Python中的for循环中的`continue`和`pass`有区别吗？

Question

是否有例子

for element in some_list: 
    if not element: 
     pass 

和

for element in some_list: 
    if not element: 
     continue 

我应该知道的两个Python关键字之间continue和pass等之间的任何显著区别？

Answer 1

是的，他们做了完全不同的事情。 pass根本什么也不做，而continue继续下一个循环迭代。在您的示例中，如果在if之后添加了另一个语句，则区别将变得明显：在执行pass之后，将执行此更多语句。在continue之后，它不会。

>>> a = [0, 1, 2] 
>>> for element in a: 
...  if not element: 
...   pass 
...  print element 
... 
0 
1 
2 
>>> for element in a: 
...  if not element: 
...   continue 
...  print element 
... 
1 
2 

Answer 2

在这些例子中，如果声明是而不是最后一个循环，那么他们有非常不同的影响。

Answer 3

continue将跳回到循环的顶部。 pass将继续处理。

如果pass在循环的结尾处，则差异可以忽略不计，因为无论如何流只会回到循环的顶部。

Answer 4

在你的例子中，没有区别，因为两个语句都出现在循环结尾。 pass只是一个占位符，它不做任何事情（它将传递给下一个语句）。另一方面，continue有一个确定的目的：它告诉循环到继续就好像它刚刚重新启动。

for element in some_list: 
    if not element: 
     pass 
    print element 

是

for element in some_list: 
    if not element: 
     continue 
    print element 

Answer 5

是非常不同的，是有区别的。 continue强制循环在下一次迭代时启动，而pass表示“没有代码要在此执行”，并将继续循环剩余部分或循环体。

运行这些，看到了差距：

for element in some_list: 
    if not element: 
     pass 
    print 1 # will print after pass 

for element in some_list: 
    if not element: 
     continue 
    print 1 # will not print after continue 

Answer 6

是的，是有区别的。 Continue实际上会跳过当前循环的其余部分（返回到开头）。 Pass是一个空白语句，它什么都不做。

见python docs

Answer 7

他们之间的差异，
continue跳过循环的当前迭代，并执行下一次迭代。
pass什么都不做。这是一个空的语句占位符。
我宁愿给你一个例子，这会更好地阐明这一点。

>>> for element in some_list: 
...  if element == 1: 
...   print "Pass executed" 
...   pass 
...  print element 
... 
0 
Pass executed 
1 
2 

>>> for element in some_list: 
...  if element == 1: 
...   print "Continue executed" 
...   continue 
...  print element 
... 
0 
Continue executed 
2 

Answer 8

x = [1,2,3,4] 
for i in x: 
    if i==2: 
     pass #Pass actually does nothing. It continues to execute statements below it. 
     print "This statement is from pass." 
for i in x: 
    if i==2: 
     continue #Continue gets back to top of the loop.And statements below continue are executed. 
     print "This statement is from continue." 

输出是

>>> This statement is from pass. 

同样，让运行相同的代码具有小的改动。

x = [1,2,3,4] 
for i in x: 
    if i==2: 
     pass #Pass actually does nothing. It continues to execute statements below it. 
    print "This statement is from pass." 
for i in x: 
    if i==2: 
     continue #Continue gets back to top of the loop.And statements below continue are executed. 
    print "This statement is from continue." 

输出是 -

>>> This statement is from pass. 
This statement is from pass. 
This statement is from pass. 
This statement is from pass. 
This statement is from continue. 
This statement is from continue. 
This statement is from continue. 

通行证没有做任何事情。计算不受影响。但是继续回到循环的顶部，以便下一次计算。