Python编程（for 浙江高考选考）

原创已于 2022-02-08 18:30:05 修改 · 1.8k 阅读

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#python

于 2021-07-11 13:03:29 首次发布

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这篇博客涵盖了Python编程的基础练习，包括简单的A+B问题、数字格式化以及质数计算。还涉及了马的路径遍历问题，以及DataFrame中as_index参数的理解。文章通过实例展示了如何使用Python进行计算和数据处理，适合初学者巩固基础知识。

A+B
https://oj.czos.cn/problem.php?id=1000

a,b=map(int,input().split())
print(a+b)

保留两位小数的三种写法

#方法1：
print("%.2f" % 0.13333)
#方法2
print("{:.2f}".format(0.13333))
#方法3
print(round(0.13333,2))

100以内的质数

num=[];
i=2
for i in range(2,101):
   for j in range(2,i):
      if(i%j==0):
         break
   else:
      num.append(i)
print(num)

a=int(input())
c=0
for i in range(2,a+1):
    for j in range(2,i):
        if(i%j==0):break
    else:
        print(i,end=' ')
        c=c+1
        if(c%5==0):print()

马的遍历
https://www.luogu.com.cn/problem/P1443


```python
n,m,x,y=map(int,input().split())
dx=[-1,1,2,2,1,-1,-2,-2]
dy=[2,2,1,-1,-2,-2,-1,1]
from collections import deque
res=[[-1]*m for _ in range(n)]
res[x-1][y-1]=0
qu=deque([(x-1,y-1)])
while len(qu)>0:
    x,y=qu.popleft()
    for i in range(8):
        nx,ny=x+dx[i],y+dy[i]
        if 0<= nx<n and 0<=ny<m and res[nx][ny]==-1:
            res[nx][ny]=res[x][y]+1
            qu.append((nx,ny))

for i in range(n):
    for j in range(m):
        print("{:<5}".format(res[i][j]),end="")
    print()

as_index的理解
import pandas as pd
df = pd.DataFrame(data={'books':['bk1','bk1','bk1','bk2','bk2','bk3'], 'price': [12,12,12,15,15,17]})
print(df)
print()
print(df.groupby('books', as_index=True).sum())
print()
print(df.groupby('books', as_index=False).sum())



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![在这里插入图片描述](https://img-blog.csdnimg.cn/a648489d91d34df59daba25124028d7c.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY29kZWlza2luZw==,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center)


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![在这里插入图片描述](https://img-blog.csdnimg.cn/1102e644ecb845d9a1ccad135c25bbd2.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY29kZWlza2luZw==,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center)
![在这里插入图片描述](https://img-blog.csdnimg.cn/e766ab492aa74f018523df353e49b876.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY29kZWlza2luZw==,size_15,color_FFFFFF,t_70,g_se,x_16)


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![在这里插入图片描述](https://img-blog.csdnimg.cn/480b903f3027423489802f1e7a87c941.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY29kZWlza2luZw==,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center)
![图2](https://img-blog.csdnimg.cn/09599148711d475ca62e31927132ca9a.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY29kZWlza2luZw==,size_15,color_FFFFFF,t_70,g_se,x_16#pic_center)




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