auto save

cs.py

+a=list(input("输入字符串："))
+while True:
+    for i in range(len(a)):
+        if a[i]>='0' and a[i]<='9':
+            a.pop(i)
+            break
+    else:
+        
+print(a)
\ No newline at end of file

diy.py

+user='python'
+password='12345'
+while True:
+    a=input("输入用户名：")
+    b=input("输入密码：")
+    if user==a and password==b:
+        print("登录成功！")
+        break
+    if user!=a:
+        print("用户名错误！")
+        continue
+    if password!=b:
+        print("密码错误！")
+        continue

test.py

+# a='dfds'
+# b='d'
+# print(a-b)
+# a=[1,2,3,4,5]
+# a.sort(reverse=True)
+# print(a)
+# a={'a':123,'b':345,'c':456}
+# b=a{,}
+# print(b)
+from copy import deepcopy
+a={'a':123,'b':345,'c':456}
+b=a
+c=deepcopy(a)
+a['a']=678
+print(a)
+print(b)
+print(c)
\ No newline at end of file