将2182869这样的大数字格式化为2.1E8

Question

如何在Python中使用％格式化程序将大量格式格式化为2.1E8或3.2E10？

Answer 1

使用这样的电子格式类型：

'%.1E' % 2182869

Answer 2

%e格式可用于此目的：

myint = 2334566778899

>>> print("%1.2e"%myint)
2.33e+12

Answer 3

if user.present?
        if user.basic?
            can :read, :all
            can :active_orders_index, Order
            can :search_orders, Order
            can :focused_show, Location
            cannot :mark_task_completed, Task 
            can :finish_task, Task
            cannot :manage, User # ADDED LINE
        elsif user.location?
            can :read, Location, :name => user.username
            can :focused_show, Location, :name => user.username
            cannot :manage, User
        elsif user.admin?
            can :manage, :all
            cannot :manage, User, role: 3 # ADDED LINE
        elsif user.moderator?
            can :manage, :all
        end
 end