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Is it possible to use a operator map to auto generate a specified operator?
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
The Ask Question Wizard is Live!
Data science time! April 2019 and salary with experienceHow do I efficiently iterate over each entry in a Java Map?Sort a Map<Key, Value> by valuesWhich equals operator (== vs ===) should be used in JavaScript comparisons?Does Python have a ternary conditional operator?Is there a “null coalescing” operator in JavaScript?What is the !! (not not) operator in JavaScript?What is the “-->” operator in C++?What are the basic rules and idioms for operator overloading?What does the C ??!??! operator do?Why don't Java's +=, -=, *=, /= compound assignment operators require casting?
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For I have some rules saved in mysql db.
+----+---------+-------+----------+-------+-------+
| id | rule_id | field | operator | value | order |
+----+---------+-------+----------+-------+-------+
| 1 | 1 | 5 | 2 | 8 | 1 |
| 2 | 1 | 10 | 2 | 2 | 2 |
| 3 | 1 | 4 | 2 | 1 | 3 |
...
# operator 2 is equal to GREATER_THAN for example
Then I want to filter data list using the related rule operator, as below's code showed
operator = "LESS_THAN" # get from mysql db
target_value = 8
list1 = ['clicks':5, "views":7, 'id':1234, 'clicks':5, "views":9, 'id':1235]
filtered_list = [i['id'] for i in filter(lambda item: item['views'] > target_value, list1)]
# filter the list according to operator > ,target_value 8 for example.
Is it possible to use a map relationship like
operation_map =
"LESS_THAN" : <,
"GREATER_THAN": >,
"EQUAL":=
to make something like below happed instead of if operator == 'GREATER_THAN' : pass syntax?
filtered_list = [i['id'] for i in filter(lambda item: item['views'] operation_map[operator] target_value, list1)]
Any help or insight would be greatly appreciated, great thanks.
python dictionary operators
asked Mar 22 at 7:46
jia Jimmyjia Jimmy
453316
add a comment |
For I have some rules saved in mysql db.
+----+---------+-------+----------+-------+-------+
| id | rule_id | field | operator | value | order |
+----+---------+-------+----------+-------+-------+
| 1 | 1 | 5 | 2 | 8 | 1 |
| 2 | 1 | 10 | 2 | 2 | 2 |
| 3 | 1 | 4 | 2 | 1 | 3 |
...
# operator 2 is equal to GREATER_THAN for example
Then I want to filter data list using the related rule operator, as below's code showed
operator = "LESS_THAN" # get from mysql db
target_value = 8
list1 = ['clicks':5, "views":7, 'id':1234, 'clicks':5, "views":9, 'id':1235]
filtered_list = [i['id'] for i in filter(lambda item: item['views'] > target_value, list1)]
# filter the list according to operator > ,target_value 8 for example.
Is it possible to use a map relationship like
operation_map =
"LESS_THAN" : <,
"GREATER_THAN": >,
"EQUAL":=
to make something like below happed instead of if operator == 'GREATER_THAN' : pass syntax?
filtered_list = [i['id'] for i in filter(lambda item: item['views'] operation_map[operator] target_value, list1)]
Any help or insight would be greatly appreciated, great thanks.
python dictionary operators
asked Mar 22 at 7:46
jia Jimmyjia Jimmy
453316
Why would you want to do that? operators are more readable and if your class objects have implemented them you can use just a lambda function to sort them.
– Farhood ET
Mar 22 at 7:54
add a comment |
For I have some rules saved in mysql db.
+----+---------+-------+----------+-------+-------+
| id | rule_id | field | operator | value | order |
+----+---------+-------+----------+-------+-------+
| 1 | 1 | 5 | 2 | 8 | 1 |
| 2 | 1 | 10 | 2 | 2 | 2 |
| 3 | 1 | 4 | 2 | 1 | 3 |
...
# operator 2 is equal to GREATER_THAN for example
Then I want to filter data list using the related rule operator, as below's code showed
operator = "LESS_THAN" # get from mysql db
target_value = 8
list1 = ['clicks':5, "views":7, 'id':1234, 'clicks':5, "views":9, 'id':1235]
filtered_list = [i['id'] for i in filter(lambda item: item['views'] > target_value, list1)]
# filter the list according to operator > ,target_value 8 for example.
Is it possible to use a map relationship like
operation_map =
"LESS_THAN" : <,
"GREATER_THAN": >,
"EQUAL":=
to make something like below happed instead of if operator == 'GREATER_THAN' : pass syntax?
filtered_list = [i['id'] for i in filter(lambda item: item['views'] operation_map[operator] target_value, list1)]
Any help or insight would be greatly appreciated, great thanks.
python dictionary operators
asked Mar 22 at 7:46
jia Jimmyjia Jimmy
453316
For I have some rules saved in mysql db.
+----+---------+-------+----------+-------+-------+
| id | rule_id | field | operator | value | order |
+----+---------+-------+----------+-------+-------+
| 1 | 1 | 5 | 2 | 8 | 1 |
| 2 | 1 | 10 | 2 | 2 | 2 |
| 3 | 1 | 4 | 2 | 1 | 3 |
...
# operator 2 is equal to GREATER_THAN for example
Then I want to filter data list using the related rule operator, as below's code showed
operator = "LESS_THAN" # get from mysql db
target_value = 8
list1 = ['clicks':5, "views":7, 'id':1234, 'clicks':5, "views":9, 'id':1235]
filtered_list = [i['id'] for i in filter(lambda item: item['views'] > target_value, list1)]
# filter the list according to operator > ,target_value 8 for example.
Is it possible to use a map relationship like
operation_map =
"LESS_THAN" : <,
"GREATER_THAN": >,
"EQUAL":=
to make something like below happed instead of if operator == 'GREATER_THAN' : pass syntax?
filtered_list = [i['id'] for i in filter(lambda item: item['views'] operation_map[operator] target_value, list1)]
Any help or insight would be greatly appreciated, great thanks.
python dictionary operators
python dictionary operators
asked Mar 22 at 7:46
jia Jimmyjia Jimmy
453316
asked Mar 22 at 7:46
jia Jimmyjia Jimmy
453316
asked Mar 22 at 7:46
jia Jimmyjia Jimmy
453316
asked Mar 22 at 7:46
jia Jimmyjia Jimmy
453316
asked Mar 22 at 7:46
jia Jimmyjia Jimmy
453316
453316
Why would you want to do that? operators are more readable and if your class objects have implemented them you can use just a lambda function to sort them.
– Farhood ET
Mar 22 at 7:54
add a comment |
Why would you want to do that? operators are more readable and if your class objects have implemented them you can use just a lambda function to sort them.
– Farhood ET
Mar 22 at 7:54
Why would you want to do that? operators are more readable and if your class objects have implemented them you can use just a lambda function to sort them.
– Farhood ET
Mar 22 at 7:54
Why would you want to do that? operators are more readable and if your class objects have implemented them you can use just a lambda function to sort them.
– Farhood ET
Mar 22 at 7:54
add a comment |
1 Answer
1
active
oldest
votes
Use the operator module:
import operator
operator_map = 'LESS_THAN': operator.lt,
'GREATER_THAN': operator.gt,
'EQUAL': operator.eq
filtered_list = [i['id'] for i in filter(lambda item: operator_map[operator](item['views'], target_value), list1)]
Add other operators as necessary.
answered Mar 22 at 7:55
gmdsgmds
6,151525
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
Use the operator module:
import operator
operator_map = 'LESS_THAN': operator.lt,
'GREATER_THAN': operator.gt,
'EQUAL': operator.eq
filtered_list = [i['id'] for i in filter(lambda item: operator_map[operator](item['views'], target_value), list1)]
Add other operators as necessary.
answered Mar 22 at 7:55
gmdsgmds
6,151525
add a comment |
Use the operator module:
import operator
operator_map = 'LESS_THAN': operator.lt,
'GREATER_THAN': operator.gt,
'EQUAL': operator.eq
filtered_list = [i['id'] for i in filter(lambda item: operator_map[operator](item['views'], target_value), list1)]
Add other operators as necessary.
answered Mar 22 at 7:55
gmdsgmds
6,151525
add a comment |
Use the operator module:
import operator
operator_map = 'LESS_THAN': operator.lt,
'GREATER_THAN': operator.gt,
'EQUAL': operator.eq
filtered_list = [i['id'] for i in filter(lambda item: operator_map[operator](item['views'], target_value), list1)]
Add other operators as necessary.
answered Mar 22 at 7:55
gmdsgmds
6,151525
Use the operator module:
import operator
operator_map = 'LESS_THAN': operator.lt,
'GREATER_THAN': operator.gt,
'EQUAL': operator.eq
filtered_list = [i['id'] for i in filter(lambda item: operator_map[operator](item['views'], target_value), list1)]
Add other operators as necessary.
answered Mar 22 at 7:55
gmdsgmds
6,151525
answered Mar 22 at 7:55
gmdsgmds
6,151525
answered Mar 22 at 7:55
gmdsgmds
6,151525
answered Mar 22 at 7:55
gmdsgmds
6,151525
6,151525
add a comment |
add a comment |
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Why would you want to do that? operators are more readable and if your class objects have implemented them you can use just a lambda function to sort them.
– Farhood ET
Mar 22 at 7:54