Python Builder Generator Usage example analysis

This example describes the Python builder generator usage. Share to everyone for your reference. Specific as follows:

With yield, you can let a function generate a result sequence, not just a value

For example:

def countdown (n):   print "Counting" while   n>0:     yield n #生成一个n值     

Next () calls the generator function to run until the next yield statement, where next () passes the return value to yield. And the function pauses abort execution. When next () is called again, the function will continue executing the statement after yield. This process continues until the function returns.

Instead of manually invoking next () as above, the for loop is usually used, for example:

>>> for I in Countdown (5): ...   Print I ...   

Next (), the return value of Send () is the argument after yield, the difference between send () and next () is that send () is the expression that sends a parameter to (yield N), as its return value to M, and next () is send a none to (yield N) expressions, it is necessary to distinguish between a call to next (), the return value of Send (), and a return value of (yield N), which are not the same. Look at the output can be distinguished.

def h (N): While   n>0:     m = (yield n)     print "M is" +str (m)     n-=1     

Hopefully this article will help you with Python programming.

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