How to find specific value using generator in python
I created a generator that returns a tuple, for instance the name of an item and the price.
output = ('apple',$2)
I want to find the tuple when the price is the maximum, out of all outputs of the generator.
I know how to get the maximum of the second item when the tuple is not an output of the generator, but I don't know when the generator needs to be looped.
Should I append the looped outcomes and create a super list first? For instance, [('apple',$2),('pear',$1) ... ]
python python-3.x generator iterable
edited Nov 13 '18 at 17:42
jpp
96.1k2157109
asked Nov 13 '18 at 17:36
song0089song0089
87231235
add a comment |
I created a generator that returns a tuple, for instance the name of an item and the price.
output = ('apple',$2)
I want to find the tuple when the price is the maximum, out of all outputs of the generator.
I know how to get the maximum of the second item when the tuple is not an output of the generator, but I don't know when the generator needs to be looped.
Should I append the looped outcomes and create a super list first? For instance, [('apple',$2),('pear',$1) ... ]
python python-3.x generator iterable
edited Nov 13 '18 at 17:42
jpp
96.1k2157109
asked Nov 13 '18 at 17:36
song0089song0089
87231235
$2 is illegal python .. me thinks - either it is a string or a number w/o the $ sign
– Patrick Artner
Nov 13 '18 at 17:48
add a comment |
I created a generator that returns a tuple, for instance the name of an item and the price.
output = ('apple',$2)
I want to find the tuple when the price is the maximum, out of all outputs of the generator.
I know how to get the maximum of the second item when the tuple is not an output of the generator, but I don't know when the generator needs to be looped.
Should I append the looped outcomes and create a super list first? For instance, [('apple',$2),('pear',$1) ... ]
python python-3.x generator iterable
edited Nov 13 '18 at 17:42
jpp
96.1k2157109
asked Nov 13 '18 at 17:36
song0089song0089
87231235
I created a generator that returns a tuple, for instance the name of an item and the price.
output = ('apple',$2)
I want to find the tuple when the price is the maximum, out of all outputs of the generator.
I know how to get the maximum of the second item when the tuple is not an output of the generator, but I don't know when the generator needs to be looped.
Should I append the looped outcomes and create a super list first? For instance, [('apple',$2),('pear',$1) ... ]
python python-3.x generator iterable
python python-3.x generator iterable
edited Nov 13 '18 at 17:42
jpp
96.1k2157109
asked Nov 13 '18 at 17:36
song0089song0089
87231235
edited Nov 13 '18 at 17:42
jpp
96.1k2157109
asked Nov 13 '18 at 17:36
song0089song0089
87231235
edited Nov 13 '18 at 17:42
jpp
96.1k2157109
edited Nov 13 '18 at 17:42
jpp
96.1k2157109
edited Nov 13 '18 at 17:42
jpp
96.1k2157109
96.1k2157109
asked Nov 13 '18 at 17:36
song0089song0089
87231235
asked Nov 13 '18 at 17:36
song0089song0089
87231235
asked Nov 13 '18 at 17:36
song0089song0089
87231235
87231235
$2 is illegal python .. me thinks - either it is a string or a number w/o the $ sign
– Patrick Artner
Nov 13 '18 at 17:48
add a comment |
$2 is illegal python .. me thinks - either it is a string or a number w/o the $ sign
– Patrick Artner
Nov 13 '18 at 17:48
$2 is illegal python .. me thinks - either it is a string or a number w/o the $ sign
– Patrick Artner
Nov 13 '18 at 17:48
$2 is illegal python .. me thinks - either it is a string or a number w/o the $ sign
– Patrick Artner
Nov 13 '18 at 17:48
add a comment |
1 Answer
1
active
oldest
votes
max accepts any iterable. A generator is an iterable. You can supply a custom key function so that max considers only the 1st index:
from operator import itemgetter
# generator expression below can also be a generator function
gen = (i for i in (('apple', 2), ('pear', 1)))
res = max(gen, key=itemgetter(1)) # ('apple', 2)
answered Nov 13 '18 at 17:40
jppjpp
96.1k2157109
That works iftup[1]is anint, otherwise a custom function to cast as int is needed
– Dalvenjia
Nov 13 '18 at 18:01
@Dalvenjia, Agreed, in that case, you can uselambda x: int(x[1])(if it's a string).
– jpp
Nov 13 '18 at 18:02
orlambda x: int(x[1].strip('$'))if the amount is in dollars as stated in the question
– Dalvenjia
Nov 13 '18 at 18:04
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
max accepts any iterable. A generator is an iterable. You can supply a custom key function so that max considers only the 1st index:
from operator import itemgetter
# generator expression below can also be a generator function
gen = (i for i in (('apple', 2), ('pear', 1)))
res = max(gen, key=itemgetter(1)) # ('apple', 2)
answered Nov 13 '18 at 17:40
jppjpp
96.1k2157109
That works iftup[1]is anint, otherwise a custom function to cast as int is needed
– Dalvenjia
Nov 13 '18 at 18:01
@Dalvenjia, Agreed, in that case, you can uselambda x: int(x[1])(if it's a string).
– jpp
Nov 13 '18 at 18:02
orlambda x: int(x[1].strip('$'))if the amount is in dollars as stated in the question
– Dalvenjia
Nov 13 '18 at 18:04
add a comment |
max accepts any iterable. A generator is an iterable. You can supply a custom key function so that max considers only the 1st index:
from operator import itemgetter
# generator expression below can also be a generator function
gen = (i for i in (('apple', 2), ('pear', 1)))
res = max(gen, key=itemgetter(1)) # ('apple', 2)
answered Nov 13 '18 at 17:40
jppjpp
96.1k2157109
That works iftup[1]is anint, otherwise a custom function to cast as int is needed
– Dalvenjia
Nov 13 '18 at 18:01
@Dalvenjia, Agreed, in that case, you can uselambda x: int(x[1])(if it's a string).
– jpp
Nov 13 '18 at 18:02
orlambda x: int(x[1].strip('$'))if the amount is in dollars as stated in the question
– Dalvenjia
Nov 13 '18 at 18:04
add a comment |
max accepts any iterable. A generator is an iterable. You can supply a custom key function so that max considers only the 1st index:
from operator import itemgetter
# generator expression below can also be a generator function
gen = (i for i in (('apple', 2), ('pear', 1)))
res = max(gen, key=itemgetter(1)) # ('apple', 2)
answered Nov 13 '18 at 17:40
jppjpp
96.1k2157109
max accepts any iterable. A generator is an iterable. You can supply a custom key function so that max considers only the 1st index:
from operator import itemgetter
# generator expression below can also be a generator function
gen = (i for i in (('apple', 2), ('pear', 1)))
res = max(gen, key=itemgetter(1)) # ('apple', 2)
answered Nov 13 '18 at 17:40
jppjpp
96.1k2157109
edited Nov 13 '18 at 17:48
answered Nov 13 '18 at 17:40
jppjpp
96.1k2157109
answered Nov 13 '18 at 17:40
jppjpp
96.1k2157109
answered Nov 13 '18 at 17:40
jppjpp
96.1k2157109
96.1k2157109
That works iftup[1]is anint, otherwise a custom function to cast as int is needed
– Dalvenjia
Nov 13 '18 at 18:01
@Dalvenjia, Agreed, in that case, you can uselambda x: int(x[1])(if it's a string).
– jpp
Nov 13 '18 at 18:02
orlambda x: int(x[1].strip('$'))if the amount is in dollars as stated in the question
– Dalvenjia
Nov 13 '18 at 18:04
add a comment |
That works iftup[1]is anint, otherwise a custom function to cast as int is needed
– Dalvenjia
Nov 13 '18 at 18:01
@Dalvenjia, Agreed, in that case, you can uselambda x: int(x[1])(if it's a string).
– jpp
Nov 13 '18 at 18:02
orlambda x: int(x[1].strip('$'))if the amount is in dollars as stated in the question
– Dalvenjia
Nov 13 '18 at 18:04
That works if
tup[1] is an int, otherwise a custom function to cast as int is needed– Dalvenjia
Nov 13 '18 at 18:01
That works if
tup[1] is an int, otherwise a custom function to cast as int is needed– Dalvenjia
Nov 13 '18 at 18:01
@Dalvenjia, Agreed, in that case, you can use
lambda x: int(x[1]) (if it's a string).– jpp
Nov 13 '18 at 18:02
@Dalvenjia, Agreed, in that case, you can use
lambda x: int(x[1]) (if it's a string).– jpp
Nov 13 '18 at 18:02
or
lambda x: int(x[1].strip('$')) if the amount is in dollars as stated in the question– Dalvenjia
Nov 13 '18 at 18:04
or
lambda x: int(x[1].strip('$')) if the amount is in dollars as stated in the question– Dalvenjia
Nov 13 '18 at 18:04
add a comment |
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$2 is illegal python .. me thinks - either it is a string or a number w/o the $ sign
– Patrick Artner
Nov 13 '18 at 17:48