Styjun

Why don't humans perceive waves as twice the frequency they are?

What is this green alien supposed to be on the American covers of the "Hitchhiker's Guide to the Galaxy"?

Who would use the word "manky"?

Demographic consequences of closed loop reincarnation

How to not confuse readers with simultaneous events?

What makes MOVEQ quicker than a normal MOVE in 68000 assembly?

Should I have one hand on the throttle during engine ignition?

Could a US citizen born through "birth tourism" become President?

The most secure way to handle someone forgetting to verify their account?

How was Luke's prosthetic hand in Episode V filmed?

How important are the Author's mood and feelings for writing a story?

Why is the Intel 8086 CPU called a 16-bit CPU?

Why do space operations use "nominal" to mean "working correctly"?

How do you send money when you're not sure it's not a scam?

Why do the digits of a number squared follow a similar quotient?

Why teach C using scanf without talking about command line arguments?

Is it possible to have a career in SciComp without contributing to arms research?

Improving an O(N^2) function (all entities iterating over all other entities)

Why does a tetrahedral molecule like methane have a dipole moment of zero?

Why aren't there any women super GMs?

Why do jet engines sound louder on the ground than inside the aircraft?

Probability that the price of stock following a brownian motion goes under a certain value

Can error correction and detection be done without adding extra bits?

Who or what determines if a curse is valid or not?

What does single do?

What does the “yield” keyword do?What does ** (double star/asterisk) and * (star/asterisk) do for parameters?How to merge two dictionaries in a single expression?What is the yield keyword used for in C#?What are metaclasses in Python?What is the difference between @staticmethod and @classmethod?What does the “yield” keyword do?Does Python have a ternary conditional operator?What does if __name__ == “__main__”: do?What is __init__.py for?Does Python have a string 'contains' substring method?

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

0

I have some codes below but I don't know what does the statement yield do. If I only call f.foo(), nothing will be printed. However, if f.test() is called, the list a first will be printed, then the string OK, and finally the list b will be printed. So what does the single yield do in general?

from contextlib import contextmanager
class Foo(object):
@contextmanager
def foo(self):
 a = [1, 2, 3]
 print (a)
 yield
 b = [2, 3, 4]
 print (b)
def test(self):
 with self.foo():
 print ("OK")
if __name__ =="__main__":
 f = Foo()
 f.foo()

python python-3.x yield

share|improve this question

edited Mar 26 at 10:41

Charlie Tran

asked Mar 26 at 10:37

Charlie TranCharlie Tran

611 bronze badge

• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  
  Have you read the documentation of contextlib. contextmanager?
  
  – DeepSpace
  Mar 26 at 10:41
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Possible duplicate of What does the "yield" keyword do?
  
  – Carlos Gonzalez
  Mar 26 at 10:45
  

  
  
  
  

add a comment | 

0

I have some codes below but I don't know what does the statement yield do. If I only call f.foo(), nothing will be printed. However, if f.test() is called, the list a first will be printed, then the string OK, and finally the list b will be printed. So what does the single yield do in general?

from contextlib import contextmanager
class Foo(object):
@contextmanager
def foo(self):
 a = [1, 2, 3]
 print (a)
 yield
 b = [2, 3, 4]
 print (b)
def test(self):
 with self.foo():
 print ("OK")
if __name__ =="__main__":
 f = Foo()
 f.foo()

python python-3.x yield

share|improve this question

edited Mar 26 at 10:41

Charlie Tran

asked Mar 26 at 10:37

Charlie TranCharlie Tran

611 bronze badge

• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  
  Have you read the documentation of contextlib. contextmanager?
  
  – DeepSpace
  Mar 26 at 10:41
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Possible duplicate of What does the "yield" keyword do?
  
  – Carlos Gonzalez
  Mar 26 at 10:45
  

  
  
  
  

add a comment | 

I have some codes below but I don't know what does the statement yield do. If I only call f.foo(), nothing will be printed. However, if f.test() is called, the list a first will be printed, then the string OK, and finally the list b will be printed. So what does the single yield do in general?

from contextlib import contextmanager
class Foo(object):
@contextmanager
def foo(self):
 a = [1, 2, 3]
 print (a)
 yield
 b = [2, 3, 4]
 print (b)
def test(self):
 with self.foo():
 print ("OK")
if __name__ =="__main__":
 f = Foo()
 f.foo()

python python-3.x yield

share|improve this question

edited Mar 26 at 10:41

Charlie Tran

asked Mar 26 at 10:37

Charlie TranCharlie Tran

611 bronze badge

from contextlib import contextmanager
class Foo(object):
@contextmanager
def foo(self):
 a = [1, 2, 3]
 print (a)
 yield
 b = [2, 3, 4]
 print (b)
def test(self):
 with self.foo():
 print ("OK")
if __name__ =="__main__":
 f = Foo()
 f.foo()

share|improve this question

edited Mar 26 at 10:41

Charlie Tran

asked Mar 26 at 10:37

Charlie TranCharlie Tran

611 bronze badge

share|improve this question

edited Mar 26 at 10:41

Charlie Tran

asked Mar 26 at 10:37

Charlie TranCharlie Tran

611 bronze badge

asked Mar 26 at 10:37

Charlie TranCharlie Tran

611 bronze badge

asked Mar 26 at 10:37

Charlie TranCharlie Tran

611 bronze badge