两个Python关键字continue和pass之间有什么显著的区别吗

for element in some_list:
    if not element:
        pass

and

for element in some_list:
    if not element:
        continue

我应该注意的?


当前回答

是的,他们做的事情完全不同。Pass只是什么都不做,而continue则继续进行下一次循环迭代。在您的示例中,如果在if之后添加另一条语句,区别就会很明显:在执行pass之后,将执行这条进一步的语句。在继续之后,它就不会了。

>>> 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

其他回答

是的,这是有区别的。Continue实际上跳过了当前循环迭代的其余部分(返回到开始)。Pass是一个空语句,不执行任何操作。

查看python文档

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."

输出为

>>> This statement is from pass.

同样,让我们运行相同的代码,只做了一些小更改。

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."

输出为-

>>> 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.

Pass什么都不做。计算不受影响。但是继续返回到循环的顶部继续进行下一个计算。

是的,这是有区别的。Continue强制循环在下一次迭代时开始,而pass意味着“这里没有代码要执行”,并将继续遍历循环体的剩余部分。

运行这些,看看有什么不同:

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

在您的示例中,没有区别,因为两个语句都出现在循环的末尾。Pass只是一个占位符,因为它什么都不做(它将执行传递给下一个语句)。另一方面,Continue有一个明确的目的:它告诉循环继续,就像它刚刚重新启动一样。

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

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

for循环中pass和continue的区别:

那么为什么要传入python呢?

如果你想创建一个空类,方法或块。

例子:

class MyException(Exception):
    pass


try:
   1/0
 except:
   pass

在上面的例子中没有'pass'将抛出IndentationError。