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'
+# file1 = open(r'C:\Users\amywe\OneDrive\桌面\text.txt','w', encoding='utf-8')
+# file1.write("小兰：12本\n")
+# file1.write("小丽：11本\n")
+# file1.write("李文：9本\n")
+# file1.write("张伟：16本\n")
+# file1.close()
+# with open(open(r'C:\Users\amywe\OneDrive\桌面\text.txt','w', encoding='utf-8')as
+# file:
+#     file1.write("小兰：12本\n")
+#     file1.write("小丽：11本\n")
+#     file1.write("李文：9本\n")
+#     file1.write("张伟：16本\n")
+new_data=''
+with open (r'C:\Users\amywe\OneDrive\桌面\text.txt','r',
+encoding='utf-8') as file1:
+    for data in file1:
+        if'小兰：12本' in data:
+            data=data.replace('小兰：12本','小兰：11本')
+        new_data +=data
+
+with open (r'C:\Users\amywe\OneDrive\桌面\text.txt','w',
+encoding='utf-8') as file1:
+    file1.write(new_data)
+
+with open(r'C:\Users\amywe\OneDrive\桌面\text.txt','r',encoding='utf-8') as file1:
+    a=file1.read()
+    print(a)

diy1.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'
+# file1 = open(r'C:\Users\amywe\OneDrive\桌面\text.txt','w', encoding='utf-8')
+# file1.write("小兰：12本\n")
+# file1.write("小丽：11本\n")
+# file1.write("李文：9本\n")
+# file1.write("张伟：16本\n")
+# file1.close()
+
+# file1 = open(r'C:\Users\amywe\OneDrive\桌面\text.txt','a', encoding='utf-8')
+# file1.write("小强：10本\n")
+# file1.close()
+
+# with open(open(r'C:\Users\amywe\OneDrive\桌面\text.txt','w', encoding='utf-8')as
+# file:
+#     file1.write("小兰：12本\n")
+#     file1.write("小丽：11本\n")
+#     file1.write("李文：9本\n")
+#     file1.write("张伟：16本\n")
+#     file1.write("小强：10本\n")
+
+new_data=''
+with open (r'C:\Users\amywe\OneDrive\桌面\text.txt','r',
+encoding='utf-8') as file1:
+    for data in file1:
+        if'小强：10本' in data:
+            data=data.replace('小强：10本','小强：11本')
+        new_data +=data
+
+with open (r'C:\Users\amywe\OneDrive\桌面\text.txt','w',
+encoding='utf-8') as file1:
+    file1.write(new_data)
+
+with open(r'C:\Users\amywe\OneDrive\桌面\text.txt','r',encoding='utf-8') as file1:
+    a=file1.read()
+    print(a)

homework

+1.写入数据
+2.追加数据
+3.遍历所有的数据，控制台查看
+4.修改数据，并更新文件，然后读取全部
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