ADD file via upload

文件.py

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+# -*- coding: utf-8 -*-
+"""
+Created on Mon Nov 29 16:15:40 2021
+
+@author: Administrator
+"""
+
+s1="李联国" 
+print(s1.encode('utf-8'))
+s2=s1.encode('utf-8') 
+print(s2.decode())#输出为李联国
+
+#打开
+f=open("score.txt","r+",encoding="utf-8")
+print(f.read())
+#f = open(file, mode, encoding=None) 
+#file：表示要打开的文件路径（相对或者绝对路径）
+#mode：表示文件打开模式；
+#r+
+#读写，会有输出
+#w+
+#消除原文件内容，然后写入新内容
+#a+
+#追加写入，如果该文件已存在，文件指针将会放在文件的结尾。不会有输出
+
+#encoding：用于设置编码格式，一般使用utf-8； 
+f.close()#关闭文本文件： f = close()
+
+#在Python中，为了防止文件打开后忘记关闭，提供了with语句来使用文件： 
+#with open(file, mode) as <文件对象名>: 语句块 
+with open("score1.txt","r+",encoding="utf-8") as s:
+    print(s.read())
+
+#读取
+with open("score.txt","r+",encoding="utf-8") as s:
+    print(s.read())#以字符串形式读取全部内容
+    s.seek(0)#把指针移回来，0表示移到首位
+    print(s.readline())#以字符串形式读取整行
+    s.seek(0)
+    print(s.readlines())#读取所有行，每行作为列表中一个元素返回一个列表，会读取换行符\n
+with open("score.txt","r+",encoding="utf-8") as s:#方法一
+    while True:
+        line=s.readline()
+        if line:#判断line是否为空
+            print(line,end="\n")
+        else:
+            break 
+with open("score.txt","r+",encoding="utf-8") as s:#方法二
+    lines=s.readlines()
+    print(lines)
+    for i in lines:
+        print(i,end="\n")
+        
+#将数据输出到文件   
+with open("test2.txt","w+",encoding="utf-8") as f:
+    str1="zhangsan 90\n"+"lisi 88\n"+"wangwu 78\n"
+    f.write(str1)#第一种方法:write([str]) write()方法用于向文件中写入一个字符串或字节流。 
+with open("test2.txt","r+",encoding="utf-8") as f:
+    print(f.read())
+
+with open("test1.txt","a+",encoding="utf-8") as f:
+    L=["001 zhangsan 100\n","002 lisi 99\n"]
+    f.writelines(L)#第二种方法:writelines([str]) writelines()方法用于向文件中写入一个序列的字符串，如元素为字符串的列表。换行需要自己添加换行符“\n”。
+with open("test1.txt","r+",encoding="utf-8") as f:
+    print(f.read())
+        
+with open("score.txt","r+",encoding="utf-8") as s:
+    lst1=s.readlines()
+    print(lst1)
+    for i in lst1:
+        x=i[0:3]
+        print(x)#姓名
+        i=i[3:]
+        i=i.split()
+        lst2=list(map(eval,i))
+        sum1=sum(lst2)
+        print(sum1)#总分
+        with open("totalscore.txt","a+",encoding="utf-8") as t:#把总分和姓名写入新的文件里
+            str1=f"{x},{sum1}\n"
+            print(str1)
+            t.write(str1)
+with open("totalscore.txt","r",encoding="utf-8") as t:#读出新文件
+    print(t.read())
+    
+with open("score1.txt","r+",encoding="utf-8") as s:
+    lst1=s.readlines()
+    print(lst1)
+    lst2=[]
+    for i in lst1:
+        mark=i[-3:-1]
+        mark=eval(mark)
+        lst2.append(mark)
+    print(lst2)    
+    average1=sum(lst2[0:5])/len(lst2[0:5])
+    average2=sum(lst2[6:9])/len(lst2[6:9])
+    print(average1)
+    print(average2)
+    lst4=lst2[2::3]
+    average3=sum(lst4)/len(lst4)
+    print(average3)
+
+#os模块
+import os 
+print(os.getcwd())#返回当前工作路径
+#chdir(path)：改变当前工作路径到指定的路径
+print(os.listdir("C:\\Users\\Administrator\\Desktop\\python学习"))#listdir(path)返回指定路径下的文件和文件夹列表
+#os.path.exists(path)：路径存在则返回 True，路径损坏返回 False
+if os.path.exists('score.txt'): 
+    print("file exists") 
+else:
+    print("file not exists")
+os.popen("copy test1.txt test3.txt")#复制文件
+    
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+    
+    
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+new=open("D:hi.txt","a+")#new为自己定义的变量
+#a+表示文件不存在就创建，存在继续追加
+print("hello world",file=new)#使用file=的形式
+new.close()
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+f=open("test1.txt","r",encoding="utf-8")
+print(f.read())
+#print(f.readlines())
+
+f=open("score.txt","r",encoding="utf-8")
+lst1=f.readlines()
+print(lst1)
+for date in lst1:
+    score=date.split()
+    print(score)
+    lst2=score[1:]
+    lst3=list(map(eval,lst2))#返回map对象，在转换成列表
+    print(lst3)
+    sum1=sum(lst3)
+    print(sum1)
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