How to yield a list to stream values to flask?
I have this list which is dynamically generated by querying the database, but for the purposes of this question, I use a static list for demonstration.
I want to stream values to a web page so I thought a generator is best to use. Below is my python code:
list111 = [1,2,3,4,5]
for i in list111:
def events():
print(i)
yield "data: %snn" % (i)
return Response(events(), content_type='text/event-stream')`
I am expecting this script to print 1 to 5 but instead it keeps on printing 1. Is it the wrong way to yield a list?
This is what I am using on the client side (for reference purposes):
if (!!window.EventSource) {
var source = new EventSource('/upload');
console.log(source)
source.onmessage = function(e) {
console.log(e)
var byte = e.data;
console.log(e.data)
}
}
python python-3.x
edited Nov 15 '18 at 10:17
martineau
68.5k1090183
asked Nov 15 '18 at 9:41
Duck_dragonDuck_dragon
628
add a comment |
I have this list which is dynamically generated by querying the database, but for the purposes of this question, I use a static list for demonstration.
I want to stream values to a web page so I thought a generator is best to use. Below is my python code:
list111 = [1,2,3,4,5]
for i in list111:
def events():
print(i)
yield "data: %snn" % (i)
return Response(events(), content_type='text/event-stream')`
I am expecting this script to print 1 to 5 but instead it keeps on printing 1. Is it the wrong way to yield a list?
This is what I am using on the client side (for reference purposes):
if (!!window.EventSource) {
var source = new EventSource('/upload');
console.log(source)
source.onmessage = function(e) {
console.log(e)
var byte = e.data;
console.log(e.data)
}
}
python python-3.x
edited Nov 15 '18 at 10:17
martineau
68.5k1090183
asked Nov 15 '18 at 9:41
Duck_dragonDuck_dragon
628
You return in the first iteration of the loop, so it only returns theeventsgenerator yielding a single "data: 1nn".
– L3viathan
Nov 15 '18 at 9:48
should I add return inside events
– Duck_dragon
Nov 15 '18 at 9:54
You want to return a generator yielding several strings? Put the loop insideevents
– L3viathan
Nov 15 '18 at 9:59
@L3viathan thanks got it.
– Duck_dragon
Nov 15 '18 at 10:04
add a comment |
I have this list which is dynamically generated by querying the database, but for the purposes of this question, I use a static list for demonstration.
I want to stream values to a web page so I thought a generator is best to use. Below is my python code:
list111 = [1,2,3,4,5]
for i in list111:
def events():
print(i)
yield "data: %snn" % (i)
return Response(events(), content_type='text/event-stream')`
I am expecting this script to print 1 to 5 but instead it keeps on printing 1. Is it the wrong way to yield a list?
This is what I am using on the client side (for reference purposes):
if (!!window.EventSource) {
var source = new EventSource('/upload');
console.log(source)
source.onmessage = function(e) {
console.log(e)
var byte = e.data;
console.log(e.data)
}
}
python python-3.x
edited Nov 15 '18 at 10:17
martineau
68.5k1090183
asked Nov 15 '18 at 9:41
Duck_dragonDuck_dragon
628
I have this list which is dynamically generated by querying the database, but for the purposes of this question, I use a static list for demonstration.
I want to stream values to a web page so I thought a generator is best to use. Below is my python code:
list111 = [1,2,3,4,5]
for i in list111:
def events():
print(i)
yield "data: %snn" % (i)
return Response(events(), content_type='text/event-stream')`
I am expecting this script to print 1 to 5 but instead it keeps on printing 1. Is it the wrong way to yield a list?
This is what I am using on the client side (for reference purposes):
if (!!window.EventSource) {
var source = new EventSource('/upload');
console.log(source)
source.onmessage = function(e) {
console.log(e)
var byte = e.data;
console.log(e.data)
}
}
python python-3.x
python python-3.x
edited Nov 15 '18 at 10:17
martineau
68.5k1090183
asked Nov 15 '18 at 9:41
Duck_dragonDuck_dragon
628
edited Nov 15 '18 at 10:17
martineau
68.5k1090183
asked Nov 15 '18 at 9:41
Duck_dragonDuck_dragon
628
edited Nov 15 '18 at 10:17
martineau
68.5k1090183
edited Nov 15 '18 at 10:17
martineau
68.5k1090183
edited Nov 15 '18 at 10:17
martineau
68.5k1090183
68.5k1090183
asked Nov 15 '18 at 9:41
Duck_dragonDuck_dragon
628
asked Nov 15 '18 at 9:41
Duck_dragonDuck_dragon
628
asked Nov 15 '18 at 9:41
Duck_dragonDuck_dragon
628
628
You return in the first iteration of the loop, so it only returns theeventsgenerator yielding a single "data: 1nn".
– L3viathan
Nov 15 '18 at 9:48
should I add return inside events
– Duck_dragon
Nov 15 '18 at 9:54
You want to return a generator yielding several strings? Put the loop insideevents
– L3viathan
Nov 15 '18 at 9:59
@L3viathan thanks got it.
– Duck_dragon
Nov 15 '18 at 10:04
add a comment |
You return in the first iteration of the loop, so it only returns theeventsgenerator yielding a single "data: 1nn".
– L3viathan
Nov 15 '18 at 9:48
should I add return inside events
– Duck_dragon
Nov 15 '18 at 9:54
You want to return a generator yielding several strings? Put the loop insideevents
– L3viathan
Nov 15 '18 at 9:59
@L3viathan thanks got it.
– Duck_dragon
Nov 15 '18 at 10:04
You return in the first iteration of the loop, so it only returns the
events generator yielding a single "data: 1nn".– L3viathan
Nov 15 '18 at 9:48
You return in the first iteration of the loop, so it only returns the
events generator yielding a single "data: 1nn".– L3viathan
Nov 15 '18 at 9:48
should I add return inside events
– Duck_dragon
Nov 15 '18 at 9:54
should I add return inside events
– Duck_dragon
Nov 15 '18 at 9:54
You want to return a generator yielding several strings? Put the loop inside
events– L3viathan
Nov 15 '18 at 9:59
You want to return a generator yielding several strings? Put the loop inside
events– L3viathan
Nov 15 '18 at 9:59
@L3viathan thanks got it.
– Duck_dragon
Nov 15 '18 at 10:04
@L3viathan thanks got it.
– Duck_dragon
Nov 15 '18 at 10:04
add a comment |
1 Answer
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I got it as @L3viathan pointed out I am returning after the first iteration only. What I need to return was the for loop inside my event function.
list111 = [1,2,3,4,5]
def events():
for i in list111:
print(i)
yield "data: %snn" % (i)
return Response(events(), content_type='text/event-stream')`
answered Nov 15 '18 at 10:04
Duck_dragonDuck_dragon
628
add a comment |
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1 Answer
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1 Answer
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active
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votes
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active
oldest
votes
I got it as @L3viathan pointed out I am returning after the first iteration only. What I need to return was the for loop inside my event function.
list111 = [1,2,3,4,5]
def events():
for i in list111:
print(i)
yield "data: %snn" % (i)
return Response(events(), content_type='text/event-stream')`
answered Nov 15 '18 at 10:04
Duck_dragonDuck_dragon
628
add a comment |
I got it as @L3viathan pointed out I am returning after the first iteration only. What I need to return was the for loop inside my event function.
list111 = [1,2,3,4,5]
def events():
for i in list111:
print(i)
yield "data: %snn" % (i)
return Response(events(), content_type='text/event-stream')`
answered Nov 15 '18 at 10:04
Duck_dragonDuck_dragon
628
add a comment |
I got it as @L3viathan pointed out I am returning after the first iteration only. What I need to return was the for loop inside my event function.
list111 = [1,2,3,4,5]
def events():
for i in list111:
print(i)
yield "data: %snn" % (i)
return Response(events(), content_type='text/event-stream')`
answered Nov 15 '18 at 10:04
Duck_dragonDuck_dragon
628
I got it as @L3viathan pointed out I am returning after the first iteration only. What I need to return was the for loop inside my event function.
list111 = [1,2,3,4,5]
def events():
for i in list111:
print(i)
yield "data: %snn" % (i)
return Response(events(), content_type='text/event-stream')`
answered Nov 15 '18 at 10:04
Duck_dragonDuck_dragon
628
answered Nov 15 '18 at 10:04
Duck_dragonDuck_dragon
628
answered Nov 15 '18 at 10:04
Duck_dragonDuck_dragon
628
answered Nov 15 '18 at 10:04
Duck_dragonDuck_dragon
628
628
add a comment |
add a comment |
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You return in the first iteration of the loop, so it only returns the
eventsgenerator yielding a single "data: 1nn".– L3viathan
Nov 15 '18 at 9:48
should I add return inside events
– Duck_dragon
Nov 15 '18 at 9:54
You want to return a generator yielding several strings? Put the loop inside
events– L3viathan
Nov 15 '18 at 9:59
@L3viathan thanks got it.
– Duck_dragon
Nov 15 '18 at 10:04