examples introduce the use of python random numbers, derivation and strings, double color balls

Sep 13, 2017 am 10:01 AM
python Instructions random number

The following editor will bring you an article on how to use python random numbers, derivation, and examples of string and double-color ball applet. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look.

is as follows:


#随机数的使用
import random #导入random
random.randint(0,9)#制定随机数0到9
i=random.sample(range(1,34),6)#输出6个随机数,范围是1到34
i.sort()#排序方法,排序时更改原数组,无返回值
sorted(i)#排序函数,排序时不影响原数组,产生新的排序后数据
print('----------------用上述的随机数做一个双色球---------------------')
sj=random.sample(range(1,34),6)
print(sj,random.randint(1,17))
#if多值判断
n=4
if n in (4,5,6,8):
  print('元组里面有',n,'这个值')
else:
  print('元组里面不存在',n,'这个值')

#利用while循环输出1dao100的和
i=0
he=0
while i<100 :
  he=he+i
  i+=1
print(he)
#list集合使用冒泡排序从大道小排序
li=[9,5,1,8,7,3]
for i in range(0,len(li)):
  for j in range(0,len(li)-i-1):
    if li[j]<li[j+1]:
      li[j],li[j+1]=li[j+1],li[j]
print(li)

#字符串的使用(方法,与参数)
zf=('我的家乡在河南!')
print(zf[4])#跟据下标输出,带第4个
print(zf[4:])#下标后面的字符
print(zf[2:5])#两下标之间的字符
print(zf[1:2]*2)#输出的字符串*2倍
print(zf.index('南'))#输出指定自负串的下标
print(zf.replace('的','得',1))#替换字符串,只替换一个
print(zf.endswith('南'),5,6)#最后的是否存在
print('家' in zf)#字符是否存在其中

#列表
print('---------------列表------------------')
lb=['abc','123']
print(lb.append('456'))#添加单个
lb+=['a','b']#添加多个
lb.remove('a')#删去一个
o=lb.pop(0)#指定下标输出
lb.insert(2,'125')#指定下标修改
lb.clear()#删除所有
print(lb)

print('--------推导--------')
td=['Hi','Hello','word','python','Height','wall','Hight']
print([s for s in td if s.startswith('H')])
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