auto save

diy.py

-# 写入同学们的捐赠明细：'小兰：12本'、'小丽：11本'、'李文：9本'、'张伟：16本'
-new_s=""
-with open(r"C:\Users\003\Desktop\jj.txt","r",encoding="utf-8") as fil2:
-    for i in fil2:
-        if "谭梦婕" in i:
-            i=i.replace("谭梦婕","谭艺杰")
-        new_s=new_s+i
-with open(r"C:\Users\003\Desktop\jj.txt","w",encoding="utf-8") as fil3:
-    fil3.write(new_s)
+r = 10
+n = 3.14
+C = 2*n*r
+S = n*r*r
+print(C)
+print(S)
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