Python--enum

# Enum is used for enumeration, there is an enum under the module, we define the class to inherit it # once inherited, then we define the key (MUFANWU), cannot have duplicate values. # If you want to ensure that value (MUFANWU) is not duplicated, then introduce a unique, add this adorner to the class we define from the enum import enum, Unique@uniqueclass Color (enum):    red = 1    Green = 2    blue = 3    yellow = 4    pink = 5    cyan = 6# gets a member by name, two ways print (color["Red"])  # color.redprint (Col or.red)  # color.red# by value to get member print (Color (2))  # color.green# Gets the name and value of the member print (Color.red.name)  # redprint ( Color.red.value)  # # can also get members by iteration for the color in color:    print (Color.name, color.value) ' Red 1green 2blue 3yellow 4pink 5cyan 6 "

　　

# If you do not add a unique, it will allow the same value. From enum import Enumclass Girls (enum): Satori = 1 Mashiro = 2 Nagisa = 3 Tomoyo = 4 Kurisu = 5 Sola = # Satori and sola values are 1print (Girls (1)) # Girls.satori, you will find that only satori is printed, that is, the first one. If the value is the same, then the latter is equivalent to the former alias. # traversal, will find Sola also not be printed out for girl in Girls:print (girl) " Girls.satoriGirls.satoriGirls.mashiroGirls.nagisaGirls.tomoyoGirls.kurisu ' # What if you want to get all the members, even if the values are the same? # Enum Property has a __members__ property, equivalent to a dictionary for Girl in Girls.__members__.items (): Print (Girl) "' (' Satori ', <girls.satori:1& gt;) (' Mashiro ', <Girls.mashiro:2>) (' Nagisa ', <Girls.nagisa:3>) (' Tomoyo ', <Girls.tomoyo:4>) (' Kurisu ', <Girls.kurisu:5>) (' Sola ', <Girls.satori:1>) ' # will be found in a more detailed way to print out # and the second element of each tuple is <enum ' Girls ' > Type # Don't be fooled by <>, actually we use Girls.satori,girls.mashiro Get results for girl in Girls.__members__.items (): Print (Girl[1].name, girl[1].value) ' Satori 1mashiro 2nagisa 3tomoyo 4kur ISU 5satori 1 "# members can also be compared, but only with ==,is and other operators, do not support size comparison print (GIRLS.SAtori is Girls.mashiro) # falseprint (Girls.satori = Girls.mashiro) # Falseprint (Girls.satori is Girls.sola) # True, because two Value, the latter is the alias of the former, two pointers to the same place print (Girls.satori is Girls.sola) # true# If you change 1 to a list, class Girls (Enum): Satori = [1, 2] Ma  Shiro = 2 Nagisa = 3 Tomoyo = 4 Kurisu = 5 Sola = [1, 2] Kurumi = [1, 2]print (Girls.satori is Girls.sola) # Trueprint (Girls.satori is Girls.sola) # Trueprint (Girls.kurumi is Girls.sola) # true# will find still True, although the list is mutable type, but if the value is the same, it will continue to let Sola pointer to satori Pointer to memory # because of the same value, then sola as a Satori Reference # same as a Kurumi is the same result # without __members__, the print is still the first Satori

　　

Python--enum