循环，具有优先级/顺序

Question

我在想，如果有可能的if语句嵌套在一个主一个像这样的内部优先级代码：

for blah: 
    if case1: 
     # takes highest priority and 
     # will execute first even if 
     # other cases are true 
    if case2: 
     # takes lower priority 
    if case3: 
     # takes lowest priority 

我能找到的唯一的事情也许是一个优先级队列等作为heapq，但我不完全理解如何工作，或者如果他们是相关的。

更专门为我的代码：

for x in list_of_lists: # x would be a list then containing multiple integers 
    if 1 in x and not (2 in x or 3 in x): 
     # basically just want to see if the list "x" = [1] 
     # takes highest priority and 
     # will execute first even if 
     # other cases are true 
    if 1 in x and (2 in x or 3 in x): 
     # checking to see if the list "x" contains a 1 and a 2, or a 1 and a 3 
     # takes lower priority 
    if something similar to the above: 
     # takes lowest priority 

Answer 1

这已经是这样了：

if True: 
    print(1) 

if True: 
    print(2) 

if False: 
    print(3) 

if True: 
    print(4) 

#>>> 1 
#>>> 2 
#>>> 4 

如果你想只打印1而是使用elif（简称else if）：

if True: 
    print(1) 

elif True: 
    print(2) 

elif False: 
    print(3) 

elif True: 
    print(4) 

#>>> 1 

这与01级联相同，因此else if收缩：

if True: 
    print(1) 

else: 
    if True: 
     print(2) 

    else: 
     if False: 
      print(3) 

     else: 
      if True: 
       print(4) 

#>>> 1 

Answer 2

您应该使用if-elif像它这样做here