2. Remove Multiple Items From a List Using If Statement You can remove multiple items from a list using the if control statement. To iterate the list using Pythonfor loopat a specific condition. For every itera
The example below shows the slicing technique of removing multiple items from a list using thedelkeyword. # Initialize a list with integers from 1 to 5my_list=[1,2,3,4,5]# Delete the elements from index 1 to index 2 (elements 2 and 3) from the list# This modifies the list to [...
listbox1.pack() # 设置滚动条,使用 yview使其在垂直方向上滚动 Listbox 组件的内容,通过绑定 Scollbar 组件的 command 参数实现 s.config(command = listbox1.yview) # 使用匿名函数,创建删除函数,点击删除按钮,会删除选项 bt = Button(win,text='删除',command = lambda x = listbox1:x.delete(ACTIVE...
although often parentheses are necessary anyway (if the tuple is part of a larger expression). It is not possible to assign to the individual items of a tuple, however it is possible to create tuples which
from tkinter import * # 创建主窗口 win = Tk() win.title("拜仁慕尼黑") win.geometry('400x200') # 创建列表选项 listbox1 =Listbox(win) listbox1.pack() # i表示索引值,item 表示值,根据索引值的位置依次插入 for item in ["穆勒","穆西亚拉","萨内","马内","德里赫特"]: ...
如果kafaka启动时加载的配置文件中server.properties没有配置delete.topic.enable=true,那么此时的删除并不是真正的删除,而是把topic标记为:marked for deletion 你可以通过命令: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 ./bin/kafka-topics--zookeeper 【zookeeper server】--list 来查看所有topic ...
# access a range of items x = a[1:4] print(x) print(type(x)) 1. 2. 3. 4. 5. 6. 执行和输出: 3. 列表长度 其实本文第 1. 节中已经用到了,将列表作为参数调用 Python 的全局函数就可以得到列表长度。 查找列表长度的 len() 函数语法如下: ...
# access a range of items x = a[1:4] print(x) print(type(x)) 执行和输出: 3. 列表长度 其实本文第 1. 节中已经用到了,将列表作为参数调用 Python 的全局函数就可以得到列表长度。 查找列表长度的 len() 函数语法如下: len(listname) ...
def source_list(request): # ~Q(source_id=0): 所有不等于0的items all_source_list = Source.objects.filter(~Q(id=0)) context = {'all_source_list': all_source_list} return render(request, 'source_list.html', context) F方法:可以实现基于自身字段值来过滤一组对象,它还支持加、减、乘、除...
items(),key=lambda d:d[0]) ii=0 for onerecord in reversed(list): ii=ii+1 if ii<11: strTotalLine+=onerecord[1] showinfo('Ranking', strHeadLine+strTotalLine) def StartByS(self,event): self.RndFirst() self.Start() self.Rnd() def Start(): app.RndFirst() app.Start() app.Rnd...